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GM Metric Disc Brake Kit for 910-34921 1955-57 2" Drop Spindles
GM Metric Disc Brake Kit for 910-34921 1955-57 2" Drop Spindles

GM Metric Disc Brake Kit for 910-34921 1955-57 2" Drop Spindles

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GM Metric Disc Brake Kit for 910-34921 1955-57 2" Drop Spindles
GM Metric Disc Brake Kit for 910-34921 1955-57 2" Drop Spindles
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We estimate this item will ship on or before March 23rd.
Part # 91031992
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Bolt Pattern:
5 on 4.75"
Rotor Diameter:
10.50 Inch
Rotor Type:
Caliper Pistons:
Caliper Finish:
MFG. Part #:
Rotor Thickness:
Rotor Shape:
Centerline of Holes:
Hardware Included:
Sold in Quantity:
Includes rotors, bearings and seals, calipers, pads, brake hoses, and brake tabs.
Rotor Material Type:
Cast Iron


Disc brake kit features 10-½” GM vented cast iron rotors and 1978-88 GM metric single piston calipers.

  • 10-1/2" rotors (O.E. on 1979-81 GM Midsize: Malibu, Monte Carlo, Cutlass, Regal, etc.) 
  • 5 x 4-3/4" bolt pattern
  • Rubber Brake Lines
  • 1978-88 GM Metric Calipers
  • 7/16"-20 inlet fitting
  • Includes all hardware: pads, slide bolts, seals, inner & outer wheel bearings, spindle nuts, dust caps

Spindles sold separately.

910-31992 Instructions (PDF)

Item Details

Spindles NOT included


  1. This kit will not work with the original '55-'57 Chevy drum brake master cylinder. It does not have the capacity to supply the proper amount of pressure for front disc brakes. For best results, we recommend using master cylinder booster kit 910-35556 with this front disc brake conversion.
  2. Front drum-to-disc brake conversions also require a proportioning valve to be installed in the rear brake line circuit. The proportioning valve modulates pressure to the rear brakes which is necessary to prevent the rear brakes from locking up in an emergency stop situatiuon. Recommended master cylinder booster kit 910-35556 also incudes an adjustable proportioning valve to allow for a proper installation of front disc brakes.
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.
  • 1979-1981 GM Midsize 10 1/2 Inch Disc Brake Rotors
    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
  • Speedway and Metric Chassis, Replacement Inner Seal for 910-31048
    Qty x 2
  • Inner Wheel Bearing Cone
    Qty x 2
  • Cone-Outer Wheel BRG - .844 ID
    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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