Possible causes of grinding noise when braking with an automatic transmission:
1. Worn brake pads:
* Worn pads create a metallic grinding sound when they contact the brake disc.
2. Dirty brakes:
* Dirt, dust or rust on the brake pads or rotors can cause grinding noises.
3. Overheated brakes:
* Excessive use of the brakes, such as when descending a steep mountain, can cause the brake system to overheat and cause grinding noise.
4. Worn brake discs:
* Warped or worn brake rotors can create an uneven surface, resulting in grinding noise when braking.
5. Worn transmission parts:
*In some cases, grinding noises can be caused by worn transmission parts such as gears or bearings.
6. Problems with ABS:
* Malfunctions in the anti-lock braking system (ABS) can result in grinding noise when braking.
What to do:
* Check brake pads and rotors: Inspect them for wear or contamination and replace if necessary.
* Clean your brakes: Use brake cleaners to remove any dirt, dust or rust from your brake pads and rotors.
* Allow the brakes to cool: After using the brakes for a long time, give them time to cool.
*Consult a mechanic: If the problem persists, contact a qualified mechanic for diagnosis and repair.