Product Summary

Front Position, 5 on 4.75" Bolt Pattern, Natural

  • Our 11" drilled and slotted rotors disc brake conversion kit makes it easy to convert your old drum brake setup to disc brakes on GM full size cars
  • This full size disc brake conversion kit won't require you to swap out spindles, saving you time and money
  • Comes with 11" cast iron forged rotors (5 on 4.75" BP), loaded GM calipers, rubber brake lines, and all required hardware, seals, and bearings
  • Fits 1955-1957 & 1959-1964 full Size Chevy B-body (Impala, Bel Air, Biscayne) with 14" or larger wheels and will increase track width by 1-3/4" (7/8" per side)
  • Includes detailed instructions for a easy installation

Comes as a Kit

Key Specs

Bolt Pattern5 on 4.75"
Rotor Diameter11 Inch
Rotor TypeVented
Caliper PistonsOne

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Speedway Motors 91031911D Details

Bringing economy to performance, this brake kit offers drilled and slotted rotors for a $25 upgrade over our standard kits. These kits allow you to mount front disc brakes on your 1955-1957 & 1959-1964 Chevy full-size car (Bel-Air, Biscayne, Impala, 150 Series, 210 Series). Front disc brakes provide a significant improvement in braking performance versus the drum brakes your old Chevy came with. This disc brake kit works with stock, drum brake spindles only - it does not work with 2" drop spindles. Kit will work with 14" wheels intended for disc brake applications, as well as most 15" (or larger) wheels.

  • Greatly improves braking performance
  • Simple, bolt-on kit - no custom fabrication necessary
  • Complete kit - no need to chase down all the small bits and pieces for a full install
  • Great safety upgrade for your 55-57/59-64 Chevy full size!

Rotors are 11" diameter with 5 on 4-3/4" bolt pattern and calipers have 7/16"-20 inlets. This kit will increase track width 7/8" per side or 1-3/4" total when installed. 

  • 11" Rotors
  • 5 on 4-3/4" - bolt pattern
  • Metric calipers
  • Calipers mount behind axle (rearward)
  • Will work with 14" & larger wheels intended for use with disc brakes
  • Bearings, pads, brackets included
  • Seals and hoses
  • Hardware included
  • Increases trac-width 7/8" per side
  • For '55-'57/'59-'64 Chevy fullsize cars. 

Please note that there is a year of the o/e spindle, 1958 application, where this bracket brake kit is not applicable in that there is a fitment issue with this specific 1958 o/e spindle and it will not fit properly and as such, is not applicable to the specific o/e 1958 spindle.

Speedway Motors 91031911D Specifications

MFG. Part #91031911D
BrandSpeedway Motors
Bolt Pattern5 on 4.75"
Rotor Diameter11 Inch
Rotor TypeVented
Caliper PistonsOne
Caliper FinishNatural
Parking Brake ProvisionNo
Hardware IncludedYes
Rotor StyleDrilled & Slotted
Front Rotor IncludedYes
Front Rotor Diameter11 Inch
Front Caliper IncludedYes
Front Caliper Piston Quantity1
Front Caliper FinishNatural
Rear Caliper IncludedNo
Front Spindles IncludedNo
Master Cylinder IncludedNo
Brake Booster IncludedNo
Rear Rotor IncludedNo
Rotor Thickness1.05"
Stud Diameter0.44"
Stud Length0.80"
Track Width Increase1.75"
Sold in QuantityKit
NotesFor '55-'64 Chevy fullsize cars. Will work with 14" and larger wheels intended for use with disc brakes. Will not fit 2" drop spindles. Kit does add 1-3/4" total track width (7/8" per side). Includes rotors, calipers, caliper brackets, bearings, seals, brake pads, brake hoses, and hardware. Does not fit on 1958 OEM spindles. GO TO 91631915