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Product Summary

Front Position, 5 on 4.75" Bolt Pattern, Natural

  • 1955-57 Chevy Dropped Spindle Disc Brake Conversion Kit with master cylinder includes everything needed to upgrade your braking system
  • Dropped spindles will not only enhance the rake of your Tri-Five Chevy, they will also improve handling due to the lower roll center
  • Dropped spindles maintain factory steering & suspension geometry so original steering arms can be used
  • Premium 10-1/2" GM vented brake rotors for excellent stopping power and fade free performance
  • Includes 1978 to 1988 GM Metric calipers, brake pads, slide bolts, new bearings, seals, and brake hoses

Comes as a Kit

Key Specs

BrandSpeedway Motors
PositionFront
Rotor Diameter10.50 Inch
Rotor TypeVented

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Details

Upgrade your Tri-Five Chevy's handling and stopping power with drop spindles and brakes you can count on, all while staying on a budget.

Kit Includes:

  • (1) Pair of 1955-57 Chevy 2" Drop Spindles
  • (1) Pair of 1955-57 Metric Caliper Brackets
  • (1) Bolt Kit for 1955-57 Drop Spindle to Metric Caliper
  • (2) 1979-1981 GM Midsize 10 1/2 Inch Disc Brake Rotors
  • (1) GM Metric LH Brake Caliper, 7/16-20 Inlet
  • (1) GM Metric RH Brake Caliper, 7/16-20 Inlet
  • (1) Set of Speedway Soft Street Brake Pads, GM Metric 1978-Up D154
  • (2) Speedway Replacement Inner Seals
  • (2) Inner Wheel Bearing Cones
  • (2) Outer Wheel Bearing Cones
  • (1) Spindle Nut Kit for Speedway GM Spindles
  • (1) Front Disc Brake Hardware Kit
  • (1) GM/Corvette Cast Iron Master Cylinder, 1 Inch Bore
  • (1) GM Disc/Drum Proportioning Valve for 3/8-24 Outlets

Learn more about the products chosen and why we recommend them for your Tri-5 Chevy, here:Drop Spindle Install and Disc Brake Conversion on a 55 Chevy

1955-57 Chevy 2" Drop Spindles, Aftermarket Disc Brake Kit

  • 1955-57 Chevy 2" dropped spindles for use with aftermarket disc brake conversion kits
  • 2" drop built in
  • Cannot be used with stock drums or brake conversion for stock type spindle
  • Completes both sides
  • Maintains factory steering and suspension geometry
  • Track width is increased over stock O/E front end width by 3/4" overall or 3/8" per side

Ideal for use in conjunction with the following Wilwood brake kit for Heidts Tri-5 drop spindle application:

1955-57 Metric Caliper Brackets

  • These metric caliper brackets have a zinc finish
  • Steel design is engineered for quality as well as durability
  • .38" material thickness
  • Made in USA

Bolt Kit for 1955-57 Drop Spindle to Metric Caliper

  • Use these bolt kits to mount your drop spindle conversion to metric calipers
  • Designed for use with 1955-57 Chevy

1979-1981 GM Midsize 10 1/2 Inch Disc Brake Rotors

  • 10-1/2" rotors (O.E. on 1979-81 GM Midsize: Malibu, Monte Carlo, Cutlass, Regal, etc.)
  • 5 x 4-3/4" bolt pattern

GM Metric LH/RH Brake Calipers, 7/16-20 Inlet

  • Stock replacement single piston Metric calipers
  • Standard equipment on 1978-88 GMmid-size cars (Cutlass, Grand Prix, Regals, Monte Carlo, etc.)
  • Feature a 2.375" single piston
  • Shielded bottom inlet
  • Will save 3-1/2 lbs. per side compared to mid-size 1969-1977 calipers
  • No core charge required
  • 7/16"-20 inlet
  • 5-1/2" Mount Spacing
  • Can be usedwith brake hoses from Pre-1978 GM intermediate cars
  • UtilizesGM metric style D154brake pads

Speedway Soft Street Brake Pads, GM Metric 1978-Up D154

  • Speedway soft brake pad for GM Metric 1978-Up Calipers
  • One set outfits two calipers
  • Tech Tip: Only use full metallic pads on coated rotors

Learn how to properly Bed-In your brake pads by reading our tech article. Bedding-In Brake Pad Procedure.

Speedway Replacement Inner Seals

  • 2.00" x 2.56" x .234"

Spindle Nut Kit for Speedway GM Spindles

  • Includes a pair of castle nuts, washers and cotter pins
  • Castle Nut: 3/4"-20 (not SAE, which is 16 TPI)
  • Overall Height: 0.505"
  • Height up to the bottom of the castellated notch: 0.276"
  • Wrench size for nut: 1.00"

These dimensions are approximate. Certain brake kits may require removal of some of the nut material to allow for installation of the cotter pin.

GM/Corvette Cast Iron Master Cylinder, 1 Inch Bore

  • High-tech Corvette-stylemaster cylinders designed using OE specifications and 100% tested
  • The wide body and low profile gives this master cylinder the clearance you need when installing in tight areas and yet it maintains a large volume of fluid necessary for 2 and 4 wheel disc brake applications
  • 1" bore
  • Has 9/16" and 1/2" ports on both sides of the master cylinder
  • Works with power or manual brake systems
  • Suited disc/drum combinations
  • Has a piston adaptor that will allow for power or manual applications

Learn more about selecting the proper master cylinder for your vehicle by reading our tech article.Brake System Selection.

 

GM Disc/Drum Proportioning Valve for 3/8-24 Outlets

These proportioning valves are similar to what GM used on many cars in the 70s.

  • Non-adjustable and may require an adjustable valve in the rear brakes (if needed)
  • Block incorporates metering (for front brakes) and proportioning (for rear brakes) into one unit
  • For use withfront disc, rear drumbrake systems
  • Includes hard lines to connect to a master cylinder with 3/8"-24 outlets

Notes:

  • Bottom Front Port: 3/8"-24 IFF threads - goes to one front brake
  • Top Front Port: 3/8"-24 IFF threads - goes to one front brake
  • Middle Top Port: 1/2"-20 IFF threads - comes from master cylinder
  • Rear Top Port: 7/16"-24 IFF threads - comes from the master cylinder
  • Rear Most Port: 9/16"-18 IFF threads - goes to rear brakes

Charts

Specifications

KEY SPECS
BrandSpeedway Motors
PositionFront
Rotor Diameter10.50 Inch
Rotor TypeVented
GENERAL
Bolt Pattern5 on 4.75"
Caliper PistonsOne
Caliper FinishNatural
ColorNatural
Parking Brake ProvisionNo
Rotor Thickness1.04"
Rotor ShapeRound
Centerline of Holes5.50"
FinishNatural
Hardware IncludedYes
Sold in QuantityKit
Front Suspension TypeIFS
Rotor Material TypeCast Iron
Front Rotor IncludedYes
Front Rotor Diameter10.50 Inch
Rear Rotor IncludedNo
Front Caliper IncludedYes
Front Caliper Piston Quantity1
Front Caliper FinishNatural
Rear Caliper IncludedNo
Front Spindles IncludedYes
Master Cylinder IncludedYes
Brake Booster IncludedNo