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Here are the part numbers that will come in handy when upgrading your third generation F-body brakes.
Thirdgen F-body to Corvette C4 Y-Body Front Brake Upgrade Part Numbers
| 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 | |
82-92 Thirdgen F-body to Fouthgen F-body "LS1" 98-02 Front Brake Upgrade Part Numbers
| 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 | |
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Page created: January 2006
Page content last updated: June 2009
will the “LS1″ brakes clear 15” rims?
They should fit in most rims.
Luke, first off great site,, your work speaks for itself. Outstanding to me!! Thanks for publishing..
I am working on doing the CTS-V rear calipers four-pot 2007
on my 2009 Impala SS, W-body Fronts we have done, I’m looking to get the rears to fit/work with the complete E-brake set-up to pass State inspection here in Va. I figure I have a rotor that should work the bracket seems to be the issue and looking to save a bit on Machine shop time if-Possible…
Any thoughts or ideas would be terrific, thanks in advance if you have the time to reply and have a great holiday!
Respectfully,
Bryan
Hi Luke, I have a third gen, I run the Roval at Fontana speedway, long story short, I have car balanced on corner weights within 7lbs.
Bent the Spohn caster/camber plates because I bottomed out hard in the esses (car lowered for balance), looking for a shorter strut, heading towards Ohlins, I’m trying to find the lower strut mount dimensions that attaches to the spindles.
I can see Ohlins makes several up right brackets that thread onto their shocks, I’m looking to cross over to something, do you have those dims?
TXs
Dennis
Hello Sir, May I start by saying thank you for putting such great information on the subject of Big Brake Upgrade .!! My question is do you or are they posted in here somewhere else the part numbers for the Ls1 brake installation for all G-Body rear wheel drive cars have looked and sooo much and came up empty for the part numbers of the calipers and brackets and hardware and backing plates and brake lines if you could please help me that be GREATLY appreciated I want to upgrade my 1984ss Monte Carlo with the Ls1 brake system on the rear there’s plenty of information on the front’s..
Hello Luke,
I found your site on the net and also read your reports in Third Gen.org. I am from Northern Germany and own a TransAm GTA 1990 and a Camaro 5.0 TPI Conv. 1988, I want to convert the front to 1 LE brake. I’ve had the 12 “discs (OEM) and calipers (PBR reb) for a long time.
Special difficulties make me the holder of the calipers (caliper Anchor) and the holder (mounting bracket) on the spindles.
Do you have a recommendation for me where I can also buy these parts individually.
Greetings from Germany
Jens H.