Enhanced Braking Power: Upgrade your Mustang II to superior braking with 11″ rotors paired with powerful single piston GM metric floating calipers, significantly improving stopping performance over the stock 9 1/4″ rotors., Easy Installation: This complete brake kit offers a simple bolt-on conversion that requires no machining, complete with detailed instructions, making it accessible for both professionals and DIY enthusiasts., Comprehensive Kit Components: Includes everything needed for a full upgrade—new rotors, calipers, rubber brake hoses, brackets, bearings, seals, pads, and all necessary hardware., Vehicle Compatibility: Specifically designed for ’74-’80 Ford Pinto or Bobcat and ’74-’78 Mustang II spindles, ensuring a perfect fit and optimal function for these vehicle models., Wheel Mustang II Complete 11 Inch Brake Kit, Ford 5 x 4-1/2 Bolt Pattern Sku # 91031944 Mfr. Part # 91031944 Condition New Brand Speedway Motors Sold Kit Details Info Calipers- Uses common 7/16-20 SAE thread fluid inlet for larger brake hose compatibility Caliper features low-drag piston seal and piston dust seal for long life/street use Available as left or right side casting, only buy what you need for service/repairs Uses commonly found FMSI D154 reference number disc brake pads No core charge required and no need to ship your old calipers back Designed for 1.00-inch thick disc brake rotors (can fit .810-inch rotor with pad spacer) Uses 5-1/2-inch bolt spacing mounting pattern Brake pads, brake hoses, and caliper slide bolts sold separately Stop Effectively with Our IMCA Approved GM Metric Disc Brake Calipers Spec class racing removes a lot of the “wallet racing” by equalizing the racing equipment and focusing on the racer’s abilities. Having rules that specify specific parts, weights, dimensions, and more means everyone, theoretically, is running the same car with the same performance, making the race more about driver skill and race strategy. It is a great, cost effective, way to go racing while being competitive and having some fun. One such spec item the IMCA mandates for many of their racing classes, including Modifieds, Hobby Stock, and others, is the use of the ’78-’88 GM Metric caliper. Having the same caliper body and piston size as an approved IMCA part means everyone has the same braking system capability. The issue has been finding a good GM Metric caliper though. Parts store remans are iffy at best, often being remanufactured with substandard parts, and requiring core charges or turning in your old calipers. We opted to craft a brand new reproduction steel brake caliper that meets all the class rules for IMCA approval but can also be used on the street with any aftermarket brake system that specs these GM Metric calipers for their brake kit. Brand New Casting with Low Drag Piston Seal and Street Friendly Dust Seals When we designed our IMCA approved GM Metric disc brake caliper we realized the majority of the sales would come from racers, but we also wanted to ensure that this disc brake caliper could be used in road going applications, as this brake caliper is very popular in rear disc brake conversions and for custom installations using , either application specific or universal clamp-on or weld on options. To that end, we fitted the 2-3/8-inch diameter piston with a low drag piston seal that retracts the piston slightly, pulling the brake pads away from the rotor for better fuel economy. Furthermore, standard piston dust seals are included in our brake caliper casting for extremely low maintenance requirements. These disc brake pistons are designed to fit best with 1-inch wide disc brake rotors but will work with .810-inch rotors as well when fitted with our . When designing these new Metric calipers, we did change the fluid port to the much more common 7/16-20 thread. This opens up your brake hose and banjo bolt/fitting options immensely for custom applications. Our 16-inch is a great option that will work for most applications, but we offer several different in various lengths for your project needs. We do not include brake caliper slide bolts and highly recommend our (two per caliper) that does not use the factory slide bolt bushings in the caliper. These GM Metric calipers use readily available replacement or performance found under the FMSI D154 pad shape reference number. Upgrade your Mustang II based suspension from the stock 9-1/4″ rotors to our 11″ rotors with powerful single piston GM metric floating calipers. This simple bolt-on conversion requires no machining. For use on 1974-80 Pinto, Bobcat and Mustang II spindles. Features a 5 on 4-1/2″ Ford/Mopar wheel bolt pattern (increases track width 1/2″ per side). Includes two 16″ front brake hoses and 7/16″-20 banjo bolts with crush washers. Note: 14″ wheels will require clearance to be checked as not all 14″ wheels will clear caliper Brake Pads- Speedway soft brake pad for GM Metric 1978-Up. Powder-coated backing plates help prevent corrosion Multi-layered OE style shim provides quieter braking(where applicable) Friction material matched to your vehicle’s OE standards Provides reliable performance Sold as one set of 4 (ST); outfits two calipers. Learn how to properly Bed-In your brake pads by reading our tech article. Bearings & Seals- Works with Mustang II/Pinto and Granada rotors using Mustang II/Pinto spindles only. It will not work for installing Mustang II/Pinto brake rotors on 1949-1954 Chevy spindles. Not for use with early Chevy spindle brake conversion kits. -Large Bearing- Thickness: .656″ Upper OD: 1.900″ Lower OD: 2.150″ Bearing ID: 1.375″ -Small Bearing- Thickness: .651″ Upper OD: 1.380″ Lower OD: 1.570″ Bearing ID: 0.864″ For Mustang II/Pinto and Granada rotors using Mustang II spindles. IMCA Approved. Charts (PDF) Specs Sold in Quantity Kit Bolt Pattern 5 on 4.5″ Finish Natural Rotor Diameter 11 Inch Caliper Finish Natural Rotor Shape Round Rotor Style Plain Face Color Natural Notes Includes rotors, bearings and seals, calipers, pads, brake hoses, brake tabs, and caliper brackets. Thread Pitch 1/2″-20 Hardware Included Yes Parking Brake Provision No Centerline of Holes 5.50 Stud Length 1.29 Stud Diameter .50 Rotor Thickness .88 Position Front Front Caliper Finish Natural Front Rotor Included Yes Front Caliper Included Yes Rear Rotor Included No Rear Caliper Included No Front Spindles Included No Master Cylinder Included No Brake Booster Included No Rotor Type Vented Rotor Material Type Cast Iron MFG. Part # 91031944 Caliper Pistons One Front Caliper Piston Quantity 1 Front Rotor Diameter 11 Inch Reviews Great Brake Upgrade Rated by Bruce on October 11, 2021 Summary: Going in a V-8 Pinto. Brake size should be adequate for a 2000 lb car, The upgrade gives you 5 lug rotors, everything is a bolt-on – no fab, welding or machining required (saves time!), the parts appear to be high quality, and all for a fraction of the cost of fancy aftermarket brakes… Very pleased Yes, I recommend this product. I would buy again Rated by RR1955 on July 12, 2021 Summary: Upgraded brakes Yes, I recommend this product. Nice kit Rated by Cobra on June 25, 2021 Summary: I have used this kit several times and I am very happy with the ease of install. Please keep it available. Yes, I recommend this product. Great Design Rated by Rusty coupe on June 09, 2021 Summary: Fairly simple to figure out. Lay the parts out and go from there. Yes, I recommend this product. Perfect product easy to mount Rated by Aurora Cob on May 08, 2021 Summary: Everything is in the kit and products are of good quality. Easy to mount even on a fourty years old Aurora GRX. And it brakes ! Yes, I recommend this product. 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If you have a question or need assistance with one of our products, please contact us through eBay 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 72 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.