adminAUTOMOBILE BRAKE
An automobile brake is a mechanical device used to slow down, stop or hold stationary a moving vehicle by converting kinetic energy into heat energy through friction or in some modern vehicle into electrical energy through regeneration.
There are several types of automobile brake and they are; disc, drum, anti-lock, regenerative, hydraulic , air (pneumatic), electromagnetic and carbon-ceramic braking system.
A disc brake is a friction based braking system where a flat circular metal rotor attached to the wheel hub is squeezed between two brake pads by a caliper. Examples include; brembo mono block calipers on Ferrari and Lamborghini, Toyota corolla front ventilated disc, Porsche PCCB (Porsche ceramic composite brake) , BMW M-series 6 piston calipers etc.
A drum brake is a friction braking device where curved brake shoes press outwards against the inner surface of a rotating drum attached to the wheel. Examples include; rear brakes of Toyota yaris and Honda brio, rear axle of many pickup trucks and vans, parking brake systems on most rear wheel drive vehicles, heavy commercial trucks (combined with air actuation) etc.
Antilock braking system (ABS) is an electronic safety system that prevents the wheels from locking up (skidding) during heavy braking. It allows the driver to maintain steering control while stopping and typically reduces stopping distances on most surfaces. Examples include; Bosch ABS 9 (used in most European passenger cars), continental MK100 ABS, Honda CBS+ABS on motorcycles, Bendix ABS on commercial trucks etc.
Regenerative braking is an energy recovery system used primarily in electric and hybrid vehicles. Instead of wasting kinetic energy as heat, it captures that energy and converts it back into electricity stored in the battery for later use. Example includes tesla model 3 one pedal driving (maximum regen), Toyota Prius hybrid regenerative system, Nissan leaf e-pedal, BMW i3 and i4 regen system, formula 1 KERS (kinetic energy recovery system) etc.
Hydraulic brakes are standard actuation mechanism used in virtually all modern automotive friction brake system. They use incompressible brake fluid transmitted through sealed lines to multiply and distribute pedal force to all four wheels simultaneously. Examples include; standard brake systems in Toyota, ford, Honda, BMW, Volkswagen etc.
Air or pneumatic brakes use compressed air instead of hydraulic fluid to actuate the friction brakes. They are the mandatory standard for heavy commercial vehicles worldwide because of their superior scalability, reliability and inherent fail safe design. Examples include; Wabeo and Knorr-Bremse systems on Volvo, Mercedes, Scania trucks etc.
Electromagnetic brakes use the principles of electromagnetism to generate braking force. There are two main types; eddy current brakes (contactless, no wear) and electromagnetic friction brakes ( uses electromagnetic force to clamp friction surfaces). Examples include; telma electromagnetic retarder on Volvo and Renault trucks, eddy current brakes on shinkansen (Japan) and TGV (France) high speed trains, electromagnetic parking brakes on BMW and Mercedes luxury cars etc.
Carbon-ceramic brakes also called CCM or carbon ceramic matrix brakes use rotors made from carbon fiber reinforced silicon carbide composite instead of conventional cast iron. They are used primarily on high performance road cars. Examples include; Brembo CCM rotors on Ferrari SF 90, Lamborghini Huracan, Mclaren 720s, Porsche PCCB on 911 turbo and GT3, Mercedes-AMG ceramic brake package on GT black series, carbon brakes on all current formula 1 cars etc.
The advantages of automobile brakes are; brakes provides for precise, consistent stopping power across a wide range of speeds and road conditions. Disc brakes now standard on most vehicles, dissipate heat efficiently and maintain performance under repeated hard braking. Regenerative braking in electric and hybrid vehicles converts kinetic energy back into electricity, extending rang e by 10% to 30%. Modern compound brake pads and larger ventilated rotors have dramatically reduced stopping distances. Vacuum assisted power brakes and electronic brake boosters reduce the pedal force required thus making driving less fatiguing and more accessible.
The disadvantages of automobile brakes are; brakes parts require frequent replacements and maintenance with replacement cost ranging from modest to very expensive. Brake pads wear generates particulate matter, a significant source of urban air pollution. Brakes after sustained use can overheat, leading to reduced stopping power. Abs, ESC and brake by wire systems add electronic complexity, failure of sensors or control modules can lead to dangerous consequences.
The application of automobile brakes are as follows; they find application in various forms in passenger cars, electric vehicles, heavy trucks, motor cycles, racing/motor sport cars, trains, aircrafts etc.
The future of automobile brakes depends on the advances and development of the following technologies; brake by wire systems will enable faster response times, Integration with autonomous systems and precise wheel control. The use of copper free and low dust pads will lead to cleaner, low emission friction materials. AI assisted braking will enhance the capability of brakes to respond to various road conditions, traffic patterns and vehicle load to pre-condition brakes, modulate pressure proactively and reduce wear. As electric vehicle technology matures it is expected that braking or deceleration will be through regenerative braking reserving friction brakes for emergency only thus dramatically reducing pad/rotor wear and eliminating most brake dust. The future trajectory of braking is clear, less friction, more electronics, tighter integration with vehicle intelligence systems.
SOURCES:
- Automotive braking systems by James D. Halderman.
- Brake design and safety by Rudolf Limpert.
- Braking of road vehicles by Andrew Day.
- Automotive braking systems by Tom Birch.
- Automotive braking systems by Nicholas Goodnight and Kirk T. VanGelder.
