Disc Brake Component Specifications

WARNING: This page is about a different car, the 2018 Cadillac XTS. However, it is still accessible from the selected car via links, so may be relevant.

Application	Specification
Application	Metric	English
Front Rotor
Brake Rotor Diameter (J55)	330.0 mm	12.99 in
Brake Rotor Diameter (J64)	345.0 mm	13.58 in
Brake Rotor Discard Thickness* (J55, J64)	27.0 mm	1.07 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 (J55, J64)	30.0 mm	1.18 in
Rear Rotor
Brake Rotor Diameter (J55)	350.0 mm	13.78 in
Brake Rotor Diameter (J64)	315.0 mm	12.40 in
Brake Rotor Discard Thickness* (J55)	18.0 mm	0.709 in
Brake Rotor Discard Thickness* (J64)	21.5 mm	0.846 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 (J55)	20.0 mm	0.787 in
Brake Rotor Thickness- New (J64)	23.0 mm	0.905 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.