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Affordable Bolt-On Rear Disc Brake Kit: Upgrade your GM 10 and 12 bolt rear ends with this cost-effective bolt-on rear disc brake kit. Enjoy the convenience of a ready-to-install system without breaking the bank., Designed for Mid-Size Cars: Specifically engineered to fit GM 10 and 12 bolt rear ends in mid-size cars, this kit ensures compatibility and reliable performance. Please note that it is not suitable for full-size cars, pickups, or 7.5\" 10 bolt axles., Complete Kit for Easy Installation: This comprehensive kit includes everything you need for a hassle-free installation. It comes with two bolt-on caliper brackets, two vented rotors, two GM metric calipers, and all the necessary hardware for a seamless upgrade., Versatile Rotor Bolt Patterns: The rotors feature both 5 on 4-1/2\" and 5 GM 10 & 12 Bolt Bolt-On Rear Disc Brake Kit Sku # 91031919 Mfr. Part # 91031919 Condition New Brand Speedway Motors Sold Kit 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 GM metric calipers with or 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 GM Metric 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.
Specs Sold in Quantity Kit Notes Includes rotors, calipers, pads, hardware, and caliper brackets. 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 Rotor Type Vented Caliper Pistons One Caliper Finish Natural Parking Brake Provision No Minimum Recommended Wheel Diameter 15 Inch Rotor Shape Round Hardware Included Yes Rotor Style Plain Face Spindle Type No Value Rotor Thickness 1" Rotor I.D. 2.78" Rotor Backspace 2.3" Rotor Material Type Cast Iron 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 Ford Bearing End Style Not Applicable Rear Rotor Included Yes Finish Natural Color Natural Front Caliper Finish Natural Bolt Pattern 5 on 4.5" | 4.75" Reviews Yes I would buy it again Rated by John Lester on August 19, 2026
Summary: Have not installed this yet but all the parts quality.
Yes, I recommend this product.
I bought these to match my front brakes Rated by Gtotiger on July 03, 2026
Summary: Installation was good and they perform very well.
Yes, I recommend this product.
I would buy again Rated by Reaster on June 22, 2026
Summary: Easy to install
Yes, I recommend this product.
Good price Rated by Dave on June 16, 2026
Summary: Fast shipping
Highly recommend!! Rated by DogDish442 on October 26, 2025
Summary: Exact fit, easy bolt on, exactly as described with awesome quality!!
Yes, I recommend this product.
Related Items / Suggested Parts Dot Braided Stainless Brake Hoses, GM/Ford, 7/16-20 Rear Redline 80402 CV-2 Synthetic Grease Wilwood 290-0632 570 Brake Fluid, 12 oz Bottle Longacre 52-45198 Brake Bleeder Bottle w/ Magnet and Check Valve GM 10 & 12 Bolt Bolt-On Rear Disc Brake Kit w/ E-Brake Right Stuff AFXRD01 Rear Disc Brake Conversion Kit, Camaro/Nova Tech Support We\'re here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
