Why is there abnormal noise after changing the brake pads?

[HavenDella]

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.

[DiQuinn]

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.

[EmersonDella]

Last time I changed my brake pads, the car squealed every time I braked. At first, I thought they were broken and got scared, but later learned it's part of the break-in process for new pads. New brake pads need time to adapt to the rotors, and the noise naturally disappears after driving a few hundred kilometers. Misaligned installation angles can also cause screeching sounds. If the noise persists, it might be due to incorrect pad size or improper installation. If you're unsure how to check, quickly take it to a repair shop for re-inspection. Don't delay on safety-critical issues—abnormal noises can affect braking distance and lead to accidents. During maintenance, ensure you use OEM-matched pads and start with gentle braking to promote smoother break-in.

[AndresMarie]

Brakes are the lifeline of safety, and I become alert whenever there's abnormal noise after changing the pads. Improper installation might cause the pads to tilt and rub unevenly against the disc, creating noise. Initial noise during the break-in period of new pads is normal but should gradually fade. Persistent sharp noises indicate installation or quality defects that need prompt attention. Immediately slow down, pull over, and check for loose screws. If unsure about diagnosis, seek a professional shop. Delaying action on abnormal noises can worsen wear and increase risks.

[DeDaniela]

I once changed the brake pads myself, and later encountered abnormal noises, which are usually caused by uneven installation. Inspection steps: Remove the wheel to check if the pads are aligned with the disc surface for any tilting or dirt; clean any debris from the braking system; when reinstalling, press the caliper firmly to ensure it's level. During the break-in period, drive gently and avoid sudden stops to promote even surface wear. If the noise persists, check the compatibility and quality of the pads. Safety first—if you're not confident in your skills, go to a repair shop to avoid potential hazards. For preventive maintenance, choose high-quality pads and regularly inspect the wheel components.

[Luke]

As a veteran driver with decades of experience, encountering noise with new brake pads is common. The shiny surface of new pads requires bedding-in, and the initial squeaking usually fades after a few hundred kilometers of driving—gentle deceleration can speed up this process. Persistent noise may indicate loose installation causing pad slippage or size mismatch, requiring inspection and adjustment. Avoid harsh braking to extend pad lifespan. Continuous noise or poor-quality pads necessitate replacement to prevent rotor damage. Maintenance tip: Ensure calipers are securely fastened during pad changes, and address minor issues promptly to save on major repair costs.