Disc Brake Component Specifications

WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Application	Specification
Application	Metric	English
Front Brakes - SRW, DZW
Rotor Discard Thickness*	38.5 mm	1.516 in
Rotor Minimum Allowable Thickness After Refinish	39.0 mm	1.535 in
Rotor Thickness (NEW)	40.0 mm	1.575 in
Rotor Maximum Allowable Assembled Lateral Runout	0.05 mm	0.002 in
Rotor Maximum Allowable Scoring	1.50 mm	0.059 in
Rotor Maximum Allowable Thickness Variation	0.025 mm	0.001 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 - SRW
Rotor Discard Thickness*	32.5 mm	1.280 in
Rotor Minimum Allowable Thickness After Refinish	33.0 mm	1.299 in
Rotor Thickness (NEW)	34.0 mm	1.339 in
Rotor Maximum Allowable Assembled Lateral Runout	0.05 mm	0.002 in
Rotor Maximum Allowable Scoring	1.50 mm	0.059 in
Rotor Maximum Allowable Thickness Variation	0.025 mm	0.001 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 - DZW
Rotor Discard Thickness*	38.5 mm	1.516 in
Rotor Minimum Allowable Thickness After Refinish	39.0 mm	1.535 in
Rotor Thickness (NEW)	40.0 mm	1.575 in
Rotor Maximum Allowable Assembled Lateral Runout	0.05 mm	0.002 in
Rotor Maximum Allowable Scoring	1.50 mm	0.059 in
Rotor Maximum Allowable Thickness Variation	0.025 mm	0.001 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 minimum thickness specifications.