Why Do Brake Pads Make Noise When Reversing?

[LaTyler]

The reasons why brake pads make noise when reversing are: 1. Metal hard spots can cause noise; 2. Severe wear, the warning piece will make noise to prompt replacement; 3. The brake disc and pads are in the running-in period; 4. There are foreign objects between the brake pad and disc; 5. Abnormal installation; 6. Poor return of the brake caliper. Brake pads, also known as brake linings, refer to the friction materials fixed on the brake drum or disc rotating with the wheel. The friction lining and friction block bear external pressure to generate friction, thereby achieving the purpose of vehicle deceleration. Their components include: 1. Steel plate; 2. Bonded heat insulation layer; 3. Friction block.

[DiJosephine]

I've recently dealt with several cars experiencing abnormal noises when braking in reverse, and there are a few common causes: surface rust on the brake discs is the main culprit, especially after the car has been parked outside in the rain—the rust produces a screeching sound when friction occurs during reverse braking. Another reason could be the change in angle of the brake pads between forward and reverse directions, leading to hard spots or uneven wear on the edges, which causes vibration and noise. It’s also possible that dust or small stones embedded in the brake discs are interfering with normal sliding. I recommend promptly removing rust and applying an anti-rust coating, as well as regularly checking whether the brake pad thickness meets standards. If left unrepaired, it may accelerate wear or trigger other malfunctions, and the reverse braking noise can also distract the driver, so don’t delay maintenance.

[EmilioDella]

From personal experience, the brake pads always squeak when reversing in rainy weather, which is particularly annoying. Upon disassembly and inspection, it was found that the brake discs had rusted, and the corroded areas made noise when rubbing in humid conditions. The mechanic explained that during forward braking, the wear is even, but reversing causes reverse friction, which easily triggers noise. Additionally, long-term parking or frequent hard braking exacerbates the issue. My advice is to regularly clean the brake system and avoid parking in the rain to effectively reduce unusual noises. If left unrepaired, while not immediately dangerous, it will increase maintenance costs. Sharing this to remind everyone to pay more attention to daily driving habits.

[DiEvangeline]

The instructor once taught me that the squeaking noise when braking in reverse is mostly due to improper brake system design or usage. After the brakes wear smoothly in the forward direction, the change in friction angle during reverse can cause inconsistent sounds. This is common in new cars or vehicles parked for extended periods, where brake pads may accumulate dust or have slight deformations. Occasional minor noises are usually harmless, but persistent squeaking warrants inspection. I've developed a habit of visually checking the brake pads before each drive to ensure there are no obvious contaminants for safety.