Disc Brake Component Specifications

Application	Specification
Application	Metric	English
Front Brakes
Brake Rotor Diameter	310.0 mm	12.20 in
Brake Rotor Discard Thickness*	25.0 mm	0.98 in
Brake Rotor Maximum Allowable Assembled Lateral Runout	0.05 mm	0.002 in
Brake Rotor Maximum Allowable Scoring	1.50 mm	0.059 in
Brake Rotor Maximum Allowable Thickness Variation	0.006 mm	0.00024 in
Brake Rotor Thickness New	27.0 mm	1.07 in
NOTE: GM does NOT recommend any resurfacing of the park brake portion of the rear brake rotor. If light sanding will not remove the surface imperfections (rust/corrosion/pitting), the rotor should be replaced. Rear Brakes
Brake Rotor Diameter	324.0 mm	12.76 in
Brake Rotor Discard Thickness*	16.5 mm	0.650 in
Brake Rotor Maximum Allowable Assembled Lateral Runout	0.05 mm	0.002 in
Brake Rotor Maximum Allowable Scoring	1.50 mm	0.059 in
Brake Rotor Maximum Allowable Thickness Variation	0.006 mm	0.00024 in
Brake Rotor Thickness- New	18.0 mm	0.709 in
*All brake rotors have a discard dimension cast into them. Replace any rotor that does not meet this specification. After refinishing the rotor, replace any rotor that does not meet the discard thickness specification.