GM 10 & 12 Bolt Bolt-On Rear Disc Brake Kit
GM 8.2 Inch 10-Bolt BOP, GM 8.2 Inch 10-Bolt Chevy 64-72, GM 8.5 Inch 10-Bolt, Rear Position
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If you dont want to spend an arm and a leg on a rear disc brake kit and still have to weld the bracket on, weve got you covered. This complete kit includes two bolt-on caliper brackets, two 11-1/4" vented rotors, two GM metric style calipers, brake pads and hardware.
- Rotors have both 5 on 4-1/2" and 5 on 4-3/4" bolt circles
- Fits axle with a maximum flange diameter of 6-1/4" O.D.
- 2.780" rotor center hole
- Does not fit all 10 & 12 bolt axles. Check Application tab for details.
With non-emergency brake calipers.
This kit will fit 10 & 12 Bolt rear ends from:
The housing flange must have:
- 3-1/8" center-to-center distance for the top two bolt holes
- 2-11/16" center-to-center distance for the bottom two bolt holes
- 2-7/16" distance from the center of the top bolt to the center of the bottom bolt
Note: This disc brake kit does NOT fit all 10 & 12 bolt rear axles. It does NOT fit full size car (Biscayne, Bel Air, Impala) or pickup rear axles.
The inside diameter of this rotor will accept an axle flange that has a diameter of 6-1/4" or smaller. If your axle flange exceeds 6-1/4" in diameter, you will need machine your axle flange to decrease your axle flange diameter to fit this rotor as necessary.
When utilizing an aftermarket axle with disc brake conversion kits, it may be necessary to reduce the diameter of the axle flange to a diameter necessary to adequately fit inside the required Clearance I.D. that the brake hat/brake rotor will require. (see above diagram for illustration)
91031919 Instructions (PDF)
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What's In The Kit
Speedway GM Brake Caliper Slider Slide BoltPart # 8352300542Qty x 4
IMCA Approved 1978-88 GM Metric LH Brake Caliper, 7/16-20 InletPart # 91031045-LQty x 1
IMCA Approved 1978-88 GM Metric RH Brake Caliper, 7/16-20 InletPart # 91031045-RQty x 1
Speedway 156 1978-Up D154 GM Metric Brake PadsPart # 9191562Qty x 2
Caliper Brackets - GM 10 & 12 Bolt Bolt OnPart # 91031983Qty x 1
Caliper Bolt Kit - 910-31983Part # 91031983-2Qty x 1
Replacement 11-1/4 Inch Rear Brake RotorPart # 91031039Qty x 2
Q & A
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In this tech article, we discuss the pros and cons of the Ford 9-Inch and the Chevy 12 Bolt rear ends. Click here for our take on this classic debate.
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