Why can't the parking brake hold the car?
2 Answers
The reason the parking brake can't hold the car is severe wear of the brake pads, which need to be replaced. If the brake pads are fine, then the parking brake cable may have stretched, requiring adjustment. Below are specific details about the parking brake: Introduction: The professional term for the parking brake is auxiliary brake. Unlike the main braking system, it uses a steel cable connected to the rear brake shoes to apply braking force. Long-term use of the parking brake can cause the steel cable to undergo plastic deformation. Since this deformation is irreversible, prolonged use will reduce its effectiveness, and the parking brake's travel distance will increase. Composition: It consists of a brake lever, cable, braking mechanism, and return spring, acting on the driveshaft or rear wheel brakes to stabilize the vehicle.
I've seen many cases where the handbrake doesn't hold well, mainly due to several reasons. First, the handbrake cable may be loose or aged and stretched. Prolonged use can cause the cable to elongate, resulting in insufficient braking force. Second, the brake shoes or brake drums may be severely worn. If they wear down to the minimum thickness, the friction decreases. Third, the handbrake system might be improperly adjusted, such as loose screws or adjusters inside, which need to be tightened again. I've dealt with similar situations myself: first, try pulling the handbrake lever—if it goes up too high without resistance, it's definitely a cable issue. Then, inspect the rear wheel brake components to see if the shoes are worn flat. During regular maintenance, pay attention to cleaning the brake system to avoid dust buildup. If the problem occurs, don't attempt to fix it yourself—go to a professional shop immediately for inspection, adjustment, or part replacement. Safety is the top priority.