1965–1973 Mustang Disc/Drum Proportioning Valve – OEM Style Distribution Block

1965–1973 Ford Mustang OEM-Style Disc/Drum Proportioning Valve & Distribution Block

Keep your classic Mustang's braking system performing as intended with this OEM-style disc/drum proportioning valve and brake distribution block. Designed for classic Ford Mustang restoration projects and brake system conversions, this integrated combination valve brings together brake fluid distribution and rear brake pressure control in one convenient assembly.

Featuring a durable brass valve body, internal proportioning valve, and pre-installed mounting bracket, this assembly is designed for front-disc/rear-drum brake applications. It helps regulate hydraulic pressure to the rear drum brakes while distributing brake fluid throughout the braking system.

Whether you're restoring a 1970–1973 Ford Mustang or adapting an earlier 1965–1969 Mustang to a later-style integrated combination valve, this OEM-style brake component provides a practical solution for your classic Ford project.

Features & Benefits

• OEM-Style Design: Based on Ford's later integrated disc/drum combination valve configuration.
• Integrated Brake Assembly: Combines the brake distribution block and internal proportioning valve into one unit.
• Durable Brass Construction: Features a solid brass valve body designed for long-lasting service.
• Rear Brake Pressure Control: Helps regulate hydraulic pressure to the rear drum brakes.
• Mounting Bracket Included: Comes with a pre-installed bracket for driver-side fender apron mounting on applicable installations.
• Classic Ford Compatibility: Designed for select classic Mustang and other Ford front-disc/rear-drum brake applications.

Vehicle Fitment

OEM-Style Replacement Applications

• 1970–1973 Ford Mustang – Front Disc / Rear Drum
• 1970–1973 Mercury Cougar – Front Disc / Rear Drum
• 1970–1971 Ford Torino – Front Disc / Rear Drum
• 1970 Ford Fairlane – Front Disc / Rear Drum
• 1970–1971 Mercury Comet – Front Disc / Rear Drum
• 1970–1971 Mercury Montego – Front Disc / Rear Drum
• 1970–1971 Ford Ranchero – Front Disc / Rear Drum
• 1970–1971 Mercury Cyclone – Front Disc / Rear Drum

Earlier Mustang & Brake Conversion Applications

This later-style integrated proportioning valve may also be adapted for front-disc/rear-drum brake conversion projects involving the following vehicles:

• 1965–1969 Ford Mustang
• 1967–1969 Mercury Cougar
• 1960–1970 Ford Falcon
• 1964–1969 Ford Fairlane
• 1968–1969 Ford Torino
• 1970 Shelby GT350 / GT500
• 1955–1957 Ford Thunderbird
• 1966–1977 Ford Bronco with front-disc brake conversions

Important Fitment Information: Earlier Mustang and conversion applications are not direct replacements for their original factory brake-valve assemblies. Brake-line routing, port compatibility, master cylinder compatibility, mounting requirements, and overall brake-system configuration must be verified before installation. Modifications may be required.

Product Specifications

• Product: Disc/Drum Proportioning Valve & Distribution Block
• Part Number: BRA-653-041
• Ford OEM Reference: D0OZ-2B257-C
• Aftermarket Reference: C7ZZ-2B257-A
• Original Ford Casting Reference: D0OA-2B328-D
• Later Ford Casting Reference: D2ZA-2B328-AA
• Original Valve Manufacturer: Kelsey-Hayes
• Construction: Brass
• Brake Configuration: Front Disc / Rear Drum
• Valve Design: Integrated Combination Valve
• Mounting: Pre-Installed Bracket

What's Included

• One brass disc/drum proportioning valve and distribution block assembly.
• One pre-installed mounting bracket.
• Two zinc-plated 5/16"-18 flange spin-lock nuts with 11/16" outside diameter flanges.

Installation Notes

This proportioning valve is designed exclusively for front-disc/rear-drum brake systems. It is not intended for four-wheel drum or four-wheel disc brake configurations.

Earlier Mustang applications and vehicles with modified brake systems may require brake-line bending, rerouting, replacement lines, or mounting modifications to properly align the brake lines with the valve ports.

Before installation, verify compatibility with your master cylinder, brake lines, and complete hydraulic brake system. Professional installation and proper brake-system bleeding are recommended to help ensure safe and reliable braking performance.

Whether you're completing a classic Mustang restoration or upgrading your Ford's braking system, Stang-Aholics has the classic Mustang parts and components to help keep your project moving in the right direction.