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Wikipedia

Brake

January 19, 2023

This article is about the vehicle component. For other uses, see Brake (disambiguation).
Not to be confused with Break.

A brake is a mechanical device that inhibits motion by absorbing energy from a moving system.[1] It is used for slowing or stopping a moving vehicle, wheel, axle, or to prevent its motion, most often accomplished by means of friction.[2]

Background

Most brakes commonly use friction between two surfaces pressed together to convert the kinetic energy of the moving object into heat, though other methods of energy conversion may be employed. For example, regenerative braking converts much of the energy to electrical energy, which may be stored for later use. Other methods convert kinetic energy into potential energy in such stored forms as pressurized air or pressurized oil. Eddy current brakes use magnetic fields to convert kinetic energy into electric current in the brake disc, fin, or rail, which is converted into heat. Still other braking methods even transform kinetic energy into different forms, for example by transferring the energy to a rotating flywheel.

Brakes are generally applied to rotating axles or wheels, but may also take other forms such as the surface of a moving fluid (flaps deployed into water or air). Some vehicles use a combination of braking mechanisms, such as drag racing cars with both wheel brakes and a parachute, or airplanes with both wheel brakes and drag flaps raised into the air during landing.

Since kinetic energy increases quadratically with velocity ( ), an object moving at 10 m/s has 100 times as much energy as one of the same mass moving at 1 m/s, and consequently the theoretical braking distance, when braking at the traction limit, is up to 100 times as long. In practice, fast vehicles usually have significant air drag, and energy lost to air drag rises quickly with speed.

Almost all wheeled vehicles have a brake of some sort. Even baggage carts and shopping carts may have them for use on a moving ramp. Most fixed-wing aircraft are fitted with wheel brakes on the undercarriage. Some aircraft also feature air brakes designed to reduce their speed in flight. Notable examples include gliders and some World War II-era aircraft, primarily some fighter aircraft and many dive bombers of the era. These allow the aircraft to maintain a safe speed in a steep descent. The Saab B 17 dive bomber and Vought F4U Corsair fighter used the deployed undercarriage as an air brake.

Friction brakes on automobiles store braking heat in the drum brake or disc brake while braking then conduct it to the air gradually. When traveling downhill some vehicles can use their engines to brake.

When the brake pedal of a modern vehicle with hydraulic brakes is pushed against the master cylinder, ultimately a piston pushes the brake pad against the brake disc which slows the wheel down. On the brake drum it is similar as the cylinder pushes the brake shoes against the drum which also slows the wheel down.

Types

 
Rendering of a drum brake
 
Single pivot side-pull bicycle caliper brake

Brakes may be broadly described as using friction, pumping, or electromagnetics. One brake may use several principles: for example, a pump may pass fluid through an orifice to create friction:

Frictional

 
typical braking system for cars:
FAD: Brake disc front
FPD: Brake disc rear
FPT: Rear brake drum
CF: Brake control
SF: servo brake
PF: Brake Pump
SLF: Brake Fluid Reservoir
RF: Splitter braking
FS: Parking Brake

Frictional brakes are most common and can be divided broadly into "shoe" or "pad" brakes, using an explicit wear surface, and hydrodynamic brakes, such as parachutes, which use friction in a working fluid and do not explicitly wear. Typically the term "friction brake" is used to mean pad/shoe brakes and excludes hydrodynamic brakes, even though hydrodynamic brakes use friction. Friction (pad/shoe) brakes are often rotating devices with a stationary pad and a rotating wear surface. Common configurations include shoes that contract to rub on the outside of a rotating drum, such as a band brake; a rotating drum with shoes that expand to rub the inside of a drum, commonly called a "drum brake", although other drum configurations are possible; and pads that pinch a rotating disc, commonly called a "disc brake". Other brake configurations are used, but less often. For example, PCC trolley brakes include a flat shoe which is clamped to the rail with an electromagnet; the Murphy brake pinches a rotating drum, and the Ausco Lambert disc brake uses a hollow disc (two parallel discs with a structural bridge) with shoes that sit between the disc surfaces and expand laterally.

A drum brake is a vehicle brake in which the friction is caused by a set of brake shoes that press against the inner surface of a rotating drum. The drum is connected to the rotating roadwheel hub.

Drum brakes generally can be found on older car and truck models. However, because of their low production cost, drum brake setups are also installed on the rear of some low-cost newer vehicles. Compared to modern disc brakes, drum brakes wear out faster due to their tendency to overheat.

