GM 10 & 12 Bolt Bolt-On Rear Disc Brake Kit W/ Wilwood Calipers

#91096003

GM 10 & 12 Bolt Bolt-On Rear Disc Brake Kit W/ Wilwood Calipers

Bolt on rear disc brake kit for 10 and 12-bolt rear axles with no welding required
Substantial performance upgrade over stock drum brakes
Fits GM 10 and 12 bolt rear ends in midsize cars. Will not fit full size cars, pickups, 7.5" 10 bolt axles, or applications with staggered shocks

Caliper Type:

Wilwood

$738.99

/each

In Stock

$753.78

Save $14.79

Quantity

Need Help? Call to Order

Add to a list

Select a vehicle to verify Fitment

Select Vehicle

Product Summary

Rear Position, 11.25 Inch Rotor Diameter, Powder Coated

Bolt on rear disc brake kit for 10 and 12-bolt rear axles with no welding required
Substantial performance upgrade over stock drum brakes
Fits GM 10 and 12 bolt rear ends in midsize cars. Will not fit full size cars, pickups, 7.5" 10 bolt axles, or applications with staggered shocks
Includes two bolt-on caliper brackets, two vented rotors, two new D154 Wilwood calipers, pads, and hardware
Rotors have both 5 on 4-1/2" and 5 on 4-3/4" to accommodate a variety of wheels

Comes as a Kit

View Kit Components

See more details

Key Specs

MFG. Part #	91031919
Position	Rear
Wheel Bolt Pattern (in.)	5x4.5 in. \| 5x4.75 in.
Wheel Bolt Pattern (mm)	5x114.3 mm \| 5x120.65 mm
Rotor Diameter	11.25 Inch

See more specs

Need To Know

Need help?

855.313.9176

View the Help Center

Quick and Easy Returns

Return Policy

Speedway Motors 91031919 Details

Bolt on rear disc brake kit for 10 and 12-bolt rear axles with no welding required
Substantial performance upgrade over stock drum brakes
Fits GM 10 and 12 bolt rear ends in midsize cars. Will not fit full size cars, pickups, 7.5" 10 bolt axles, or applications with staggered shocks
Includes two bolt-on caliper brackets, two vented rotors, two new Wilwood D154 calipers without emergency brake, pads, and hardware
Rotors have both 5 on 4-1/2" and 5 on 4-3/4" to accommodate a variety of wheels
Fits axle with a maximum flange diameter of 6-1/4" OD and brake register size of 2.78" or smaller

Rear Disc Brakes for Performance and Safety

We tend to look back at the muscle car era of the 60's and 70's through rose-colored glasses. Everybody remembers lumpy solid lifter camshafts, big compression ratios, and blinding straight-line acceleration. But in the six decades or so that have passed since those big block-powered dinosaurs ruled the roads, we've gotten used to some modern performance and safety features that become conspicuous in their absence when we jump in the old Chevelle or Camaro for a trip across town. Those drum brakes that were just fine in 1969 can lead to some panic inducing near misses in modern traffic. To add some performance and peace of mind, don't drop the bucks on a rebuild of those archaic rear drum brakes. Instead, consider a bolt-on rear disc brake conversion that won't cost much more than a drum brake refresh, but will add some serious performance and safety to your GM midsize or ponycar.

Complete Bolt-On Rear Disc Brake Kit

Back in the day, only factory hot rods like the Z/28 were fitted with rear discs. The rest of the herd was saddled with heavy, fading rear drums. This Speedway Motors GM 10 & 12 Bolt Bolt-On Rear Disc Brake Kit makes it easy to bolt up the brake setup that was a trick high performance option when your GM midsize muscle car rolled off the line. This kit comes with everything needed to bolt the included Wilwood calipers on your 10 or 12-bolt GM rearend housing with no welding required. The caliper brackets in this kit simply bolt-on to the housing flange, making the install an afternoon job, not a full-on fabrication project. You can choose calipers with or without an emergency brake and the calipers come complete with brake pads and slide bolts. This kit also comes with a pair of vented 11-1/4" rotors. There may be bigger and more expensive rear disc brake kits out there, but this one delivers impressive performance at an affordable price while still looking more trick than those rusty old drums when viewed through big-inch Pro Touring-style wheels.

