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What Causes Abnormal Noise When Braking Hard?

2 Answers

LaZoe

07/30/25 1:36am

Abnormal noise when braking hard may be caused by rust on the brake discs or brake pads, or excessive wear of the brake discs and brake pads. Rust on Brake Discs: After parking for a long time, especially in humid weather or after rain, some rust or dirt may appear on the brake discs or brake pads. This issue can usually be resolved by driving for a while, or by applying butter or specialized lubricating oil to the connection between the brake pads and brake calipers. Rust on New Brake Pads: If there is noise when braking in a new car or after replacing the brake pads, it is because the new brake pads and brake discs need a break-in period. The noise during braking is completely normal. Excessive Wear of Brake Discs and Brake Pads: Brake discs and brake pads are high-wear items. Every time you brake, these two components rub against each other, leading to natural wear over time. When they become excessively worn, abnormal noise will occur. Therefore, regular inspection and replacement are necessary.

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VanEverly

08/15/25 7:22am

I've been driving for many years and have encountered the issue of abnormal noises during hard braking several times. Common causes include excessively worn brake pads, where the metal parts directly rub against the brake disc when braking hard, producing a screeching sound; or the brake disc may be deformed, leading to an uneven surface that causes vibration noise; accumulated dust and debris in the braking system can also produce noises under heavy pressure; another possibility is that the brake caliper has become loose or is not functioning smoothly. I remember once having to brake hard on the highway, and the squealing sound was terrifying. Later, the mechanic said the brake pads had worn down to the backing plate and recommended checking and replacing them every 20,000 kilometers. Brake issues are critical and shouldn't be ignored until the noise becomes louder, as this can dangerously extend the braking distance. It's important to go to a professional repair shop for a comprehensive inspection at the first sign of trouble to ensure safety.

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