The disc brake is a device for slowing or stopping the rotation of a road wheel. A brake disc (or rotor in U.S. English), usually made of cast iron or ceramic, is connected to the wheel or the axle. To stop the wheel, friction material in the form of brake pads (mounted in a device called a brake caliper) is forced mechanically, hydraulically, pneumatically or electromagnetically against both sides of the disc. Friction causes the disc and attached wheel to slow or stop.

Pumping

Pumping brakes are often used where a pump is already part of the machinery. For example, an internal-combustion piston motor can have the fuel supply stopped, and then internal pumping losses of the engine create some braking. Some engines use a valve override called a Jake brake to greatly increase pumping losses. Pumping brakes can dump energy as heat, or can be regenerative brakes that recharge a pressure reservoir called a hydraulic accumulator.

Electromagnetic

Main article: Electromagnetic brake

Electromagnetic brakes are likewise often used where an electric motor is already part of the machinery. For example, many hybrid gasoline/electric vehicles use the electric motor as a generator to charge electric batteries and also as a regenerative brake. Some diesel/electric railroad locomotives use the electric motors to generate electricity which is then sent to a resistor bank and dumped as heat. Some vehicles, such as some transit buses, do not already have an electric motor but use a secondary "retarder" brake that is effectively a generator with an internal short circuit. Related types of such a brake are eddy current brakes, and electro-mechanical brakes (which actually are magnetically driven friction brakes, but nowadays are often just called "electromagnetic brakes" as well).

Electromagnetic brakes slow an object through electromagnetic induction, which creates resistance and in turn either heat or electricity. Friction brakes apply pressure on two separate objects to slow the vehicle in a controlled manner.

Characteristics

Brakes are often described according to several characteristics including:

  • Peak force – The peak force is the maximum decelerating effect that can be obtained. The peak force is often greater than the traction limit of the tires, in which case the brake can cause a wheel skid.
  • Continuous power dissipation – Brakes typically get hot in use and fail when the temperature gets too high. The greatest amount of power (energy per unit time) that can be dissipated through the brake without failure is the continuous power dissipation. Continuous power dissipation often depends on e.g., the temperature and speed of ambient cooling air.
  • Fade – As a brake heats, it may become less effective, called brake fade. Some designs are inherently prone to fade, while other designs are relatively immune. Further, use considerations, such as cooling, often have a big effect on fade.
  • Smoothness – A brake that is grabby, pulses, has chatter, or otherwise exerts varying brake force may lead to skids. For example, railroad wheels have little traction, and friction brakes without an anti-skid mechanism often lead to skids, which increases maintenance costs and leads to a "thump thump" feeling for riders inside.
  • Power – Brakes are often described as "powerful" when a small human application force leads to a braking force that is higher than typical for other brakes in the same class. This notion of "powerful" does not relate to continuous power dissipation, and may be confusing in that a brake may be "powerful" and brake strongly with a gentle brake application, yet have lower (worse) peak force than a less "powerful" brake.
  • Pedal feel – Brake pedal feel encompasses subjective perception of brake power output as a function of pedal travel. Pedal travel is influenced by the fluid displacement of the brake and other factors.
  • Drag – Brakes have varied amount of drag in the off-brake condition depending on design of the system to accommodate total system compliance and deformation that exists under braking with ability to retract friction material from the rubbing surface in the off-brake condition.
  • Durability – Friction brakes have wear surfaces that must be renewed periodically. Wear surfaces include the brake shoes or pads, and also the brake disc or drum. There may be tradeoffs, for example, a wear surface that generates high peak force may also wear quickly.
  • Weight – Brakes are often "added weight" in that they serve no other function. Further, brakes are often mounted on wheels, and unsprung weight can significantly hurt traction in some circumstances. "Weight" may mean the brake itself, or may include additional support structure.
  • Noise – Brakes usually create some minor noise when applied, but often create squeal or grinding noises that are quite loud.

Foundation components

Foundation components are the brake-assembly components at the wheels of a vehicle, named for forming the basis of the rest of the brake system. These mechanical parts contained around the wheels are controlled by the air brake system.

The three types of foundation brake systems are “S” cam brakes, disc brakes and wedge brakes.[3]

Brake boost

 
Brake booster from a Geo Storm.

