Turn pedal effort into hydraulic braking pressure with the Dorman First Stop Brake Master Cylinder M73323, a 100% new unit with a cast iron housing and its reservoir included. It is listed as a direct-fit replacement for many models, Ford and Mercury, among them the 1967-1970 Ford Mustang, 1967-1970 Ford Country Squire and 1971-1972 Ford Custom. See the "Vehicles it fits" section for the full list.
This master cylinder is precision-engineered to match the original unit's design, function and performance on the listed applications, and it is built from new, high-quality materials for a durable replacement.
- Precise replacement: The cast iron cylinder housing is built to match the original part's casting material for similar performance.
- Durable design: All rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- 100% new: Made entirely from new materials for high quality and safety.
- Strict specifications: Made to meet rigorous SAE International standards.
Specifications: 1 in bore diameter, two outlets and a 1/2-20 rearward outlet size. The reservoir is included. Mounting hardware and a sensor are not included. Country of origin: China.
A soft or sinking brake pedal, or brake fluid seeping at the master cylinder, are signs this part may need replacing. Diagnose the brake system first, then follow the vehicle service procedure for installation and bleeding.
Interchange: 83-34017 · 100-2087 · M-81017 · 13-1485 · 10-1485 · 130.61017 · 355-54019
8334017 · 1002087 · M81017 · 131485 · 101485 · 13061017 · 35554019 · M900086 · 11485 · MC501320 · C7AZ2140C · C7AZ2140H · C7AZ2140M · C7ZZ2140C · C9AZ2140D · D2AZ2140B · 5472664 · 5472969 · 73323 · M1485 · NM1485 · MC36222 · F73323 · MC73323
This part cross-references / interchanges with the following part numbers:
83-34017, M900086, 100-2087, M-81017, 11485, 13-1485, 10-1485, 130.61017, MC501320, 355-54019, C7AZ2140C, C7AZ2140H, C7AZ2140M, C7ZZ2140C, C9AZ2140D, D2AZ2140B, 5472664, 5472969, 73323, M1485, NM1485, MC36222, F73323, MC73323
Frequently Asked Questions
Will this work as a 1967 Mustang master cylinder for the 1967-1970 Ford Mustang?
Yes. The Dorman M73323 is listed for the 1967-1970 Ford Mustang with all engines. Check the "Vehicles it fits" section to confirm it matches your vehicle.
Does it fit the 1967-1970 Ford Country Squire or 1971-1972 Ford Custom?
It is listed for the 1967-1970 Ford Country Squire and the 1971-1972 Ford Custom. The "Vehicles it fits" section shows every listed application.
What comes in the box?
The package contains one master cylinder with its reservoir included. Mounting hardware and a sensor are not included.
What are the key specifications?
It has a cast iron housing, a 1 in bore diameter, two outlets and a 1/2-20 rearward outlet size. Its rubber components use an EPDM compound for resistance to glycol-based brake fluid.
What are signs a master cylinder may need replacing?
A soft or sinking brake pedal, or brake fluid leaking at the master cylinder, may be signs it needs replacing. Other brake components can cause similar symptoms, so diagnose the system before replacing.
