Weld-On Rear Disc Brake Kit, 1978-88 GM Caliper, 3 Inch Backspace
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Replace those old drum brakes with modern rear disc brakes. Mounts .81" x 11-3/4" Pro-lite vented iron rotors and calipers to 3" tube rear end. Complete with rotors, hats, metric calipers (7/16"-20 inlets), brackets, brake pads, caliper brackets and slider bolts.
Steel hat fits 5 lug hubs with 4-1/2", 4-3/4", or 5" bolt circle.
910-31931 Instructions (PDF)
Brake pad and caliper installation note:
This bracket features a 90 degree bend in the bracket at the slider bolt threaded area for additional caliper support. This part of the bracket may or may not interfere with the corner of the inner brake pad backing plate due to differences in brake pad manufacturers. When this occurs, it will be necessary to simply remove a minimal amount of backing plate material at each corner of the inner brake pad to allow for the necessary clearance between the bracket and brake pad when the caliper and pads are fully installed.
- Caliper Brackets (2)
- Weld onto a 3" axle tube
- Rotors (2)
- GM-style .81" x 11-3/4", 8 on 7" bolt pattern
- Straight vanes, 8 lbs. each
- Rotor Hats (2)
- Stamped steel, 3" backspace
- 3.06" center hole, 5.83" I.D., 1/2" stud holes, 2 lbs.
- Rotor Bolt and Nut Kit (2)
- Caliper Slider Bolts (4)
- Brake Pads (2 sets)
- Street compound, little metallic, long rotor and pad life
- Calipers - 1978-88 GM Metric (L & R)
- 7/16"-20 inlet
- Cast iron body, 2.38" single piston
- Saves 3.5 lbs. per side compared to '69-'77 GM calipers
What's In The KitEach kit from Speedway Motors is carefully packaged and delivered right to your door. Below is a list of all the items you should expect to receive when you order this kit. Some of these items may also be available for sale individually if you're here looking for replacement parts.
Weld-On 1978-88 GM Metric Caliper BracketPart # 91641010Qty x 2
Speedway Pro-Lite Vented Brake Rotor, 11.75 x .81 InchPart # 91031906Qty x 2
Speedway Stamped Steel Disc Brake Rotor Hat, 3 Inch OffsetPart # 91031904Qty x 2
Rotor Hat Bolt Set, 1/8 Inch ThickPart # 8352500071-1/8Qty x 2
Speedway GM Brake Caliper Slider Slide BoltPart # 8352300542Qty x 4
Speedway 156 1978-Up GM Metric Brake PadsPart # 9191562Qty x 2
IMCA 1978-1988 GM Metric Caliper, LH Left Hand, 7/16-20 Inlet, RacingPart # 91031045-LQty x 1
IMCA 1978-1988 GM Metric Caliper, Right Hand, 7/16-20 Inlet, RacingPart # 91031045-RQty x 1
Instruct Sheet-Brake KitPart # 910319INSTQty x 1
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