Most modern passenger vehicles, and light vans, use a vacuum assisted brake system that greatly increases the force applied to the vehicle's brakes by its operator.[4] This additional force is supplied by the manifold vacuum generated by air flow being obstructed by the throttle on a running engine. This force is greatly reduced when the engine is running at fully open throttle, as the difference between ambient air pressure and manifold (absolute) air pressure is reduced, and therefore available vacuum is diminished. However, brakes are rarely applied at full throttle; the driver takes the right foot off the gas pedal and moves it to the brake pedal - unless left-foot braking is used.

Because of low vacuum at high RPM, reports of unintended acceleration are often accompanied by complaints of failed or weakened brakes, as the high-revving engine, having an open throttle, is unable to provide enough vacuum to power the brake booster. This problem is exacerbated in vehicles equipped with automatic transmissions as the vehicle will automatically downshift upon application of the brakes, thereby increasing the torque delivered to the driven-wheels in contact with the road surface.

Heavier road vehicles, as well as trains, usually boost brake power with compressed air, supplied by one or more compressors.

Noise

 
Brake lever on a horse-drawn hearse
Main article: Roadway noise

Although ideally a brake would convert all the kinetic energy into heat, in practice a significant amount may be converted into acoustic energy instead, contributing to noise pollution.

For road vehicles, the noise produced varies significantly with tire construction, road surface, and the magnitude of the deceleration.[5] Noise can be caused by different things. These are signs that there may be issues with brakes wearing out over time.

Fires

Railway brake malfunctions can produce sparks and cause forest fires.[6] In some very extreme cases, disc brakes can become red hot and set on fire. This happened in the Tuscan GP, when the Mercedes car, the W11 had its front carbon disc brakes almost bursting into flames, due to low ventilation and high usage.[7] These fires can also occur on some Mercedes Sprinter vans, when the load adjusting sensor seizes up and the rear brakes have to compensate for the fronts.[8]

Inefficiency

A significant amount of energy is always lost while braking, even with regenerative braking which is not perfectly efficient. Therefore, a good metric of efficient energy use while driving is to note how much one is braking. If the majority of deceleration is from unavoidable friction instead of braking, one is squeezing out most of the service from the vehicle. Minimizing brake use is one of the fuel economy-maximizing behaviors.

While energy is always lost during a brake event, a secondary factor that influences efficiency is "off-brake drag", or drag that occurs when the brake is not intentionally actuated. After a braking event, hydraulic pressure drops in the system, allowing the brake caliper pistons to retract. However, this retraction must accommodate all compliance in the system (under pressure) as well as thermal distortion of components like the brake disc or the brake system will drag until the contact with the disc, for example, knocks the pads and pistons back from the rubbing surface. During this time, there can be significant brake drag. This brake drag can lead to significant parasitic power loss, thus impacting fuel economy and overall vehicle performance.

History

Early brake system

In the 1890s, Wooden block brakes became obsolete when Michelin brothers introduced rubber tires.[9]

During the 1960s, some car manufacturers replaced drum brakes with disc brakes.[10]

Electronic brake system

In 1966, the ABS was fitted in the Jensen FF grand tourer.[11]

In 1978, Bosch and Mercedes updated their 1936 anti-lock brake system for the Mercedes S-Class. That ABS is a fully electronic, four-wheel and multi-channel system that later became standard.[12]

In 2005, ESC — which automatically applies the brakes to avoid a loss of steering control — become compulsory for carriers of dangerous goods without data recorders in the Canadian province of Quebec.[13]

Since 2017, numerous United Nations Economic Commission for Europe (UNECE) countries use Brake Assist System (BAS) a function of the braking system that deduces an emergency braking event from a characteristic of the driver's brake demand and under such conditions assist the driver to improve braking.[14]

In July 2013[15] UNECE vehicle regulation 131 was enacted. This regulation defines Advanced Emergency Braking Systems (AEBS) for heavy vehicles to automatically detect a potential forward collision and activate the vehicle braking system.

On 23 January 2020[16] UNECE vehicle regulation 152 was enacted, defining Advanced Emergency Braking Systems for light vehicles.

