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  2. Relay valve - Wikipedia

    en.wikipedia.org/wiki/Relay_valve

    When the driver depresses the brake pedal, a small amount of air momentarily opens the relay valve's supply port, which then directs air from the remote air-supply directly to the rear service brake chambers, and quickly applies the rear service brakes. The pressure delivered to the service brake chambers in this manner will equal the control ...

  3. Vacuum servo - Wikipedia

    en.wikipedia.org/wiki/Vacuum_servo

    A vacuum servo is a component used on motor vehicles in their braking system, to provide assistance to the driver by decreasing the braking effort. In the US it is commonly called a brake booster . A vacuum servo, also known as a power booster or power brake unit, uses a vacuum, usually supplied by the engine, to multiply the driver's pedal ...

  4. Servomechanism - Wikipedia

    en.wikipedia.org/wiki/Servomechanism

    Following a specified motion trajectory is called servoing, [4] where "servo" is used as a verb. The servo prefix originates from the Latin word servus meaning slave. [1] The term correctly applies only to systems where the feedback or error-correction signals help control mechanical position, speed, attitude or any other measurable variables. [5]

  5. Traction control system - Wikipedia

    en.wikipedia.org/wiki/Traction_control_system

    It is often implemented with an electronic limited-slip differential, as well as other computerized controls of the engine and transmission. The spinning wheel is slowed with short applications of brakes, diverting more torque to the non-spinning wheel; this is the system adopted by Range Rover in 1993, for example. ABS brake-traction control ...

  6. Sudden unintended acceleration - Wikipedia

    en.wikipedia.org/wiki/Sudden_unintended_acceleration

    With the series of recall campaigns, Audi made several modifications; the first adjusted the distance between the brake and accelerator pedal on automatic-transmission models. Later repairs, of 250,000 cars dating back to 1978, added a device requiring the driver to press the brake pedal before shifting out of park. [ 39 ]

  7. Drive by wire - Wikipedia

    en.wikipedia.org/wiki/Drive_by_wire

    Not to be confused with park-brake by wire which engages a parking brake, park-by-wire engages the parking pawl. A parking pawl in a traditional automatic transmission has a mechanical link to the gear stick and locks the transmission in the park position when the gear-shift handle is set in "park". A park-by-wire system uses electronic ...

  8. Brake fade - Wikipedia

    en.wikipedia.org/wiki/Brake_fade

    Brake fade can be a factor in any vehicle that utilizes a friction braking system including automobiles, trucks, motorcycles, airplanes, and bicycles. Brake fade is caused by a buildup of heat in the braking surfaces and the subsequent changes and reactions in the brake system components and can be experienced with both drum brakes and disc ...

  9. Tell-tale (automotive) - Wikipedia

    en.wikipedia.org/wiki/Tell-tale_(automotive)

    A group of tell-tales showing lights for "brake fluid", "stop lamp" and "check engine" Graphical tell-talesA tell-tale, sometimes called an idiot light [1] or warning light, is an indicator of malfunction or operation of a system, indicated by a binary (on/off) illuminated light, symbol or text legend.