Why is there a loud abnormal noise when braking in reverse?

[CeciliaLee]

Possible reasons for abnormal noise when braking in reverse are as follows: If it is a new car, because the brake pads and brake discs are new and still in the running-in period, they may make a slight hissing sound, which is normal and will usually disappear automatically after a few hundred kilometers. There may be foreign objects between the brake pads and brake discs, such as small particles like sand or small stones entering between the discs, which can cause a hissing sound. Extension: 1. The brake disc and brake pads may stick together due to rust, causing abnormal noise. This usually happens after driving in the rain and then leaving the car unused for a few days. The brake disc and brake pads rust and stick together, and when you start driving again, there will be abnormal noise, which is also normal. 2. In winter, if the brake pads and brake discs are exposed to cold for a long time, ice may form at the contact points. When starting the car, the slight noise caused by the ice melting is also a normal phenomenon.

[SanJade]

When I reverse, the brake makes a loud abnormal noise. Common causes include dust accumulation or rust on the brake pads, especially if the car has been parked for a few days after being exposed to rain. Additionally, if the brake pads are worn too thin or have uneven edges, they can produce sharp noises during friction. It's also necessary to check if small stones are stuck between the brake pads and the brake disc, which can amplify the noise when reversing. I recommend paying attention to the parking environment, avoiding dusty areas, and having the technician check the brake thickness and cleanliness during regular maintenance. If the abnormal noise persists, it could affect braking performance, so it's best to visit a repair shop to replace the parts promptly. Safety comes first, and it's better to avoid costly repairs for major issues later on.

[Louis]

Once when I was reversing, the brakes made a loud screeching noise, like metal grinding. I looked it up online and found many people have encountered this issue. The reason is rust or dirt on the brake disc surface, especially after humid weather. Later, I tried lightly pressing the brakes a few times while moving forward, and the noise reduced a bit. But the mechanic said if it happens repeatedly, it might be due to worn brake pads or improper installation causing poor contact. Don’t try to fix it yourself; it’s best to get it checked by a professional shop. For daily driving, it’s recommended to avoid sudden braking, and warming up the car for a few minutes before reversing can also reduce the chance of strange noises. Remembering this experience, I now get my brakes serviced every six months—it’s both economical and worry-free.

[McLiam]

Loud abnormal noises when braking in reverse are usually a sign of brake system issues. Don't ignore it, take immediate action. The loud noise indicates abnormal friction, possibly due to worn brake pads or foreign objects. The reverse motion makes it easier for sounds to occur due to reversed force direction. This poses a risk of brake failure, especially when reversing downhill which doubles the danger. I recommend stopping to check visually first. If no foreign objects are found, test drive again. If the noise persists, visit a repair shop immediately for professional diagnostic tools. Regular brake cleaning and timely part replacements can prevent such problems.

[LeKaden]

Reverse braking noise is common in cars, especially on the rear brake discs. It may be due to aging brake pad materials or surface rust, which amplifies the friction sound under uneven force. In principle, the reverse direction changes the contact point between the brake disc and pads, making it more prone to noise. Check for uneven wear or dust accumulation and try cleaning it yourself. It is recommended to visit a professional repair shop for adjustment and installation, or replace parts if necessary. Over time, learn some brake maintenance tips, such as using a high-pressure water gun to clean the wheel hub area during each car wash.