14 Bolt Disc Brake Conversion Kit (SRW)

14 Bolt Disc Brake Conversion Kit (SRW)

Drop the drums—gain stopping power, save weight, and simplify your build.

This complete disc brake conversion kit is designed for full float 14 Bolt single rear wheel (SRW) axles, commonly found in GM and Chevy 3/4-ton and 1-ton trucks from 1973 to 1987. It replaces heavy drum brakes with a stronger, lighter, and more responsive disc brake setup. In many cases, it’s more affordable than rebuilding worn-out drum systems and delivers significantly better braking performance.

This kit is engineered to work with axles that have the brake drum mounted behind the hub (non-slip-over drums). To verify compatibility, measure from the 4-bolt caliper bracket flange to the hub face — it should be approximately 4-11/16".

Key Features

• Part Number: R1877
• Axle Type: Full Float 14 Bolt (SRW, 1973–1987 only)
• Wheel Requirement: 15" steel wheels (max 4" backspacing) or larger aluminum wheels
• Rotor installs behind the hub (not for slip-over drums)
• Not compatible with dually hubs or semi-float axles
• Made in the USA

What's Included in This Kit

• 2 - 14 Bolt Disc Brake Brackets with Grade 8 Bolts
• 2 - Standard Brake Calipers (10mm banjo bolts)
• 2 - Hydraulic Hoses with Banjo Fittings (3/8-24 inverted flare)
• 2 - Weld-On Brake Line Tabs
• 2 - Brake Line Clips
• 4 - New Brake Pads
• 2 - New Brake Rotors

Fitment Notes

• Studs must drop freely into the rotors — do not press-fit
• Oversized studs may require drilling rotors to fit
• Ensure at least 5/8" lug nut thread engagement with wheels installed
• Factory studs usually work; dually studs may be required for longer length
• Re-bleed brake system after installation
• Remove any residual valve to prevent rear brake drag
• Manual proportioning valve recommended for dialing in brake balance

Upgrade Options

• Parking Brake Caliper Upgrade: Swap to El Dorado-style calipers with built-in parking brake levers (uses 7/16" banjo bolts)
• Steel Braided Brake Hose Upgrade: Firmer pedal feel and better abrasion resistance—ideal for trail rigs

Recommended Add-On Products

• 14 Bolt 3/8" Differential Cover
• 14 Bolt Pinion Guard

Sold as a complete kit