From May 2022, in the European Union, by law, new vehicles will have advanced emergency-braking system.[17]

See also

References

  1. ^ Bhandari, V.B. (2010). Design of machine elements. Tata McGraw-Hill. p. 472. ISBN 9780070681798. Retrieved 9 February 2016.
  2. ^ "Definition of brake". The Collins English Dictionary. Retrieved 9 February 2016.
  3. ^ "Foundation Brakes". ontario.ca. Retrieved 2017-07-22.
  4. ^ Nice, Karim (2000-08-22). "How Power Brakes Work". Howstuffworks.com. Retrieved 2011-03-12.
  5. ^ C.Michael Hogan, Analysis of highway noise, Journal of Water, Air, & Soil Pollution, Volume 2, Number 3, Biomedical and Life Sciences and Earth and Environmental Science Issue, Pages 387-392, September, 1973, Springer Verlag, Netherlands ISSN 0049-6979
  6. ^ David Hench (May 8, 2014). "Train-sparked fires cause explosions, destroy trailers, force evacuations". Portland Press Herald.
  7. ^ "Mercedes explains Hamilton brake fire on Mugello F1 grid". www.motorsport.com. Retrieved 2020-11-21.
  8. ^ "Sprinter 311 Rear Brakes on fire". Mercedes-Benz Owners' Forums. Retrieved 2020-11-21.
  9. ^ "The History of Brakes | Did You Know Cars". 28 August 2017.
  10. ^ "The History of Brakes | Did You Know Cars". 28 August 2017.
  11. ^ "The History of Brakes | Did You Know Cars". 28 August 2017.
  12. ^ "The History of Brakes | Did You Know Cars". 28 August 2017.
  13. ^ Roll Stability Control system (RSC) 2011-07-16 at the Wayback Machine
  14. ^ https://www.unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/2020/ECE-TRANS-WP.29-343-Rev.28-Add.1.pdf[bare URL PDF]
  15. ^ https://www.unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/2020/ECE-TRANS-WP.29-343-Rev.28-Add.1.pdf[bare URL PDF]
  16. ^ https://www.unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/2020/ECE-TRANS-WP.29-343-Rev.28-Add.1.pdf[bare URL PDF]
  17. ^ "Parliament approves EU rules requiring life-saving technologies in vehicles | News | European Parliament". Europarl.europa.eu. 2019-04-16. Retrieved 2020-08-31.

