14 Bolt Disc Brake Conversion Kit (SRW)

Replace heavy drum brakes with a lighter, stronger, and more responsive disc brake setup.

This kit converts full float 14 Bolt single rear wheel (SRW) axles found in GM/Chevy 3/4- and 1-ton trucks (1973–1987) from drum to disc brakes. It includes brackets, rotors, calipers, pads, hoses, and hardware for a complete install. The setup eliminates the weight and complexity of drums, improves stopping power, and is often cheaper than a drum rebuild. It is designed for axles where the drum mounts behind the hub (non-slip-over). To confirm fitment, the measurement from the 4-bolt caliper bracket flange to the hub face should be ~4-11/16".

The kit requires 15" steel wheels with max 4" backspacing, or larger aluminum wheels. It will not work with dually hubs or semi-float axles. Studs must drop freely into the rotors (do not press fit), and at least 5/8" of lug nut engagement is required. A manual proportioning valve is recommended to balance front/rear braking, and any residual valve in the system should be removed to prevent dragging. Re-bleed the system after installation.

Key Features

• R1877
• Fits full float 14 Bolt SRW axles (1973–1987 only)
• Replaces drums with lighter, stronger disc brakes
• Rotor mounts behind hub (not for slip-over drums)
• Requires 15" steel wheels (≤4" backspacing) or larger aluminum wheels
• Not for dually hubs or semi-float axles
• Made in the USA

Kit Includes

• 2 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 rotors

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Note

Studs must drop freely into rotors (do not press fit). Oversized studs may require drilling. Ensure at least 5/8" lug nut engagement. Re-bleed brakes after installation. Remove any residual valve to avoid rear brake drag. A manual proportioning valve is recommended to adjust bias. Will not fit dually hubs or semi-float axles.