* Worn brake pads: Even if they were recently replaced, cheap or low-quality pads can wear quickly and unevenly, leading to grinding. The metal backing plates of the pads grinding against the rotor is a common cause of this.
* Worn brake rotors: The rotors themselves might be scored, warped, or excessively worn. This can cause the pads to grind even with new pads installed.
* Caliper issues: A seized or sticking caliper piston can cause uneven pad wear and grinding. One piston might not be retracting properly, keeping a pad constantly pressed against the rotor.
* Improper installation: If the brakes weren't installed correctly, the pads might be misaligned or not seated properly. This can lead to uneven wear and noise.
* Foreign object: Sometimes, a small stone, piece of metal, or other debris can get lodged between the pad and rotor, causing a grinding sound.
* Rust or corrosion: Rust on the rotor's surface can create a rough texture that causes grinding, especially if the vehicle hasn't been driven much.
To diagnose the problem:
1. Inspect the brake pads: Check the thickness of the pads and look for uneven wear. Replace if necessary.
2. Inspect the brake rotors: Look for scoring, warping, or excessive wear. If damaged, they need to be resurfaced (machined) or replaced.
3. Check the calipers: Make sure the calipers are moving freely and the pistons are retracting properly. A seized caliper needs to be repaired or replaced.
4. Clean the brake system: Thoroughly clean the brake components to remove any debris or rust.
5. Check for proper installation: Ensure all components are correctly installed and aligned.
If you're not comfortable doing this yourself, take it to a qualified mechanic for a proper diagnosis and repair. Ignoring grinding brakes is dangerous and can lead to brake failure.