External links

 
Look up brake in Wiktionary, the free dictionary.
  • How Stuff Works - Brakes

January 19, 2023
brake, this, article, about, vehicle, component, other, uses, disambiguation, confused, with, break, brake, mechanical, device, that, inhibits, motion, absorbing, energy, from, moving, system, used, slowing, stopping, moving, vehicle, wheel, axle, prevent, mot. This article is about the vehicle component For other uses see Brake disambiguation Not to be confused with Break A brake is a mechanical device that inhibits motion by absorbing energy from a moving system 1 It is used for slowing or stopping a moving vehicle wheel axle or to prevent its motion most often accomplished by means of friction 2 Disc brake on a motorcycle Contents 1 Background 2 Types 2 1 Frictional 2 2 Pumping 2 3 Electromagnetic 3 Characteristics 3 1 Foundation components 3 2 Brake boost 4 Noise 5 Fires 6 Inefficiency 7 History 7 1 Early brake system 7 2 Electronic brake system 8 See also 9 References 10 External linksBackground EditThis section needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed February 2016 Learn how and when to remove this template message Most brakes commonly use friction between two surfaces pressed together to convert the kinetic energy of the moving object into heat though other methods of energy conversion may be employed For example regenerative braking converts much of the energy to electrical energy which may be stored for later use Other methods convert kinetic energy into potential energy in such stored forms as pressurized air or pressurized oil Eddy current brakes use magnetic fields to convert kinetic energy into electric current in the brake disc fin or rail which is converted into heat Still other braking methods even transform kinetic energy into different forms for example by transferring the energy to a rotating flywheel Brakes are generally applied to rotating axles or wheels but may also take other forms such as the surface of a moving fluid flaps deployed into water or air Some vehicles use a combination of braking mechanisms such as drag racing cars with both wheel brakes and a parachute or airplanes with both wheel brakes and drag flaps raised into the air during landing Since kinetic energy increases quadratically with velocity K m v 2 2 displaystyle K mv 2 2 an object moving at 10 m s has 100 times as much energy as one of the same mass moving at 1 m s and consequently the theoretical braking distance when braking at the traction limit is up to 100 times as long In practice fast vehicles usually have significant air drag and energy lost to air drag rises quickly with speed Almost all wheeled vehicles have a brake of some sort Even baggage carts and shopping carts may have them for use on a moving ramp Most fixed wing aircraft are fitted with wheel brakes on the undercarriage Some aircraft also feature air brakes designed to reduce their speed in flight Notable examples include gliders and some World War II era aircraft primarily some fighter aircraft and many dive bombers of the era These allow the aircraft to maintain a safe speed in a steep descent The Saab B 17 dive bomber and Vought F4U Corsair fighter used the deployed undercarriage as an air brake Friction brakes on automobiles store braking heat in the drum brake or disc brake while braking then conduct it to the air gradually When traveling downhill some vehicles can use their engines to brake When the brake pedal of a modern vehicle with hydraulic brakes is pushed against the master cylinder ultimately a piston pushes the brake pad against the brake disc which slows the wheel down On the brake drum it is similar as the cylinder pushes the brake shoes against the drum which also slows the wheel down Types Edit Rendering of a drum brake Single pivot side pull bicycle caliper brake Brakes may be broadly described as using friction pumping or electromagnetics One brake may use several principles for example a pump may pass fluid through an orifice to create friction Frictional Edit typical braking system for cars FAD Brake disc front FPD Brake disc rear FPT Rear brake drum CF Brake control SF servo brake PF Brake Pump SLF Brake Fluid Reservoir RF Splitter braking FS Parking Brake Frictional brakes are most common and can be divided broadly into shoe or pad brakes using an explicit wear surface and hydrodynamic brakes such as parachutes which use friction in a working fluid and do not explicitly wear Typically the term friction brake is used to mean pad shoe brakes and excludes hydrodynamic brakes even though hydrodynamic brakes use friction Friction pad shoe brakes are often rotating devices with a stationary pad and a rotating wear surface Common configurations include shoes that contract to rub on the outside of a rotating drum such as a band brake a rotating drum with shoes that expand to rub the inside of a drum commonly called a drum brake although other drum configurations are possible and pads that pinch a rotating disc commonly called a disc brake Other brake configurations are used but less often For example PCC trolley brakes include a flat shoe which is clamped to the rail with an electromagnet the Murphy brake pinches a rotating drum and the Ausco Lambert disc brake uses a hollow disc two parallel discs with a structural bridge with shoes that sit between the disc surfaces and expand laterally A drum brake is a vehicle brake in which the friction is caused by a set of brake shoes that press against the inner surface of a rotating drum The drum is connected to the rotating roadwheel hub Drum brakes generally can be found on older car and truck models However because of their low production cost drum brake setups are also installed on the rear of some low cost newer vehicles Compared to modern disc brakes drum brakes wear out faster due to their tendency to overheat The disc brake is a device for slowing or stopping the rotation of a road wheel A brake disc or rotor in U S English usually made of cast iron or ceramic is connected to the wheel or the axle To stop the wheel friction material in the form of brake pads mounted in a device called a brake