What Causes the Abnormal Noise When Reversing a Cold Car?

[VonDylan]

Abnormal noises during reversing are generally caused by brake noises, which are normal clearance noises and not a sign of vehicle malfunction. Applying a thin layer of lubricant to the contact points between the brake pads and the brake caliper bracket can help alleviate this issue to some extent. When applying the lubricant, be careful not to get it on the friction surface of the brake pads or the brake disc, as this could negatively impact braking performance. Since the brake pads are mounted on the caliper bracket, under normal conditions, they fit tightly against the bracket's forward-facing end surface without any clearance, so no abnormal noise occurs when moving forward. However, during reversing, the vehicle's direction of movement is opposite, and there is some clearance between the brake pads and the rear end of the bracket. As a result, when braking, the brake pads may hit the rear surface of the bracket, producing a noticeable clunking sound.