A more complex unit (first seen on the 2003 Audi A8) uses a computer-controlled motor attached to each of the two rear brake calipers referred to as the Motor on Caliper (MoC) system. Two variations are available: In the more-traditional "cable-pulling" type, an electric motor simply pulls the parking brake cable on the push or pull of a button rather than a mechanical lever or pedal in the cabin. Introduced to the mainstream market in 2001, it was first used in the 2001 BMW 7 Series (E65). Many vehicles have a combination of the two a pedal to engage the brake and a handle to release it.įurther information: Electronic parking brakeĪ recent development is the electronic parking brake, also known as an electric park brake. A pull handle variation also exists by pulling or releasing the handle, this engages and releases the parking brake, respectively. Depressing the foot pedal would engage the brake and pressing it again will release it. Some vehicles have the parking brake operated by a small foot pedal, located by the other pedals. In older vehicle models, a stick lever may be used instead which is located under the instrument panel. To disengage the brake, the button is held while simultaneously pulling the lever up to disengage the ratchet and then pushed all the way down with the button still held. Operating the brake is performed by pulling the lever up (which is connected to a ratchet) until there is tension. The most common placement of the parking brake is in the center console of the vehicle, in between the driver and front passenger seats. Parking brake variations īrake warning light Center or stick lever In such cases, the lever should be slowly engaged to prevent locking up the wheels and reduce speed. In the event of hydraulic brake failure, the parking brake can be used to slow a vehicle. This is known as a handbrake turn, which is often performed in street racing and off-road rally racing to initiate rear wheel drift. It is not recommended to use the parking brake when the vehicle is in-motion, unless there is a problem with the main brakes, as this can lock the back wheels and cause a skid. The parking brake would ensure the car is secure, should another vehicle come into physical contact from behind, causing the car to jolt forward. Other common situations is when the vehicle is stopped at a traffic light, a pedestrian crossing, or simply waiting to turn in front of oncoming traffic. For example, the brake can be engaged when moving off an uphill slope, as this allows the driver to hold the accelerator and clutch pedals steady without the vehicle rolling backwards. In manual and automatic transmission vehicles, the parking brake can also be used for various driving situations which require the vehicle to be momentarily stopped. Pictograph symbols and/or lights may be used to indicate the location of a parking brake, its application or release. The mechanical nature allows the driver to apply the brake even if the main hydraulic brake system fails. Traditionally engaged by pulling a lever, the cables manually engage part of the car's braking system, usually the rear disk or drum brakes. The parking brake in most vehicles is still completely mechanical. In a manual transmission, leaving the car in first gear (or in reverse if pointing downhill) is also advised, as the engine will prevent the car from rolling if the parking brake fails. Similarly, on a downhill gradient, the front wheels should face the curb for the same reason, and the wheels should face to the right on an uncurbed road regardless of orientation. This would prevent the car from rolling into the roadway by using the curb to block the front passenger tire in the event of a parking brake failure. ![]() When parking on an uphill gradient, it is recommended that the front wheels face away from the curb. In manual transmission vehicles, the parking brake can be engaged to help keep the vehicle stationary. However, it is recommended to use it, as the parking pawl in the gearbox could fail due to stress or another vehicle striking the car, causing the car to roll. While most automatic transmission vehicles have parking brakes, it is often not engaged by American drivers when parking. The mechanism may be a hand-operated lever, a straight pull handle located near the steering column, or a foot-operated pedal located with the other pedals. In most vehicles, the parking brake operates only on the rear wheels, which have reduced traction while braking. Parking brakes often consist of a pulling mechanism attached to a cable which is connected to two wheel brakes. In road vehicles, the parking brake, also known as a handbrake or emergency brake ( e-brake), is a mechanism used to keep the vehicle securely motionless when parked.
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