1. Incorrect Wheel Size: Using wheels that are too wide or have an offset that is not correct for your vehicle can cause the caliper to rub against the rim. Make sure that the wheels are the correct size and offset for your vehicle.
2. Bent Caliper Mount: If the caliper mount is bent, it can cause the caliper to be misaligned and rub against the rim. Inspect the caliper mount for any bends or damage, and replace if necessary.
3. Worn Out Brake Pads: Worn out brake pads can cause the caliper to sit too close to the rim, causing rubbing. Replace the brake pads if they are worn out.
4. Stuck or Seized Caliper Piston: A stuck or seized caliper piston can prevent the caliper from fully retracting, causing the brake pads to rub against the rim. Try to free up the stuck piston by gently tapping it with a hammer and penetrating oil. If this doesn't work, the caliper may need to be rebuilt or replaced.
5. Faulty Caliper Brackets: If the caliper brackets that attach the caliper to the wheel hub are damaged or loose, it can cause the caliper to move and rub against the rim. Inspect the caliper brackets and bolts, and replace any damaged or worn components.
If the issue persists or you are unsure of the cause, it's best to consult with a qualified mechanic for a proper diagnosis and repair.
