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Front Disc Brake Kit GM Metric/Mustang II to 1949-54 Chevy, 5 on 4-3/4
Front Disc Brake Kit GM Metric/Mustang II to 1949-54 Chevy, 5 on 4-3/4

Front Disc Brake Kit GM Metric/Mustang II to 1949-54 Chevy, 5 on 4-3/4

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Front Disc Brake Kit GM Metric/Mustang II to 1949-54 Chevy, 5 on 4-3/4
Front Disc Brake Kit GM Metric/Mustang II to 1949-54 Chevy, 5 on 4-3/4
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We estimate this item will ship on or before March 23rd.
Part # 91031956
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Bolt Pattern:
5 on 4.75"
Rotor Diameter:
9.25 Inch
Rotor Type:
Caliper Pistons:
Caliper Finish:
Rotor Thickness:
Rotor Shape:
Stud Diameter:
Stud Length:
Thread Pitch:
Centerline of Holes:
Hardware Included:
Sold in Quantity:
Includes rotors, bearings and seals, calipers, pads, brake hoses, brake tabs, and caliper brackets.
Rotor Material Type:
Carbon Iron


An economical, lightweight brake kit for 1949-54 Chevy car spindles. Your stock Chevy spindles must be machined, or use Speedway 49-54 Chevy-style spindles. This kit uses 9-1/4" Mustang II vented rotors with common GM metric calipers.

  • Typically used on Model T and Model A to 1936 Ford front ends 
  • For use on street rod tube front axles when using 1949-54 Chevy style spindles  
  • Will not work with stock 1949-54 steering arms 
  • Not to be installed on stock 1949-54 Chevy vehicle front ends

910-31956 Instructions (PDF)

Item Details

5 on 4-3/4"


  1. 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.
Some parts are not legal for use in California or other states with similar laws/regulations

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What's In The Kit

Each kit from Speedway Motors is carefully packaged and delivered right to your door. Below is a list of all the items you should expect to receive when you order this kit. Some of these items may also be available for sale individually if you're here looking for replacement parts.
  • Mustang II Disc Brake Rotor, 5 on 4-3/4 Inch
    Qty x 2
  • IMCA 1978-1988 GM Metric Caliper, LH Left Hand, 7/16-20 Inlet, Racing
    Qty x 1
  • IMCA 1978-1988 GM Metric Caliper, Right Hand, 7/16-20 Inlet, Racing
    Qty x 1
  • Speedway Soft Street Brake Pads, GM Metric 1978-UP
    Qty x 1
  • Pinto Seal, 1.875 x 2.5 x .31
    Qty x 2
  • Speedway and Metric Chassis, Tapered Inner Wheel Bearing
    Qty x 2
  • Outer Wheel Bearing Cup, Tapered
    Qty x 2
  • Replacement Tapered Outer Wheel Bearing Cone, Speedway/Metric Chassis
    Qty x 2
  • BRKT Only/Metric/Mustang II/Chevy
    Qty x 2
  • Bolt Kit Mustang II/Metric/Chevy
    Qty x 1
  • BRG & Seal ADPTR Pinto - Chevy
    Qty x 2
  • Spindle Nut Kit for Speedway 49-54 Chevy and 1953-82 GM Spindles
    Qty x 1
  • Front Disc Brake Hardware Kit
    Qty x 1

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