Application

Note that GM made many variants of the venerable 10 and 12-bolt rear. The brackets in this kit are configured to fit housings that do NOT have staggered shocks. There's a full list of applications below, but typically, you're going to find these in midsize cars like Chevelle and Cutlass from '64 into the 70's as well as first-gen Camaros and many years of Chevy II/Nova.

This kit is designed to fit 10 & 12 Bolt rear ends from:

1964-77 Buick Skylark
1964-73 Chevy Chevelle
1964-79 Chevy Nova/Chevy II
1964-77 Chevy El Camino
1967-69 Camaro
1970-77 Chevy Monte Carlo
1964-71 Oldsmobile 442
1964-77 Oldsmobile Cutlass
1964-73 Pontiac GTO
1964-77 Pontiac LeMans
1964-70 Pontiac Tempest

This kit is NOT designed to fit the following:

12-bolt truck rearends. (For truck applications, see 136159 Speedway 63-70 GM C10 Rear 6 Lug Disc Brake Kit or 136163 Speedway 63-70 GM C10 Rear 5 Lug Disc Brake Kit)
The later 7.5" 10-bolt (For 7.5" axles, check out 91031928 GM 7.5 Inch 10 Bolt Bolt-On Rear Brake Kit w/ E-Brake)
10 and 12-bolts in fullsize cars like the Caprice, Bel Air, and Impala. (For full-size rear disc kit, see 916645634 Speedway Rear Disc Brake Standard Kit, 55-68 Impala)
10 and 12-bolts with staggered shocks. (If your car is so equipped, our 916645629 Staggered Rear Disc Brake Kit, GM F/X Body, 10 & 12 Bolt is for you)

To verify that this kit will work on your axle, you can double check that the flange where the caliper bracket will bolt up has the following dimensions:

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

Also check that the axle flange where the lug studs are pressed on has an outside diameter that is no larger than 6-1/4" and a brake register (the raised part at the center) that is no larger than 2.78".

Features

Installation note:

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)

Guides & Documents

Disc Brake Pads Technical Information (9191562)

Speedway Motors 91031919 Specifications

KEY SPECS
MFG. Part #	91031919
Brand	Speedway Motors
Position	Rear
Wheel Bolt Pattern (in.)	5x4.5 in. \| 5x4.75 in.
Wheel Bolt Pattern (mm)	5x114.3 mm \| 5x120.65 mm
Rotor Diameter	11.25 Inch
Rotor Type	Vented
Caliper Pistons	Two
Caliper Finish	Powder Coated
Parking Brake Provision	No
Minimum Recommended Wheel Diameter	15 Inch
Rotor Shape	Round
Hardware Included	Yes
Rotor Style	Plain Face
Front Rotor Included	No
Front Rotor Diameter	11.25 Inch
Front Caliper Included	No
Rear Caliper Included	Yes
Front Spindles Included	No
Master Cylinder Included	No
Brake Booster Included	No
Brake Hoses Included	No
Rear Rotor Included	Yes
Bolt Pattern	5 on 4.5" \| 4.75"

GENERAL
Sold in Quantity	Kit
Notes	Includes rotors, calipers, pads, hardware, and caliper brackets.
Rotor Thickness	1"
Rotor I.D.	2.78"
Rotor Backspace	2.3"
Rotor Material Type	Cast Iron
Caliper Material Type	Aluminum

Ratings & Reviews

Be the first to write a review.

Questions & Answers

Be the first to ask a question.

Fitment

1964-1977 Buick Skylark

1967 Chevy Camaro

1964-1973 Chevy Chevelle

1964-1968 Chevy Chevy II

1973-1977 Chevy El Camino

1973-1977 Chevy Malibu

1970-1972 Chevy Monte Carlo

1969-1979 Chevy Nova

1964-1971 Oldsmobile 442

1964-1977 Oldsmobile Cutlass

1964-1973 Pontiac GTO

1964-1977 Pontiac LeMans

1964-1970 Pontiac Tempest