Here are some reasons why your car might be screeching when you brake:
1. Worn-Out Brake Pads: The most common cause of screeching brakes is worn brake pads. As brake pads wear down, they become thinner and the amount of friction material on them decreases. This can cause the pads to make a scraping or screeching noise when they come in contact with the brake rotor.
2. Brake Rotor Issues: Brake rotors can also cause screeching noises. If the brake rotors are warped, pitted, or have other damage, they can create a rough surface that the brake pads scrape against. This can produce a screeching or squealing noise.
3. Incorrectly Installed Brake Pads: If brake pads are installed incorrectly, they can also cause a screeching noise. For example, if the pads are not properly seated or if the shims are not used, the pads can vibrate and make a screeching noise.
4. Lack of Lubrication: If the brake pads or rotors are not properly lubricated, they can also make a screeching noise. Lubricant helps to reduce friction between the pads and rotors, which can prevent screeching.
5. Brake Fluid Issues: In some cases, brake fluid issues can also cause screeching brakes. If the brake fluid is old or contaminated, it can cause the brake components to corrode and deteriorate. This can lead to screeching noises when you brake.
If your car is screeching when you brake, it's important to have the brakes inspected as soon as possible. If the cause is worn brake pads, they will need to be replaced. If the brake rotors or other components are damaged, they will also need to be repaired or replaced.
