1. Improper installation: If the brake pads are not installed correctly, they can rub against the rotor and cause a screeching noise. Make sure the brake pads are properly aligned and seated in the caliper.
2. Glazed brake pads: When brake pads overheat, they can become glazed, which means that the friction material becomes hard and smooth. This can cause a screeching noise when braking. To fix this, the brake pads will need to be replaced.
3. Contaminated brake pads: If the brake pads become contaminated with oil, grease, or other substances, they can make a screeching noise. Clean the brake pads with brake cleaner and make sure they are free of any contaminants.
4. Worn brake rotors: If the brake rotors are worn, they can cause a screeching noise when braking. This is because the brake pads are not able to grip the rotors properly. To fix this, the brake rotors will need to be replaced.
5. Rusty brake components: If the brake components, such as the calipers, rotors, or pads, are rusty, they can make a screeching noise. Clean the brake components with brake cleaner and apply a rust inhibitor to prevent future rust.
6. Moisture on brake pads: When the brake pads are wet, they can make a screeching noise when braking. This is because the water creates a layer of lubrication between the brake pads and the rotors, which reduces friction. The screeching noise will usually go away once the brake pads are dry.
If the noise persists after you have checked all of the above, it is best to have your brakes inspected by a qualified mechanic.
