Why is there abnormal noise when reversing?
2 Answers
Abnormal noise during reversing is a normal clearance noise and does not indicate a vehicle malfunction. Since the brake pads are mounted on the brake caliper bracket, under normal circumstances, the brake pads are tightly fitted against the forward-facing end surface of the bracket, leaving no clearance gap. Therefore, no abnormal noise occurs when braking while moving forward. However, when reversing, due to the opposite direction of vehicle movement, there is a certain clearance gap between the brake pads and the rear end of the bracket. As a result, during braking, the brake pads will impact the rear end surface of the bracket, producing a clunking noise, which is a normal phenomenon. Methods to resolve this abnormal noise: A thin layer of lubricating grease can be applied to the contact areas between the brake pads and the brake caliper bracket. This can help mitigate the phenomenon to some extent. However, it is important to note that the lubricating grease should not be applied to the friction surface of the brake pads or the brake disc, as this could negatively affect braking performance.
As an experienced driver, when I hear unusual noises while reversing, my first thought is that there might be an issue with the braking system, such as worn brake pads or a stone caught in them, producing a squeaking or metal grinding sound. It could also be loose suspension components; when suspension springs or bushings age, the pressure during reverse turns can cause a cracking noise. Worn reverse gears in the transmission can also lead to similar noises, especially in automatic cars that haven't had their oil changed for a long time. I believe regular maintenance is crucial—checking brake pad thickness monthly to avoid waiting until problems become severe. This not only saves money but also ensures driving safety. Finally, if the noise persists, I would promptly drive to a nearby repair shop for a professional inspection, as safety is no small matter.
