Useful Part Number
Here are the part numbers you will need to upgrade your third generation F-body brakes.
| Thirdgen F-body to Corvette C4 Y-Body Front Brake Upgrade Part Numbers | |||
| Qty. | GM Part # | AC-Delco # | |
| 1989-1994 12-Inch Front C4 NON-HD Corvette Setup | |||
| Left Caliper (JL9) | 1 | 12520229 | 172-2139 |
| Right Caliper (JL9) | 1 | 12520230 | 172-2140 |
| Left Caliper Carrier (JL9) | 1 | 10181205 | |
| Right Caliper Carrier (JL9) | 1 | 10181206 | |
| C4 Left Rear Rotor (JL9) (See Note) |
2 | 18A288 | |
| OR | |||
| C4 Left Rear Rotor (Performance) |
1 | 18A1052 | |
| C4 Right Rear Rotor (Performance) |
1 | 18A1053 | |
| 1989-1996 13-Inch Front C4 HD Corvette Setup | |||
| Left Caliper (J55) | 1 | 12520231 | 172-2141 |
| Right Caliper (J55) | 1 | 12520232 | 172-2142 |
| OR you can use the GS caliper | |||
| Left Caliper (GS, Z15, Z16) | 1 | 12528689 | 172-2121 |
| Right Caliper (GS, Z15, Z16) | 1 | 12528690 | 172-2122 |
| Left Caliper Carrier (J55) | 1 | 10181207 | |
| Right Caliper Carrier (J55) | 1 | 10181208 | |
| Left Rotor (J55) | 1 | 10052203 | 177-678 |
| Right Rotor (J55) | 1 | 10052204 | 177-679 |
| 1LE rotor (For Hub) | 2 | ||
| Parts For Both Setups | |||
| Brake Pads (Standard) | 1 | 12518935 | 171-735 |
| Brake Pads (Performance) | 1 | 12480043 | |
| Caliper Carrier Bolt | 4 | 14084051 | |
| Caliper Carrier Washers | 4 | 10268875 | |
| Top Spindle Bracket Bolt 12mm x 1.75 pitch x 45mm long |
2 | ||
| Bottom Spindle Bracket Bolt 12mm x 1.75 pitch x 30mm long |
2 | 11508133 | |
| Brake Hose Gasket (Copper Washers) |
4 | 10139097 | |
NOTE: C4 Rear rotors are used on camaro C4 NON-HD 12-inch brake upgrades due to the rotor offset. This allow for the factory rotor to be turned down into a hub. Using a front rotor requires a larger offset hub, like the 1LE F-body, for clearance which is done on the C4 HD 13-inch brake upgrades.
| 82-92 Thirdgen F-body to Fouthgen F-body "LS1" 98-02 Front Brake Upgrade Part Numbers | |||
| Qty. | GM Part # | AC-Delco # | |
| Left Caliper | 1 | 18042491 | |
| Right Caliper | 1 | 18042492 | |
| OR you can use stronger C5 caliper | |||
| C5 Left Caliper | 1 | 88895128 | |
| C5 Right Caliper | 1 | 88895129 | |
| F-body Caliper Carrier (abutment bracket) |
1 | 18026163 | |
| Left Rotor | 1 | ||
| Right Rotor | 1 | ||
| Factory 82-92 Rotor (for hub) |
2 | ||
| Parts For Both Setups | |||
| Brake Pads (Standard) | 1 | ||
| Brake Pads (Performance) | 1 | ||
| Caliper Bolt | 4 | ||
| Top Spindle Bracket Bolt 12mm x 1.75 pitch x 45mm long |
2 | ||
| Bottom Spindle Bracket Bolt 12mm x 1.75 pitch x 30mm long |
2 | 11508133 | |
| Brake Hose Gasket (Copper Washers) | 4 | 10139097 | |
NOTE: You use the C5 caliper with the LS1 rotor and LS1 brake setup, you will need to use the F-body caliper carriers (abutment bracket) NOT the C5 caliper carriers (abutment bracket). The C5 and LS1 calipers are interchangeable but the C5 caliper is built to be stiffer due to the ribs on it and the casting method.
Page created: January 2006
Page content last updated: 06-17-2009