Reasons for Abnormal Noise When Reversing a New Car?
3 Answers
When reversing, due to the opposite direction of vehicle movement, there is a certain amount of clearance between the brake pads and the rear end of the bracket. Therefore, when braking, the brake pads will impact the rear surface of the bracket, resulting in abnormal noise. In fact, the abnormal noise during reversing is a normal clearance noise and is not a sign of vehicle malfunction. Here are some methods to address abnormal brake noise: A thin layer of lubricating grease can be applied to the parts where the brake pads connect with the brake caliper bracket. This can help improve the phenomenon to some extent. However, it is important to note that when applying the lubricating grease, avoid applying it to the friction surface of the brake pads and the brake disc, as this could negatively affect braking performance.
I just bought a new car and it always makes strange noises when reversing, like metal scraping or squeaking, which is a bit annoying. New car noises are quite common, possibly related to the break-in of chassis components. For example, brake pads and rotors may have uneven surfaces during the initial period, causing squeaking when reversing due to uneven force distribution—this usually goes away after a few days of driving. Another reason could be that the new springs or shock absorbers in the suspension system haven’t fully settled yet, especially when reversing at sharp angles in a garage, resulting in a clunking sound, which is normal and nothing to worry about. Also, check if the tire pressure is correct; unstable pressure from the factory to the dealership or uneven contact between the wheels and the ground might cause noise. If the noise persists, I recommend visiting a 4S shop to inspect the brake rotors or transmission linkage, as these details are most likely to reveal minor issues during the break-in period. In short, after 1,000–2,000 km of driving, such noises usually disappear. Meanwhile, avoid sudden braking or sharp steering when reversing to help the parts adapt smoothly.
As a car enthusiast, I've also noticed the issue of strange noises when reversing in new cars, which usually stems from insufficient early break-in of the drivetrain or suspension. For instance, if the new gears in the rear differential aren't tightly meshed yet, the sudden change in force when shifting between forward and reverse can cause a clicking or grinding sound. Additionally, there might be slight gaps between the brake calipers and their brackets in new cars, leading to a squeaking noise when braking while reversing—this is all part of the natural break-in process and typically quiets down after a month or so of driving. I've also encountered cases where the tires didn't perfectly match the wheel arches, causing a rustling sound when reversing and turning sharply as the tires rubbed against the wheel arch edges. Sometimes, post-delivery adjustments to tire positioning or checking the suspension travel are needed. If the transmission fluid is too cold or the driveshaft lacks proper lubrication, the increased engine load during reversing can also produce unusual noises—try adding more lubricant or warming up the car longer. With new cars, most noises aren't serious issues, but regular checks can prevent potential damage, such as ensuring all underbody bolts are tight. I make it a habit to have the mechanic inspect these during the first service.
