Comprehensive Brake Upgrade Option Measurements
This page is designed for those interested in creating a brake setup with mixing and matching parts and for a general overview of
each brakes setup specifications. If you do not want to deal with patching together a custom setup then just go with one of the proven
C4, C5, LS1, or 1LE setups and skip to the next page.
I have created a table of the most common brake swaps and their basic specifications so some comparison can be made of the available
options. A lot more goes into picking a break setup then just going off the specifications below, so only use this table as reference.
This information should be very useful for people looking to upgrade the brakes on many GM cars.
Front Caliper Specifications Table
| Front Brake Type | Piston Size (outer diameter) |
# of Pistons per Caliper | Total Caliper Piston Surface Area (per caliper) |
Mounting Type | Rotor Thickness |
| Stock 82-92 F-Body | 2.375 in. | 1 | 4.43 sq. in. | Floating | ~1 in. |
| 88-92 F-Body 1LE | 1.5 in. | 2 | 3.53 sq. in. | Floating | 1.05 in. |
| 88-96 C4 Corvette NON-HD | 1.5 in. | 2 | 3.53 sq. in. | Floating | 0.81 in. |
| 88-96 C4 Corvette HD | 1.5 in. | 2 | 3.53 sq. in. | Floating | 1.11 in. |
| 98-02 4th gen F-Body "LS1" | 1.75 in. | 2 | 4.81 sq. in. | Floating | 1.25 in. |
| 97-04 C5 Corvette | 1.75 in. | 2 | 4.81 sq. in. | Floating | 1.25 in. |
| 05-09 C6 Std. | 40.5mm | 2 | 3.99 sq. in. 2576.5 sq. in |
Floating | 1.26 in. |
| 05-09 C6 J55, Z51 | 40.5mm | 2 | 3.99 sq. in. 2576.5 sq. in |
Floating | 1.26 in. |
| 06-09 C6 Z06 | 33mm | 6 | 7.95 sq. in 5131.79 sq. mm |
Fixed | 1.26 in. |
| 2009 C6 ZR1 Brembo |
38/34/30mm | 6 | Fixed | ||
| 04-07 Cadillac CTS-V Brembo |
40/44mm | 4 | 8.61 sq. in. 5554 sq. mm |
Fixed | 1.26 in. |
| 2010 Camaro SS Brembo |
4 | Fixed | 1.26 in. |
Rear Caliper Specifications Table
| Rear Brake Type | Piston Size (outer diameter) |
# of Pistons per Caliper | Total Caliper Piston Surface Area | Mounting Type | Rotor Thickness |
| 82-88 F-Body Iron | 48mm | 1 | 1810 sq. mm | Floating | |
| 89-92 F-Body Aluminum PBR | 40mm | 1 | 1257 sq. mm | Floating | |
| 88-96 C4 Corvette | 40mm | 1 | 1257 sq. mm | Floating | |
| 98-02 4th gen F-Body "LS1" | 45mm | 1 | 1590 sq. mm | Floating | |
| 97-04 C5 Corvette | 45mm | 1 | 1590 sq. mm | Floating | |
| 05-09 C6 Std. | 45mm | 1 | 1590 sq. mm | Floating | |
| 05-09 C6 J55, Z51 | 42mm | 1 | 1385 sq. mm | Floating | |
| 06-09 C6 Z06 | 30mm | 4 | 2827 sq. mm | Fixed | |
| 2009 C6 ZR1 Brembo |
30/34mm | 4 | 3230 sq. mm | Fixed | |
| 04-07 Cadillac CTS-V Brembo |
32mm 28mm |
4 | 2840 sq. mm | Fixed | |
| 2010 Camaro SS Brembo |
4 | Fixed |
Rotor Specifications
5 x 4.75 Bolt Pattern Rotor Specifications
| Front Brake Rotor | Front Rotor Specifications | |||||||
| Diameter | Thickness (nominal) |
Offset | Height | Hat Thickness (approximate) |
Hat Diameter (approximate) |
OEM Weight (approximate) |
OEM Part # | |
| 82-92 F-Body | 10.50" | 1.04" | 4.32" | 19.15 lbs | 18027687 | |||
| 88-92 F-Body 1LE | 11.85" | 1.04" | 4.65" | 25.0 lbs | 18027886 | |||
| 88-96 C4 Corvette NON-HD | 12.01" | 0.79" | 2.19" | 14.0 lbs | ||||
| 88-96 C4 Corvette HD J55 | 12.99" | 1.10" | 2.20" | 20.5 lbs | (L) 10052203 (R) 10052204 |
|||
| 98-02 F-Body "LS1" | 11.92" | 1.27" | 2.04" | 17.0 lbs | 18038817 | |||
| 97-04 C5 Corvette | 12.79" | 1.26" | 1.79" | 18.9 lbs | (L) 10445857 (R) 10445856 |
|||
| 05-09 C6 Std. | 12.80" | 1.26" | 1.77" | 19.5 lbs | 19175920 | |||
| 05-09 C6 J55, Z51 | 13.19" | 1.26" | 1.80" | 22.5 lbs | 89060328 | |||
| 06-09 C6 Z06 | 13.98" 355mm |
1.26" 32mm |
1.79" 45.5mm |
27.3 lbs | 19121787 | |||
| 09 C6 ZR1 (carbon ceramic rotor) |
15.5" | 25843121 | ||||||
| 2010 Camaro SS Fifth Generation (GM Zeta platform) |
13.98" 355mm |
1.26" 32mm |
||||||
Notes:
(1) The diameter, thickness, and offset do not very much from manufacture to manufacture as these are critical for proper alignment
within factory caliper carrier.
