When engaged, a parking brake (emergency brake, e-brake or handbrake) applies brakes to both rear wheels, keeping the car from rolling. In cars with mechanical parking brakes, parking brake cables connect the parking brake lever or pedal to the rear brakes. Parking brake cablesParking brake cables. Because the cables run underneath the car, they tend to rust and seize up. Other problems with cables include stretching, fraying, and breaking apart.
If the cable is seized, the parking brake may stop working and cause the vehicle to roll on an incline with the parking brake engaged. In other cases, a sticky parking brake cable may cause the parking brakes to not release fully. This can cause "brake drag" when it feels like the vehicle is not rolling freely. You also might notice squeaking noises from one or both rear brakes when driving at slow speeds. The rear wheel where the parking brake is not released fully may also appear excessively hot after driving. The parking brake handle or pedal may feel too tight or too loose when operated.
Typically, mechanics check the parking brake operation during regular services that include a brake inspection. In some shops, a simple oil change might not include testing of the parking brake; in this case, you can ask a mechanic to check it separately. Often the damage to a parking brake cable is visible. Damaged parking brake cables this truck, the parking brake cable was rusted inside and sticking due to jacket damage. Parts of the cables (conduits) are protected by a PVC jacket. When the PVC jacket is damaged, water gets inside the cable and causes it to rust and seize up. If the cable is sticking, but not otherwise damaged, freeing and lubricating it might be enough. The parking brake operation must be properly tested after repairs. A properly working parking brake must engage with a few clicks of the lever or pedal and release fully when the pedal or lever is released. The number of clicks is usually listed in the inspection procedure in the factory service manual for technicians.
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