caliper is forced mechanically hydraulically pneumatically or electromagnetically against both sides of the disc Friction causes the disc and attached wheel to slow or stop Pumping Edit Pumping brakes are often used where a pump is already part of the machinery For example an internal combustion piston motor can have the fuel supply stopped and then internal pumping losses of the engine create some braking Some engines use a valve override called a Jake brake to greatly increase pumping losses Pumping brakes can dump energy as heat or can be regenerative brakes that recharge a pressure reservoir called a hydraulic accumulator Electromagnetic Edit Main article Electromagnetic brake Electromagnetic brakes are likewise often used where an electric motor is already part of the machinery For example many hybrid gasoline electric vehicles use the electric motor as a generator to charge electric batteries and also as a regenerative brake Some diesel electric railroad locomotives use the electric motors to generate electricity which is then sent to a resistor bank and dumped as heat Some vehicles such as some transit buses do not already have an electric motor but use a secondary retarder brake that is effectively a generator with an internal short circuit Related types of such a brake are eddy current brakes and electro mechanical brakes which actually are magnetically driven friction brakes but nowadays are often just called electromagnetic brakes as well Electromagnetic brakes slow an object through electromagnetic induction which creates resistance and in turn either heat or electricity Friction brakes apply pressure on two separate objects to slow the vehicle in a controlled manner Characteristics EditBrakes are often described according to several characteristics including Peak force The peak force is the maximum decelerating effect that can be obtained The peak force is often greater than the traction limit of the tires in which case the brake can cause a wheel skid Continuous power dissipation Brakes typically get hot in use and fail when the temperature gets too high The greatest amount of power energy per unit time that can be dissipated through the brake without failure is the continuous power dissipation Continuous power dissipation often depends on e g the temperature and speed of ambient cooling air Fade As a brake heats it may become less effective called brake fade Some designs are inherently prone to fade while other designs are relatively immune Further use considerations such as cooling often have a big effect on fade Smoothness A brake that is grabby pulses has chatter or otherwise exerts varying brake force may lead to skids For example railroad wheels have little traction and friction brakes without an anti skid mechanism often lead to skids which increases maintenance costs and leads to a thump thump feeling for riders inside Power Brakes are often described as powerful when a small human application force leads to a braking force that is higher than typical for other brakes in the same class This notion of powerful does not relate to continuous power dissipation and may be confusing in that a brake may be powerful and brake strongly with a gentle brake application yet have lower worse peak force than a less powerful brake Pedal feel Brake pedal feel encompasses subjective perception of brake power output as a function of pedal travel Pedal travel is influenced by the fluid displacement of the brake and other factors Drag Brakes have varied amount of drag in the off brake condition depending on design of the system to accommodate total system compliance and deformation that exists under braking with ability to retract friction material from the rubbing surface in the off brake condition Durability Friction brakes have wear surfaces that must be renewed periodically Wear surfaces include the brake shoes or pads and also the brake disc or drum There may be tradeoffs for example a wear surface that generates high peak force may also wear quickly Weight Brakes are often added weight in that they serve no other function Further brakes are often mounted on wheels and unsprung weight can significantly hurt traction in some circumstances Weight may mean the brake itself or may include additional support structure Noise Brakes usually create some minor noise when applied but often create squeal or grinding noises that are quite loud Foundation components Edit Foundation components are the brake assembly components at the wheels of a vehicle named for forming the basis of the rest of the brake system These mechanical parts contained around the wheels are controlled by the air brake system The three types of foundation brake systems are S cam brakes disc brakes and wedge brakes 3 Brake boost Edit Brake booster from a Geo Storm Most modern passenger vehicles and light vans use a vacuum assisted brake system that greatly increases the force applied to the vehicle s brakes by its operator 4 This additional force is supplied by the manifold vacuum generated by air flow being obstructed by the throttle on a running engine This force is greatly reduced when the engine is running at fully open throttle as the difference between ambient air pressure and manifold absolute air pressure is reduced and therefore available vacuum is diminished However brakes are rarely applied at full throttle the driver takes the right foot off the gas pedal and moves it to the brake pedal unless left foot braking is used Because of low vacuum at high RPM reports of unintended acceleration are often accompanied by complaints of failed or weakened brakes as the high revving engine having an open throttle is unable to provide enough vacuum to power the brake booster This problem is exacerbated in vehicles equipped with automatic transmissions as the vehicle will automatically downshift upon application of the brakes thereby increasing the torque delivered to the driven wheels in contact with the road surface Heavier road vehicles as well as trains usually boost brake power with compressed air supplied by one or more compressors Noise Edit Brake lever on a horse drawn hearse Main article