1955-57 Chevy 2 Inch Dropped Spindle/Disc Brake Conversion Kit

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:

• 4-piston 12.19" rotor kit #140-12306

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
Foundry

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

910-34921 Instructions (PDF)

910-31992 Instructions (PDF)

Brake Pad Brand Guide (Link) 

Brake System Builders Tip (Link)

GM Proportioning Valve Plumbing Instructions (PDF)