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What Causes the Abnormal Noise When Braking in Reverse?

1 Answers

Hernandez

07/29/25 11:07pm

Here are the specific reasons for the abnormal noise when braking in reverse: 1. Abnormal return of the brake caliper piston: The braking effect of a car mainly relies on the tight contact between the brake pads and the brake disc, which generates friction. The movement of the brake pads is driven by the thrust formed by the piston movement in the brake caliper. Therefore, after braking is completed, the piston in the brake caliper should return to its normal position to release the brake pads and disengage the brake. If the water content in the brake fluid exceeds the specified 3%, it may cause the caliper piston to stick, preventing the brake pads and brake disc from returning to their free movement position. This results in a metal friction sound when reversing. 2. Friction noise caused by rust on the brake disc: If the brake pads are made of semi-metallic materials, they can rust along with the brake disc, reducing the free movement gap between them. This not only causes abnormal noise during the initial stages of driving, including reversing, but also makes the brakes unusually sensitive due to the altered contact surfaces. 3. Reverse noise caused by a faulty handbrake system: The handbrake cable operates within the realm of mechanical movement. After prolonged use, the steel wire inside the cable may wear out, leading to poor return performance. This can cause the handbrake pads to remain in contact with the brake disc even after the handbrake is released, resulting in abnormal noise while driving.

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