Why does the car's reverse brake disc make a squeaking sound?
2 Answers
Introduction to the reasons why the car's reverse brake disc makes a squeaking sound: 1. The vehicle has been parked outdoors for a long time and encountered rainy weather, causing rust in the chassis steering system. 2. The steering wheel is turned to the limit when reversing, causing the steering power pump to make a squeaking noise. 3. There is friction between the universal joint and the bearing in the steering system. 4. There is an issue with the ball joint or suspension arm of the front wheel chassis. 5. Friction between the brake pads and the brake disc. 6. Note: For new cars with less than 10,000 kilometers, the squeaking noise is mostly due to the first two reasons, and generally, the driver can check it themselves. If the noise is caused by rust, it usually disappears after driving for a while. If the noise occurs when the steering wheel is turned to the limit during reversing, slightly turning the steering wheel back to eliminate the noise is normal. The last three situations usually require inspection by professional technicians at a car 4S store or repair shop.
After all these years of repairing cars, squeaky brake discs when reversing are all too common. The main causes are rust on the brake disc surface or moisture buildup. If a car sits overnight, especially on rainy days, condensation easily forms on the discs, and the rust that develops will produce a sharp squeal when reversing at low speeds due to friction. Another possibility is that the edges of the brake pads have hardened from wear or become loose during installation, leading to uneven contact and noise. I recommend that drivers reverse a few times after parking to shake off some of the rust. If the noise persists, it's best to visit a professional shop to check the brake pad thickness and disc surface, resurfacing or replacing parts if necessary. Regular brake system maintenance is crucial—it prevents such issues and ensures quiet, safe reversing. Don’t underestimate the squeaking—while mostly harmless, over time it can affect overall braking performance.
