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2. Brake - Wikipedia

   en.wikipedia.org/wiki/Brake

   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]

3. Hydraulic brake - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_brake

   The hydraulic braking system is designed as a closed system: unless there is a leak in the system, none of the brake fluid enters or leaves it, nor does the fluid get consumed through use. Leakage may happen, however, from cracks in the O-rings or from a puncture in the brake line.

4. Air brake (road vehicle) - Wikipedia

   en.wikipedia.org/wiki/Air_brake_(road_vehicle)

   Truck air-actuated disc brake. An air brake or, more formally, a compressed-air-brake system, is a type of friction brake for vehicles in which compressed air pressing on a piston is used to both release the parking/emergency brakes in order to move the vehicle, and also to apply pressure to the brake pads or brake shoes to slow and stop the vehicle.

5. Relay valve - Wikipedia

   en.wikipedia.org/wiki/Relay_valve

   When the driver partially or fully releases the brake pedal, the control-pressure delivered by the foot-valve decreases; this causes the relay valve's supply port to close, and its exhaust port to momentarily open, thus preventing a pneumatic short-circuit from occurring while the air exhausts from all rear service brake chambers.

6. Anti-lock braking system - Wikipedia

   en.wikipedia.org/wiki/Anti-lock_braking_system

   Symbol for ABS ABS brakes on a BMW motorcycle. An anti-lock braking system (ABS) is a safety anti-skid braking system used on aircraft and on land vehicles, such as cars, motorcycles, trucks, and buses. [1]

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