+
How often should I have my brakes serviced or inspected?
You should have your brakes serviced or inspected at least every 7,500 miles. It’s important to keep in mind that brake components wear out at different intervals and under different driving conditions. So, if you notice noises such as squealing, chirping and grinding, as well as pedal pulsations, come in for service.
+
What brake components wear out?
Brake calipers, brake pads, brake rotors, brake shoes and brake hoses will all need to be repaired or replaced at some point as part of regular brake service and maintenance during the normal lifespan of a vehicle.
+
Do I always need to turn or replace my vehicle’s rotors when changing the brake pads?
No. If there are no conditions such as pedal pulsation or steering-wheel vibration during braking, and the brake rotor is at least 1 mm thicker than the discard thickness, then it does not need to be turned or replaced.
+
How do I know when I need new brakes?
GM Brake pads are equipped with wear indicators that produce a squealing noise when the brakes are almost worn out. The noise may be present with or without the brake pedal applied, but when noise is heard from the wear indicator, the brake pads should be replaced as soon as possible. Wear indicators are set to create noise when around 2 mm of brake pad friction material thickness remains. In the case of assessing pad wear through inspection, pads should be replaced at or before a 2 mm thickness is reached.
Rotors should be replaced before they reach this minimum thickness and should not be turned below this.
+
Must I always turn or replace my rotors when changing my pads?
No. If there are no conditions such as pedal pulsation or steering-wheel vibration during braking, and the brake rotor is at least 1 mm thicker than the discard thickness, then it does not need to be turned or replaced.
+
Why does my brake pedal pulse?
Brake-pedal pulsation and other conditions, such as steering-wheel shaking while braking, are caused by thickness variation in the brake rotor. When a thicker spot of the rotor rotates through the caliper, it pushes back against brake fluid, which can be felt at the brake pedal. The brake fluid and pedal then relax again as the thick spot exits the caliper. This process produces pedal pulsation and “brake torque variation,” which can shake the steering wheel and seats. The warping of the disc does not cause brake pulsation. However, disc distortion due to excessive temperatures or improper installation and torquing of the wheels can lead to brake rotor thickness variation over time. Brake-pedal pulsation is corrected by turning and/or replacing the brake rotors to eliminate the thickness variation.
+
Why do my brakes squeal? How can I stop it?
Brake squeal is caused by the high-frequency vibration of brake components (rotor, calipers, and/or pads) in response to excitation from the brake friction process. Much time and engineering goes into eliminating brake squeal from original equipment brake components. Brake components are engineered as a complete system—factory-original performance can only be assured when using original equipment brake pads and rotors. When a brake squeal occurs, there may be damage or excessive wear on one or more components affecting noise, including the brake pads, the noise-damping shim that is bonded to the brake pad, or the rotor friction surface.
In addition, it should be recognized that high-performance and track-capable brake systems using high-performance pad materials may be at higher risk for producing brake squeal noise, even when no damage to the components is present.