What Causes the Abnormal Noise When Braking in Reverse?
2 Answers
The reasons for abnormal noise when braking in reverse: 1. The brake caliper piston does not return to its normal position. The braking effect of a car mainly relies on the friction generated by the tight contact between the brake pads and the brake disc; 2. Friction caused by rust on the brake disc is a very common phenomenon, especially after driving through water, when the brake disc may develop small rust spots; 3. For vehicles equipped with an electronic braking system, a malfunction in the handbrake system can also cause abnormal noise; 4. For commonly used hand-pull handbrakes, there is a common component called the handbrake cable. After prolonged use, the steel wire inside the cable may wear out, leading to poor return. This can result in the handbrake pads still contacting the brake disc even when the handbrake is released, causing abnormal noise while driving.
A while ago, I heard a squeaking sound when braking in reverse, which was quite alarming. I asked a mechanic friend, and he said there could be several reasons: small stones or dust stuck on the brake pads, especially after rainy or muddy roads; the brake pads might be worn down, and the thin thickness causes a screeching sound during reverse friction; or there could be rust or pits on the brake discs, leading to abnormal friction due to different forces when reversing. You can check if the brake pads have at least 3mm of thickness left; otherwise, they need replacement. Delaying too long can affect braking performance and even cause issues in other driving conditions. I quickly took it to the shop to clean the dust, and now it drives much more smoothly. Don’t overlook these small issues in daily driving—safety first.
