Turn pedal effort into hydraulic pressure for your brake system with the Dorman First Stop Brake Master Cylinder M73333, a new cast-iron unit supplied with its reservoir. It is listed for several models from American Motors, all engines, among them the 1972-1976 American Motors Gremlin, 1970-1976 American Motors Hornet and 1975-1976 American Motors Pacer. See the "Vehicles it fits" section for the full list.
Dorman precision-engineered this master cylinder to match the design, function and performance of the original on the listed applications. It is built from new, high-quality materials for a durable replacement.
- Matched housing: the cast-iron cylinder housing is built to match the casting material of the original part, intended to deliver similar performance.
- Fluid-resistant rubber: every rubber component is made of high-quality EPDM compound for resistance to glycol-based brake fluid.
- 100% new: made entirely of new materials.
- Strict specifications: made to meet rigorous SAE International standards.
Specifications: 1 in bore diameter; two outlets, with 1/2-20 rearward and secondary outlet threads; reservoir included; sensor and mounting hardware not included. Country of origin: Taiwan.
Signs a master cylinder may need replacing include a soft or sinking brake pedal or brake fluid leaking at the cylinder. Diagnose the brake system before replacing parts. Consult the vehicle service information for the correct fasteners, bleeding procedure and torque values.
Interchange: 83-32011 · 83-32026 · 100-2376 · M-83011 · 13-1384 · 10-1384 · 130.63011 · 355-66000
18M29 · M900159 · 11384 · 4485577 · J8126721 · MC512110 · 73333 · M1383 · M1384 · MC36386 · F73333 · MC73333 · 8332011 · 8332026 · 1002376 · M83011 · 131384 · 101384 · 13063011 · 35566000
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Is this the right Hornet master cylinder for a 1970-1976 American Motors Hornet?
Yes. It is listed for the 1970-1976 American Motors Hornet with all engines. The "Vehicles it fits" section shows every other American Motors model it fits.
What comes in the box?
One new brake master cylinder with its reservoir. Mounting hardware and a sensor are not included. Consult the vehicle service information for the correct fasteners.
What are the bore size and outlet threads?
The M73333 has a 1 in bore diameter and two outlets. The rearward and secondary outlets have 1/2-20 threads.
What is this master cylinder made of?
The housing is cast iron, built to match the casting material of the original part. All rubber components are EPDM compound for resistance to glycol-based brake fluid.
What are signs a brake master cylinder may need replacing?
A soft or sinking brake pedal or brake fluid leaking at the cylinder can be signs of a worn master cylinder. Other brake faults cause similar signs, so diagnose the system first.
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