Roadway noise Although ideally a brake would convert all the kinetic energy into heat in practice a significant amount may be converted into acoustic energy instead contributing to noise pollution For road vehicles the noise produced varies significantly with tire construction road surface and the magnitude of the deceleration 5 Noise can be caused by different things These are signs that there may be issues with brakes wearing out over time Fires EditRailway brake malfunctions can produce sparks and cause forest fires 6 In some very extreme cases disc brakes can become red hot and set on fire This happened in the Tuscan GP when the Mercedes car the W11 had its front carbon disc brakes almost bursting into flames due to low ventilation and high usage 7 These fires can also occur on some Mercedes Sprinter vans when the load adjusting sensor seizes up and the rear brakes have to compensate for the fronts 8 Inefficiency EditA significant amount of energy is always lost while braking even with regenerative braking which is not perfectly efficient Therefore a good metric of efficient energy use while driving is to note how much one is braking If the majority of deceleration is from unavoidable friction instead of braking one is squeezing out most of the service from the vehicle Minimizing brake use is one of the fuel economy maximizing behaviors While energy is always lost during a brake event a secondary factor that influences efficiency is off brake drag or drag that occurs when the brake is not intentionally actuated After a braking event hydraulic pressure drops in the system allowing the brake caliper pistons to retract However this retraction must accommodate all compliance in the system under pressure as well as thermal distortion of components like the brake disc or the brake system will drag until the contact with the disc for example knocks the pads and pistons back from the rubbing surface During this time there can be significant brake drag This brake drag can lead to significant parasitic power loss thus impacting fuel economy and overall vehicle performance History EditEarly brake system Edit In the 1890s Wooden block brakes became obsolete when Michelin brothers introduced rubber tires 9 During the 1960s some car manufacturers replaced drum brakes with disc brakes 10 Electronic brake system Edit In 1966 the ABS was fitted in the Jensen FF grand tourer 11 In 1978 Bosch and Mercedes updated their 1936 anti lock brake system for the Mercedes S Class That ABS is a fully electronic four wheel and multi channel system that later became standard 12 In 2005 ESC which automatically applies the brakes to avoid a loss of steering control become compulsory for carriers of dangerous goods without data recorders in the Canadian province of Quebec 13 Since 2017 numerous United Nations Economic Commission for Europe UNECE countries use Brake Assist System BAS a function of the braking system that deduces an emergency braking event from a characteristic of the driver s brake demand and under such conditions assist the driver to improve braking 14 In July 2013 15 UNECE vehicle regulation 131 was enacted This regulation defines Advanced Emergency Braking Systems AEBS for heavy vehicles to automatically detect a potential forward collision and activate the vehicle braking system On 23 January 2020 16 UNECE vehicle regulation 152 was enacted defining Advanced Emergency Braking Systems for light vehicles From May 2022 in the European Union by law new vehicles will have advanced emergency braking system 17 See also EditAdapted automobile Air brake rail Air brake road vehicle Anchor Advanced Emergency Braking System Anti lock braking system Archaic past tense of the verb to break see brake Band brake Bicycle brake systems Brake by wire or electromechanical braking Brake bleeding Brake lining Brake tester Brake wear indicator Braking distance Breeching tack Bundy tube Caster brake Counter pressure brake Disc brake Drum brake Dynamic braking Electromagnetic brake Regenerative brake Electronic Parking Brake Emergency brake train Engine braking Hand brake Line lock Overrun brake Parking brake Railway brake Retarder Threshold braking Trail braking Vacuum brake Wagon brakeReferences Edit Bhandari V B 2010 Design of machine elements Tata McGraw Hill p 472 ISBN 9780070681798 Retrieved 9 February 2016 Definition of brake The Collins English Dictionary Retrieved 9 February 2016 Foundation Brakes ontario ca Retrieved 2017 07 22 Nice Karim 2000 08 22 How Power Brakes Work Howstuffworks com Retrieved 2011 03 12 C Michael Hogan Analysis of highway noise Journal of Water Air amp Soil Pollution Volume 2 Number 3 Biomedical and Life Sciences and Earth and Environmental Science Issue Pages 387 392 September 1973 Springer Verlag Netherlands ISSN 0049 6979 David Hench May 8 2014 Train sparked fires cause explosions destroy trailers force evacuations Portland Press Herald Mercedes explains Hamilton brake fire on Mugello F1 grid www motorsport com Retrieved 2020 11 21 Sprinter 311 Rear Brakes on fire Mercedes Benz Owners Forums Retrieved 2020 11 21 The History of Brakes Did You Know Cars 28 August 2017 The History of Brakes Did You Know Cars 28 August 2017 The History of Brakes Did You Know Cars 28 August 2017 The History of Brakes Did You Know Cars 28 August 2017 Roll Stability Control system RSC Archived 2011 07 16 at the Wayback Machine https www unece org fileadmin DAM trans main wp29 wp29regs 2020 ECE TRANS WP 29 343 Rev 28 Add 1 pdf bare URL PDF https www unece org fileadmin DAM trans main wp29 wp29regs 2020 ECE TRANS WP 29 343 Rev 28 Add 1 pdf bare URL PDF https www unece org fileadmin DAM trans main wp29 wp29regs 2020 ECE TRANS WP 29 343 Rev 28 Add 1 pdf bare URL PDF Parliament approves EU rules requiring life saving technologies in vehicles News European Parliament Europarl europa eu 2019 04 16 Retrieved 2020 08 31 External links Edit Look up brake in Wiktionary the free dictionary How Stuff Works Brakes Retrieved from https en wikipedia org w index php title Brake amp oldid 1129034821, wikipedia, wiki, book, books, library,

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