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2. Relay valve - Wikipedia

   en.wikipedia.org/wiki/Relay_valve

   Without relay valves, it would take too long for sufficient air to travel from the brake pedal valve to the rear of the truck or trailer in order to apply the rear service brakes concurrently with the front service brakes, resulting in a condition known as brake lag. To correct this condition on a long-wheel-base vehicle, a relay valve is ...

3. Sudden unintended acceleration - Wikipedia

   en.wikipedia.org/wiki/Sudden_unintended_acceleration

   SUA resolutions include applying the brakes or clutch, or shifting into neutral with an automatic transmission. [72] [73] [3] In most cars, fully applied brakes are easily capable of stopping the car while the accelerator pedal is also fully applied. [17] "

4. Engine braking - Wikipedia

   en.wikipedia.org/wiki/Engine_braking

   Engine braking is a viable method of controlling the speed at which a vehicle travels downhill. By shifting to a lower gear in a manual transmission, or applying "low" mode on an automatic transmission, engine braking reduces the need to repeatedly apply the foot brake, lowering the risk of the brakes overheating. [2]

5. 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.

6. Retarder (mechanical engineering) - Wikipedia

   en.wikipedia.org/wiki/Retarder_(mechanical...

   Exhaust brakes are simpler in operation than an engine brake.Essentially, the exhaust pipe of the vehicle is restricted by a valve.This raises the pressure in the exhaust system, forcing the engine to work harder on the exhaust stroke of its cylinders, so again the engine is acting as an air compressor, with the power required to compress the air being withheld from the exhaust pipe, retarding ...

7. Overrun brake - Wikipedia

   en.wikipedia.org/wiki/Overrun_brake

   The older spring based systems had performance issues, and an insufficiently well designed and implemented system can be nonfunctional and undrivable. The problem with these spring based systems happens as follows: As the towing vehicle brakes, the trailer travels forward, sliding the mechanism, for a distance before trailer braking begins.