Economical, lightweight brake kit for straight axle hot rods with machined ’49-’54 Chevy car spindles, Your spindles must be machined or use our reproduction forged spindles, Uses 9 1/4″ Mustang II rotors (5×4-1/2 bolt pattern) with common GM Metric calipers, Includes new rotors drilled with Ford bolt pattern, new calipers, bearings, seals, brackets, hardware, and brake hoses, Not for ’49-’54 cars and will not work with ’49-’54 GM truck spindles 9.25″” GM Metric Disc Brake Kit to 1949-54 Chevy Car, 5×4.5″” BP Sku # 91031955 Mfr. Part # 91031955 Condition New Brand Speedway Motors Sold Kit Details Info Works on all 1949-1954 GM car spindles that have been machined per the included instructions For straight axle hot rod builds only, not for use on 1949-1954 GM car use This kit will not work with stock steering arms, and you must use aftermarket arms Not for use with 1949-1954 GM truck spindles Will work with Speedway Motors forged 1949-1954 GM car spindles with no machining required Disc brake style wheels are required for proper caliper clearance when upgrading from drum brakes Single 2-3/8-inch piston GM-style “Metric”calipers use commonly available replacement pads Street friendly organic brake pad compound for long pad and rotor life Performance brake pad upgrades available separately for those wanting increased stopping power Includes everything you need to convert from drum to disc brakes with all new parts 9-1/4-inch vented rotors are preferred for smaller/lighter hot rods like T-buckets Rotors feature standard Ford 5 on 4-1/2 wheel stud bolt pattern Add Disc Brakes to Your Straight Axle Hot Rod with Bolt-On Ease We understand that the traditional straight axle hot rodder is going to want to keep the look of early Ford drum brakes on their Model T or Model A, if at all possible. However, we know there is a large base of builders that want their classic looks but with modern handling, braking, and comfort. Face it, if your hot rod is a miserable ride that will not stop you are not going to want to drive it. We get it. For those enthusiasts, a small amount of leeway in their hot rod’s traditional looks is acceptable to make it a fun long-distance cruiser that can be safely operated in today’s traffic. One of the top safety upgrades we see is updating these straight axle hot rods with front disc brake kits. Speedway Motors offers several complete disc brake conversion kit options using the popular 1949-1954 GM car spindle for small and light hot rods that do not need “big”disc brakes to stop. These kits provide everything you need to get the job done on your spindles, and if you do not have spindles for your hot rod straight axle setup, well, we have those as well! Everything You Need and Everything New Time is our most precious commodity and something that we cannot ever obtain more of. So why waste your valuable time scouring parts stores, junkyards, and Internet forums for DIY “piece it together”disc brake conversion solutions that will only cause you frustration in the garage and lead to further delays and parts searching? Speedway Motors, a leader in street rod parts, understands how important your time is, which is why we have done all the time sensitive research and parts sourcing to build the most complete Model A brake upgrade with our straight axle drum to disc brake conversion kit package for straight axles that works, is easy to install, and does not require you to mortgage a kidney just to buy it! Our disc brake kit features Mustang II-style 9-1/4-inch vented rotors that are paired with the popular 1978-1988 GM “Metric”single piston disc brake caliper. These calipers use a 2.375 (2-3/8-inch) diameter piston and offer excellent stopping power in a floating caliper design. We include standard organic brake pads, but the caliper can be upgraded with any D154 performance pad of your liking should you desire a bit more pad “bite”in your system. Also included in our kit are new brake fluid hoses, bearings, seals, dust caps, and all mounting hardware. This brake kit will add 8-1/2 inches overall to your straight axle’s center-to-center distance of your king pins. Meaning, if you are running a 48-inch axle, your overall width once installed will be 56-1/2 inches. This may be more or less than your current setup depending upon current brake package and wheel spacers. This kit requires a minimum of a 13-inch wheel; however, we recommend at least a 14-inch wheel with a 2.60-inch hub I.D. that is lug-centric for proper clearance. The caliper mounting brackets provided fit ’49-’54 Chevy car spindles are quite stout to prevent any caliper flex during hard braking. They are direct fit to these spindles but will not work with same year GM truck spindles. Machine work is required to resize the inner and outer bearing surfaces of the spindle pin, shorten the spindle pin, and rethread the retaining nut threads to properly use original spindles with this brake kit. An inner bearing and seal adapter will also be required to be welded in place to properly space the rotor. And if you do not have the means to machine and weld your original spindles for your project, or you do not have any original spindles that is not a problem either, as we offer a beautiful set of forged that include new king pins with installed bushings that are already modified for our brake kits to help you finish your project. Because the original GM steering arms will not work for