Reasons for Clicking Noise When Reversing a New Car?

[Aragorn]

Reasons for clicking noise when reversing: The noise occurs when the brake caliper hits the caliper bracket during braking while reversing. Under gravity, the brake caliper moves downward. Since the caliper and bracket are floatingly connected, when braking while reversing, the caliper is lifted upward and hits the upper bracket, producing the noise. This is normal. Braking System: The braking system can be divided into the service brake system, parking brake system, emergency brake system, and auxiliary brake system. The system used to slow down or stop a moving car is called the service brake system; the system used to keep a parked car stationary is called the parking brake system. Functions: In case the service brake system fails, the system that ensures the car can still decelerate or stop is called the emergency brake system. During driving, the system that assists the service brake system in reducing or maintaining speed but cannot bring the vehicle to an emergency stop is called the auxiliary brake system. Among all braking systems, the service brake system and parking brake system are mandatory for every vehicle.

[DelGenesis]

I've thought about the creaking sound when reversing a new car, and it's most likely due to the break-in period of chassis components. The rubber bushings in the suspension and anti-roll bar bushings are particularly tight when the car leaves the factory, causing squeaks when subjected to torque during reversing. There might also be slightly larger assembly gaps in metal parts, especially noticeable on cold mornings with significant temperature differences. A friend's new car had brake pads that weren't fully broken in, causing a slight displacement and knocking sound against the brake disc when reversing. Of course, don't completely rule out issues with the driveshaft or half-shaft, although the probability is lower. If it were me, I'd drive about a thousand kilometers first to observe. If the noise persists after the break-in period or gets worse, make sure to take it back to the dealership for a suspension bolt torque check while it's still under warranty—never attempt to disassemble it yourself.

[Johnson]

From your description, it sounds like the suspension bushings. The grease inside the bushings of a new car hasn't been evenly distributed yet. When reversing with the steering wheel turned to the limit, the wheels are at their maximum steering angle, causing the rubber components to stretch and produce that thudding sound. For front-wheel-drive cars, special attention should be paid to the CV joint. While it's unlikely to fail in a new car, if the dust boot clamp isn't installed properly and leaks grease, it could become problematic. Also, check if all the wheel hub bolts are properly tightened. Some owners have experienced loose bolts upon delivery, resulting in a clanking sound when reversing. Actually, the simplest solution is to record a video and send it to the after-sales service. Nowadays, 4S shops have technical support groups, and sending a video is much more effective than verbal descriptions.

[DeAugust]

Just got your new car? Don't panic, check these three things first: First, warm up the engine before testing - transmission fluid is viscous when cold, which may cause a noticeable jolt when engaging reverse gear. Second, try reversing on both paved roads and flat ground to rule out small stones stuck in tire treads. The biggest concern should be transmission mount bolts - last year while inspecting a relative's car, I encountered a case where chassis bolts were half a turn loose, causing engine displacement and transmission wobble during reversing with very noticeable metal clanking sounds. For cars with auto-hold function, pay attention to whether there's a clicking sound when the electronic parking brake releases - this is normal. Minor noises during the break-in period are quite common, but if they persist beyond two weeks, you must take it to the dealership for inspection.

[LaQuinn]

There are several scenarios for the clunking sound: If it occurs once at the initial stage of reversing, it's most likely a brake pad issue. When the brake discs and pads are new, the contact surface isn't perfect. If the brake caliper doesn't fully release when shifting into reverse, and the hydraulic pressure in the brake lines isn't completely released, the brake pads may retract slightly slower, causing a slight collision with the brake disc and producing the sound. If the clunking is rhythmic (like 'clunk-clunk'), then the driveshaft universal joint should be inspected. I recommend starting with a simple test: lightly apply the brakes while reversing on a flat road. If the abnormal noise disappears, it's probably an issue with the brake system (80% chance). Pay special attention to vehicles with auto start-stop systems—the moment the engine restarts and you shift into reverse, it can easily cause impact-related abnormal noises. Try turning off the start-stop function to see if the noise persists.