Faulty Wheel Bearing:
- A worn-out wheel bearing can produce grinding and thumping sounds, especially when applying the brakes. Check the wheel bearings for any play or roughness.
Uneven Brake Rotor:
- Excessive wear or warping of the brake rotors can cause a thumping sound during braking. While your mechanics may have inspected the brakes, check the rotors closely for any irregularities.
Faulty Brake Caliper:
- Issues with the brake calipers, such as a failing piston or caliper pin, can lead to uneven brake pad pressure and cause the grinding and thumping noise. Inspect the calipers for any damage or issues.
Loose Brake Components:
- Ensure that all brake components, including calipers, bolts, and brackets, are properly tightened and secured. Loose components can vibrate and create thumping sounds during braking.
Suspension-related issues:
- Problems with the suspension, such as worn-out bushings or ball joints, could also cause thumping noises when braking.
Driveline Problems:
- In rare cases, the noise could indicate a problem with the driveline, such as a driveshaft issue or a failing universal joint.
Note:
In addition to the suggestions above, it's recommended to seek a second opinion from another trusted mechanic, as there may be other factors affecting the vehicle's brakes or other components that contribute to the thumping and grinding sound during braking.
