What Causes the Abnormal Noise When Reversing?
2 Answers
Possible causes include incomplete retraction of the brake pads, looseness in the driveshaft CV joint, or abnormal wear of internal transmission components. It could also be due to particles detaching from the surface of the brake pads, which accumulate on one side of the pad as the brake disc rotates. Below is a detailed explanation of abnormal noises during reversing: 1. The noise during reversing is actually a normal backlash sound. Since the vehicle is moving in the opposite direction, there is a certain gap between the brake pad and the rear end of the bracket. When braking, the brake pad impacts the rear surface of the bracket, producing a clunking noise. This is normal and not a cause for concern. However, if abnormal noises occur, it's important to promptly visit a 4S shop for inspection and repair. 2. Related to torque. Due to the principle of physical torque, the friction pressure at the front and rear ends of the brake pad differs. The front-end pressure is generally significantly lower than the rear-end, which is why in some "multi-piston" caliper products, the pistons closer to the front end of the friction surface are smaller. This torque causes the brake pads to develop a slight difference in thickness between the front and rear ends after wear, meaning a certain degree of uneven wear has occurred. When you suddenly reverse, this balanced uneven wear is abruptly "twisted," leading to abrupt brake engagement during reverse braking and accompanied by squealing noises due to torque imbalance.
I've experienced squeaking sounds when reversing, which are usually caused by issues with the braking system. The friction between the brake pads and discs may be uneven during reversing, or there could be foreign objects stuck, or the brake pads may be severely worn, producing sharp noises. Additionally, wear and tear on suspension components, such as aging or cracked rubber bushings on shock absorbers, can cause squeaking sounds under the pressure of reversing. For manual transmissions, the clutch may also produce abnormal noises when slipping during reversing. Loose chassis components, like loose ball joints on the stabilizer bar, can result in clunking sounds. Don't underestimate these noises; neglecting them for a long time could damage other parts. It's recommended to first check for stones in the brake pads and tires yourself, then promptly visit a professional repair shop for a comprehensive inspection, which can save a lot of trouble.
