Why is there abnormal noise after changing the brake pads?
2 Answers
The reasons for abnormal noise after changing the brake pads are: 1. If there is a squeaking sound from the newly replaced brake pads, it is recommended to check at a 4S shop. If there is a "metal-on-metal" hissing sound when lightly applying the brakes, it might also be due to the initial break-in effect after installation. In this case, the brake pads must be replaced immediately; 2. Some low-quality brake pads may have hard spots, which can also cause abnormal noise. This type of noise usually disappears after some time of wear. Automotive brake pads, also known as automotive brake linings, refer to the friction materials fixed on the rotating brake drums or brake discs of the wheels. The friction linings and blocks bear external pressure to generate friction, thereby achieving the purpose of vehicle deceleration.
I've changed many brake pads, and the main cause of squeaking is uneven friction due to improper installation. New pads have smooth surfaces and may produce normal noises during the break-in period of a few hundred kilometers, but these sounds will gradually fade. If the noise persists after the break-in period, it could be due to poor-quality pads or incompatibility with the original vehicle system, causing vibrations. Not cleaning the calipers or leaving iron filings and debris on the discs during installation can also accumulate noise. It's recommended to drive gently for a few days to observe if the noise subsides. If it continues, return to the repair shop to check the caliper position or replace with qualified parts. Safety first—ignoring the noise can wear down the discs, increase repair costs, and even reduce braking effectiveness. Choosing reliable brand pads and ensuring professional installation can prevent this issue.
