Brake Rotor/Disc: Specifications
Rotor ThicknessGM 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, JB9, 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) |