Product Summary

Front Position, 5 on 4.75" Bolt Pattern, Powder Coated

  • 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, red loaded GM calipers, braided stainless steel hoses, and all required hardware, seals, bearings
  • Also includes our GM full size 8" dual chrome power brake conversion kit for full braking power and detailed instructions for a painless install
  • Fits 1955-58 GM Full Size (Impala, Bel Air, Biscayne) using 15" or larger wheels and will increase track width by 1-3/4" (7/8" per side)

Comes as a Kit

Key Specs

MFG. Part #91664006
BrandSpeedway Motors
Rotor Diameter11 Inch
Rotor TypeVented

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Our all inclusive disc brake conversion kit makes it easy for the budget minded hot rod enthusiast to convert their drum brakes to disc brakes. The GM full size kits won't require you to swap out spindles, saving you time and money. The included power brake conversion gives you full braking power.

Full Size Chevy 1955-58 Complete Stock Height Kit Includes

  • 11" Rotors
  • Loaded Large GM Calipers
  • Caliper Brackets
  • Hoses with Banjo Bolts
  • Vacuum Hose with Intake Manifold Fittings
  • Bearings
  • Seals
  • Dust Caps
  • Spindle Nuts
  • Spindle Washers
  • All Hardware

1955-1958 GM Full Size 8" Dual Chrome Power Booster Conversion Kit (Impala, Bel Air, Biscayne)

  • 1" Bore Flat Top Aluminum Chrome Master Cylinder
  • Proportioning Valve Kit for Left Mount
  • 8" Dual Booster w/ Firewall Brackets
  • Pedal Extension & Clevis



MFG. Part #91664006
BrandSpeedway Motors
Rotor Diameter11 Inch
Rotor TypeVented
Bolt Pattern5 on 4.75"
Caliper PistonsOne
Caliper FinishPowder Coated
Parking Brake ProvisionNo
Minimum Recommended Wheel Diameter15 Inch
Rotor Thickness1"
Rotor StyleDrilled and Slotted
Front Rotor IncludedYes
Front Rotor Diameter11 Inch
Rear Rotor IncludedNo
Front Caliper IncludedYes
Front Caliper Piston Quantity1
Front Caliper MaterialCast Iron
Front Caliper FinishPowder Coated Red
Rear Caliper IncludedNo
Front Spindles IncludedNo
Master Cylinder IncludedYes
Brake Booster IncludedYes
Application TypeDisc/Drum
Brake Booster Diameter8 Inch
Brake Booster FinishChrome
Brake Booster MaterialSteel
Brake Booster TypeVacuum Diaphragm Dual
Brake Hose MaterialRubber
Brake Hoses IncludedYes
Master Cylinder Bail TypeFlat Top
Master Cylinder Bore Size1 Inch
Master Cylinder FinishChrome
Master Cylinder MaterialAluminum
Master Cylinder Port Sizes9/16-18" & 1/2-20"
Mounting Bracket IncludedYes
Brake Pedal Rod IncludedYes
Proportioning Valve LocationLeft Mount
Front Caliper PistonSingle Large Piston
Brake Booster Bracket FinishChrome