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Product Summary

Front Position, 5 on 4.75" Bolt Pattern, Natural

  • Install 11" drilled and slotted disc brakes on machined '49-'54 Chevy Car spindles our reproduction forged spindles
  • Complete kits includes rotors, calipers and brackets, pads, bearings and seals, and instructions and brake hoses
  • Large 11" drilled and slotted rotors with 2-13/16" single piston calipers bring modern braking to your hot rod
  • 11-inch disc brake rotors feature GM 5x4-3/4 bolt pattern with 7/16-20 thread studs
  • Designed for street rod dropped tube front axles using '49 to '54 Chevy spindles and flat plate steering arms

Comes as a Kit

Key Specs

MFG. Part #91031953D
BrandSpeedway Motors
PositionFront
Rotor Diameter11 Inch
Rotor TypeVented

Need To Know

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Details

  • 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, 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
  • Single 2-13/16-inch piston GM-style “Midsize” calipers use commonly available replacement pads
  • Disc brake style wheels are required for proper caliper clearance when upgrading from drum brakes
  • Street friendly organic brake pad compound for long pad and rotor life
  • Performance brake pad upgrades available separately for those wanting increased stopping power
  • Drilled and slotted 11-inch vented rotors create superior stopping power to drums, especially for heavier cars
  • Rotors feature standard GM 5 on 4-3/4 wheel stud bolt pattern
  • Includes everything you need to convert from drum to disc brakes with all new parts

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 brakes and their finned drums on their Model A or 32 roadster 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 with 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 early Chevy spindles that works, is easy to install, and does not require you to mortgage a kidney just to buy it!

Our disc brake kit features 11-inch vented rotors that are paired with the popular 1969-1977 GM “Midsize” single piston disc brake caliper. These calipers use a 2.8125 (2-13/16-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 D52 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 14-inch "disc brake" wheel, however we recommend a 15-inch wheel with a 2.80-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 GM 1949-1954 car spindles 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 spindle steering arms too, 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 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 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 through-frame fluid line adapters, we have plenty of brake hose options available 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

Specifications

KEY SPECS
MFG. Part #91031953D
BrandSpeedway Motors
PositionFront
Rotor Diameter11 Inch
Rotor TypeVented
GENERAL
Bolt Pattern5 on 4.75"
Caliper PistonsTwo
Caliper FinishNatural
ColorNatural
Parking Brake ProvisionNo
Bore Size2.8125"
Minimum Recommended Wheel Diameter15 Inch
Rotor Thickness1"
Rotor ShapeRound
Hardware IncludedYes
Sold in QuantityKit
Front Suspension TypeStreet Rod Front Axle
Front Rotor IncludedYes
Front Rotor Diameter11 Inch
Rear Rotor IncludedNo
Front Caliper IncludedYes
Front Caliper Piston Quantity2
Front Caliper FinishNatural
Rear Caliper IncludedNo
Front Spindles IncludedNo
Master Cylinder IncludedNo
Brake Booster IncludedNo
Brake Hose MaterialRubber
Brake Hoses IncludedYes