Eaton HO52/72 Disc Brake Conversion Bracket Pair

Eaton HO52/72 Disc Brake Conversion Bracket

Mounting brackets for disc conversion on '65–'72 Eaton axles

These brackets are based on our 14 Bolt design, which also fits the Eaton HO52/72 single rear axles used from 1965 to 1972. They’re built from 3/8" plate steel and eliminate the need for spacers, reducing both complexity and weight. These are designed to work with standard 1973–1987 Chevy 3/4-ton front calipers and rotors, with no extra mounting hardware required.

Brackets install directly and are intended for use with single steel 15" wheels with a maximum 4" backspacing. Axles older than 1971 may require stud replacement or drilling to fit the rotors properly. Use with our GM or El Dorado calipers and verify stud fitment before final assembly to ensure proper engagement and rotor seating.

Key Features

• Part Number: R1017
• Sold as a pair
• Fits Eaton HO52/72 single rear axles (1965–1972)
• Designed to work with 1973–1987 3/4-ton Chevy calipers and rotors
• No spacers required; direct mount design
• 3/8" thick steel for strength and rigidity
• Requires 15" steel wheels with max 4" backspacing

Compatible Components

• GM Dual Bleeder Loaded Brake Caliper
• Cadillac El Dorado Caliper Set with Parking Brake Lever

NAPA Part Numbers (’73–’87 Chevy 3/4 Ton Front, 4x4)

• Calipers (Late): LH – N4674, RH – N4673
• Calipers (Early): LH – N4597, RH – N4596
• Rotor: 4885677 (all years)
• Brake Line: H86572

Note

These brackets are not compatible with axles using slip-on drums. Hubs from 1970 and older may require drilling or replacement to fit 1971–1998 studs. Always check stud diameter and make sure studs drop freely into the rotor—do not press them in. Ensure at least 5/8" of lug nut thread engagement once the wheel is installed.

This setup requires steel wheels with a maximum of 4" backspacing. Use a proportioning valve to properly balance front and rear brake bias, and always re-bleed your brakes after installation. Improper stud fitment or failure to address backspacing can result in unsafe brake operation.