Brake Rotor/Disc

Rotor Thickness
GM brake systems are identified by Regular Production Option (RPO) codes. For further information on RPO codes see Application and ID.

	RPO JB1, JB3	RPO JB5, JB6, JB7, JD3, JD5, JD6, JD7	RPO JB8, JF9
Nominal Thickness	1.04 Inch (in)	1.28 Inch (in)	1.53 Inch (in)
Minimum Refinish Thickness	0.98 Inch (in)	1.23 Inch (in)	1.48 Inch (in)
Discard Thickness	0.965 Inch (in)	1.215 Inch (in)	1.465 Inch (in)