a straight axle conversion you will need to update to one of our GM spindletoo, especially if you are using a drop axle, as aftermarket steering arms will save a lot of time and frustration in this regard. An Easy DIY Installation You Can Complete in Your Home Garage We have included everything you will need in our Chevy spindle straight axle disc brakes conversion kit, right down to the spindle nut with retainer and cotter pin, new bearings, brake hydraulic hoses, and more. With such a complete kit you will have your hot rod’s front brakes upgraded and back on the road in no time. The included inner bearing adapter that fits over the spindle requires welding (unless you opt for our forged modified reproduction spindles mentioned above) and you will need to replace the inner and outer bearing race in the included disc brake rotor with the new races provided. While there are several methods to install the supplied bearing race, the easiest way is with a. It is a very handy tool for removing and installing bearing races and bearing seals. Everything else in the kit will install with traditional hand tools any hot rodder will surely have in their toolbox. The included brake hoses feature a 7/16-20 thread banjo bolt with sealing washers for the caliper end and standard 3/8-24 inverted female flare for the frame end and your 3/16-inch brake hard line. These brake hoses are 18 inches in length and should work for most applications. However, if you need a different length brake hose to clear four-link style front ends or prefer an AN hose with, we have plenty ofavailable to suit your specific build style and clearance requirements. Adding disc brakes to your pre-war straight axle hot rod has never been easier thanks to Speedway Motors and the value you get for your money means more budget left over for those T-bucket parts you need! Charts (PDF) (GIF) Installation Tips Clearance between king pin axle boss and caliper bracket must be checked upon installation. If interference is found, the edge of the bracket will need to be clearanced/machined to allow for sufficient clearance though the complete turning radius. Specs Sold in Quantity Kit Bolt Pattern 5 on 4.5″ Finish Natural Minimum Recommended Wheel Diameter 14 Inch Caliper Finish Natural Rotor Diameter 9.25 Inch Rotor Shape Round Spindle Type Chevy Rotor Style Plain Face Color Natural Thread Pitch 1/2″-20 Hardware Included Yes Parking Brake Provision No Centerline of Holes 5.50 Stud Length 1.25 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 Brake Hose Material Rubber Brake Hoses Included Yes Rotor Type Vented Front Suspension Type Straight Axle Rotor Material Type Cast Iron MFG. Part # 91031955 Caliper Pistons One Front Caliper Piston Quantity 1 Front Rotor Diameter 9.25 Inch Bore Size 2.375 Bolt Hole Pattern 5×4-1/2 Notes Includes rotors, bearings and seals, calipers, pads, brake hoses, brake tabs, and caliper brackets Application Type Modified 49-54 Chevy car spindle Reviews Easy to install & it looks good in my t-bucket Rated by Hopper on May 03, 2021 Summary: They make it so easy to put it together a child could do it Yes, I recommend this product. great for t bucket, small amount of fitting required Rated by Hemi tbucket on June 30, 2015 Summary: A good kit. I upgraded a t-bucket from spindle mount wheels to five lug rotors. The kit has all the little parts so you shouldnt have to scrounge much. Note that if your spindles are not already machined, I recommend purchasing Speedways already prepared ones. Since mine were already chromed and I have some machinist skills, I did my own. There is tig welding and routine lathe work. Everything was OK until time to thread the spindle for the wheel bearing nut. It is an oddball thread size, and the die to cut 3/4-20 thread can be hard to find. Otherwise, only normal common sense assembly results in very good brakes. If you buy new spindles, get the ones with fitted king pins and bushings. Cons: A Little Fitting To Make Pros: very complete kit Yes, I recommend this product. Disc brake kit Rated by gasserhotrods on March 13, 2014 Summary: This kit fits better than the Mustang 2 kit, but neither one is correct, I returned the Mustang 2 kit and had lots of conversation with Bill (one of your techs) and sent him pictures of the problem. The problem with the Mustang 2, kit is it does not follow the arc of the rotor, at one end the pad is completely on the rotor and at the other end the pad hangs off the rotor about 3/8″ you can verify this with Bill. The GM kit has a bigger pads and the callipar is 90 degree to the rotor so you do not have the arc issue but the pads hang off the rotor about 3/8″ also. My only complant is if I am buying a product like this I expect it to be correct and fit correctly. I think you should let customers know this up front that they do not fit correctly. I have bought several disc brake conversions kits over the years and never had this type of issue. I also think you should talk to your manufactures and see if they can correct the problems. Anyway that is my gripe of the day. Thanks Phil Related Items / Suggested Parts 9.25″” GM Metric Disc Brake Kit to 1949-54 Chevy Car, 5×4.75″” BP Wilwood 290-0632 570 Brake Fluid, 12 oz Bottle Redline 80402 CV-2 Synthetic Grease 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 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 73 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.