(2) Some measurements are labeled approximate because the tolerances are not critical to OEM fitment and therefore tolerances between
manufactures very.
Rear Rotor Specifications:
| Rear Brake Type | Rear Rotor Specifications | |||||||
| Diameter | Thickness (nominal) |
Offset | Height | Hat Thickness (approximate) |
Hat Diameter (approximate) |
OEM Weight (approximate) |
OEM Part # | |
| 88-92 F-Body PBR | 11.67" | 0.78" | 1.97" | 12.5 lbs | ||||
| 93-97 F-Body | 11.54" | 0.79" | 1.87" | 11.0 lbs | ||||
| C4 Corvette | 12.01" | 0.79" | 1.97" | 13.5 lbs | ||||
| 98-02 F-Body "LS1" (with built-in drum) |
12.01" | 1.02" | 2.41" | 15.5 lbs | ||||
| 97-04 C5 Corvette (with built-in drum) |
12.01" | 1.26" | 1.91" | 14.2 lbs | ||||
| 05-09 C6 Std. (with built-in drum) |
12.01" | 1.02" | 1.91" | 14.2 lbs | ||||
| 05-09 C6 Z51 (with built-in drum) |
12.99" 330mm |
1.02" 26mm |
1.94 49.3mm |
20.2 lbs | ||||
| 06-09 C6 Z06 (with built-in drum) |
13.36" 340mm |
1.02" 26mm |
1.94" 49.2mm |
21.1 lbs | 19121797 | |||
Notes:
(1) The diameter, thickness, and offset do not very much from manufacture to manufacture as these are critical for proper alignment
within factory caliper carrier.
(2) Some measurements are labeled approximate because the tolerances are not critical to OEM fitment and therefore tolerances between
manufactures very.
(3) Rotors with built-in drums have a parking brake drum in the center 'hat' area of the rotor, drum parking brakes hold the car much
better.
Master Cylinder Specifications
| Brake Type | Master Cylinder Specifications | |||||||
| Front Bore Diameter | Rear Bore Diameter | Front Port Fitting | Rear Port Fitting | Push Rod | Bore Exit Side |
Style | GM # ACDelco # |
|
| 82-83 F-Body Rear Disc | ~1.42" 36mm |
1" 25.4mm |
9/16"-18 INV | 1/2"-20 INV | Dimple | Left | Step Bore | 18030445 18M203 |
| 82-83 F-Body Rear Drum | 1.25" 31.75mm |
~0.945" 24.0mm |
9/16"-18 INV | 1/2"-20 INV | Dimple | Left | Step Bore | 18030446 18M204 |
| 84-88? F-Body (Note 1) | ~1.42" 36mm |
1" 25.4mm |
12x1 BBL | 11x1.5 BBL | Dimple | Left | Step Bore | 18030556 18M314 |
| 84-92 F-Body | 1.25" 31.75mm |
~0.945" 24.0mm |
12x1 BBL | 11x1.5 BBL | Dimple | Left | Step Bore | 18030555 18M313 |
| 93-94 B-Body HD | 1.25" 31.75mm |
12x1 BBL | 11x1.5 BBL | Dimple | Right | Single Bore | 18030883 18M641 |
|
| 95-96 B-Body | ~1.575" 40mm |
~1.126" 28.6mm |
12x1 BBL | 11x1.5 BBL | Dimple | Right | Step Bore | 18030951 18M709 |
| 95-96 B-Body HD | 1.25" 31.75mm |
12x1 BBL | 11x1.5 BBL | Dimple | Right | Single Bore | ||
| 98-02 F-Body "LS1" | 1" | 12x1 BBL | 11x1.5 BBL | Dimple | Left | Single Bore | 18060784 174787 |
|
Notes:
(1) 82-83 F-body master cylinders have a different thread and fitting then the later years F-bodies. It gets very confusing which
master cylinder is used on which car from 84-92 F-body, the parts list from each manufacture list different years and different applications.
From my research it appears the 18030556 part was only used on the 84-88 cars with rear disc brake and 18030555 was used on 84-88 cars
with rear drum brakes. It also looks like from 89-92 GM used the smaller drum brake master cylinder 18030555 on all f-bodies.
Some of the measurements data in the tables above is pulled from manufactures websites
Centric & Raybestos
Page created: January 2006
Page content last updated: 09-04-2009