What does it mean when your brakes make a squealing noise? There are actually several things to check when your brakes start squealing.
Chances are the first thing you should check is the thickness of your brake pads. Many GM brake pads have indicators built into them that
actually cause them to squeal when the pads are running too thin. Some semi-metallic brake pads will naturally squeal due to the material used
to manufacture them. If you've actually waited too long to maintain or replace your brake pads, you could be getting metal to metal contact which
will cause squealing and/or a grinding noise coming from the bare brake pads and rotors contacting each other.
Another cause of squealing brakes is foreign material getting lodged in between the brake pads and rotors. To fix this, you'll need to remove the brake pads and clean them thoroughly. If the brake pads have been damaged, replace them with a new set. Also check for glazing of the brake pads. This can also cause squealing. Squealing brakes can also be caused by rusty brake mounting contact points. To remedy this, you'll need to apply a special silicone brake lubricant to the contact points causing the squealing. You can find this brake lubricant at most auto parts stores. Some brakes include anti-rattle clips to prevent noises from the brakes. Make sure your vehicle has them installed if applicable. Make sure the brake pads and rotors haven't been exposed to leaking brake fluid. There are a host of other less common things that can cause brakes to make squealing noises, but the summary above is some of the most common problems and should once again get you back into a vehicle with quiet brakes.