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.

[DiCourtney]

I recently experienced the issue of abnormal noises when reversing a cold car, especially on winter mornings after starting the vehicle. This sound typically comes from the braking system, as the brake discs are prone to rust in cold conditions, and the friction between the brake pads and the rust layer when reversing produces a sharp squeaking noise. If the abnormal noise occurs more frequently after parking in a humid environment or after rain, it indicates faster rust accumulation. The solution is to press the brakes a few times after starting the car to remove the surface rust. However, if the noise persists, it may be due to worn brake discs or brake pad issues, and it is recommended to visit a professional repair shop for inspection to prevent brake failure when reversing, which could lead to danger. Parking away from open areas with standing water can help reduce rust issues. Although this type of noise is not severe, ignoring it may increase repair costs.

[DeAngela]

After years of driving, I've found another common cause of cold car reverse gear noise is issues with the drivetrain, particularly insufficient lubrication between automatic transmission gears. During cold starts, transmission oil thickens, causing gears to experience dry friction under reverse load, resulting in rattling or clicking sounds. This phenomenon is more pronounced in cold regions and is especially common in older vehicles. I recommend checking the transmission fluid level and quality, as regular oil changes can improve lubrication; while at it, inspect the drive shafts for looseness or wear. Reverse gear is a frequent operating condition, addressing it early can avoid costly repairs from damaged drivetrain components while ensuring safe driving control.

[StellaLynn]

My old car has been running for ten years, and occasionally makes noise when reversing in cold conditions, mainly due to aging suspension components. The shock absorbers stiffen in low temperatures, and when reversing, the springs compress or the ball joint lubrication is insufficient, leading to metal friction sounds. A simple check is to manually press down on the body after parking and listen for any abnormal noises from the chassis. If the issue is minor, lubricating the relevant parts can resolve it; if it occurs frequently, replacing the shock absorbers or suspension bushings is recommended. The cost is low but can prevent suspension failure from affecting handling safety.