1965–1973 Mustang Disc/Drum Proportioning Valve & Distribution Block

Part Number: BRA-653-041

This OEM-style brake combination valve combines the brake distribution block and internal proportioning valve into one assembly for front-disc/rear-drum brake systems. It is an OEM-style replacement for applicable 1970–1973 Ford and Mercury front-disc/rear-drum brake applications and may also be used when converting earlier vehicles to the later integrated combination-valve design.

Ford OEM Reference: D0OZ-2B257-C
Common Aftermarket Catalog Reference: C7ZZ-2B257-A — verify configuration before interchange.

Vehicle Compatibility

Period-Style Replacement Applications

• 1970–1973 Ford Mustang with front disc/rear drum brakes
• 1970–1973 Mercury Cougar with front disc/rear drum brakes
• 1970–1971 Ford Torino with front disc/rear drum brakes
• 1970 Ford Fairlane with front disc/rear drum brakes
• 1970–1971 Mercury Comet with front disc/rear drum brakes
• 1970–1971 Mercury Montego with front disc/rear drum brakes
• 1970–1971 Ford Ranchero with front disc/rear drum brakes
• 1970–1971 Mercury Cyclone with front disc/rear drum brakes

Disc/Drum Conversion or Adaptation Applications

This later integrated valve design may be adaptable to front-disc/rear-drum conversion systems on the following vehicles. It is not represented as a direct replacement for their original brake-valve assemblies. Verify brake-line routing, port compatibility, mounting requirements, master-cylinder compatibility, and overall brake-system suitability before installation.

• 1965–1969 Ford Mustang
• 1967–1969 Mercury Cougar
• 1960–1970 Ford Falcon with disc-brake conversions or adapted brake systems
• 1964–1969 Ford Fairlane with applicable disc-brake conversions
• 1968–1969 Ford Torino where adapting to the later combination-valve configuration
• 1970 Shelby GT350 / GT500 - verify original brake-line routing, port layout, and mounting before installation
• 1955–1957 Ford Thunderbird
• 1966–1977 Ford Bronco front-disc brake conversions

For front-disc/rear-drum brake systems only. Earlier and conversion applications may require brake-line bending, rerouting, replacement lines, and/or mounting modifications.

Features & Specifications

• Internal proportioning-valve design
• Brass valve body
• Pre-installed mounting bracket for driver-side fender-apron installation
• Designed for front-disc/rear-drum brake applications
• Provides brake distribution and rear-brake pressure control in one assembly

What's Included

• One brass proportioning valve / distribution block assembly
• One pre-installed mounting bracket
• Two zinc-plated 5/16"-18 flange spin-lock nuts with 11/16" O.D. flange

Also available with the mounting bracket supplied separately for custom installation and conversion applications.

Fitment Notes

1967–1969 factory front-disc Mustang and Cougar applications used a separate distribution block and external proportioning valve. Beginning in 1970, Ford incorporated the proportioning function into the distribution block on applicable front-disc/rear-drum brake systems. The D0OZ-2B257-C valve is identified with Ford engineering numbers D0OA-2B328-D and later D2ZA-2B328-AA.

For 1965–1969 applications, this later integrated valve design is intended for conversion or adaptation use and is not an exact reproduction of the original factory brake-valve configuration.

When installed on earlier vehicles, conversion applications, or vehicles with modified or existing brake-line configurations, minor brake-line bending, rerouting, replacement lines, and/or mounting modifications may be required to properly align the brake lines with the valve ports.

Not for drum/drum or four-wheel-disc brake systems. Professional installation and proper brake-system bleeding are recommended.

OEM & Cross-Reference Information

• CPC Part Number: BRA-653-041
• Ford OEM Reference: D0OZ-2B257-C
• Common Aftermarket Catalog Reference: C7ZZ-2B257-A — verify configuration before interchange.
• Original Ford Casting Reference: D0OA-2B328-D
• Later Ford Casting Reference: D2ZA-2B328-AA
• Original Valve Manufacturer: Kelsey-Hayes

OEM, casting, and cross-reference numbers are provided for identification and application-reference purposes only.