What Causes the Handbrake to Fail?
3 Answers
Because the handbrake cable is broken. Here is some relevant information about the handbrake: 1. Introduction to the handbrake: The parking brake, commonly known as the handbrake, functions to provide resistance to the car when parked, preventing it from rolling. The parking brake, whether it's the handbrake or the parking gear in an automatic transmission, locks the drive shaft or rear wheels. The force of the parking brake is much weaker compared to the service brake, just enough to prevent the car from rolling on a slope. 2. Precautions for using the handbrake: Do not pull the handbrake to the highest position, as the cable in the handbrake system includes not only steel wires but also nylon ropes. If it is pulled to the highest position every time, the nylon rope will quickly suffer from material fatigue.
I've encountered handbrake failure multiple times. Common issues include the handbrake cable rusting and seizing up, especially in humid areas or older vehicles. Last time I helped my neighbor check his car, we found the cable had completely rusted through, and the brake shoe return spring was also problematic. Another situation is when the handbrake adjustment mechanism loosens, particularly noticeable for those who frequently park on slopes—it needs regular tightening. Parking with the handbrake fully engaged for extended periods can also cause excessive wear on the brake shoes, making it ineffective in emergencies. Once at a repair shop, I saw a car with a seized rear wheel cylinder—now that was truly dangerous. My advice: if you notice the handbrake feels loose or makes unusual noises, get the entire braking system checked immediately.
There are many reasons for a car's handbrake failure. I've personally experienced cable breakage – that sudden loss of resistance is truly terrifying. The most common issue is loose adjustment screws, which happens to older vehicles. Another reason is brake pads wearing to their limit, causing the handbrake travel to become increasingly longer. Reminder: don't pull the handbrake immediately after washing your car, as moisture can easily cause cable rust. If you notice the car can still move when the handbrake is engaged, there might be oil contamination in the rear wheel brake drums, requiring brake system cleaning. Modified suspension vehicles require extra caution, as improper modifications can affect handbrake cable angles. Don't pull the handbrake too forcefully – hearing seven clicks is enough; excessive force will definitely damage the mechanism.
