Brake Rotor/Disc

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

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