Built to turn pedal effort into hydraulic pressure for the brake system, this Dorman brake master cylinder, part number M97934 from the First Stop line, is a new replacement for a worn or leaking unit. It fits many vehicles, among them the 1977-1986 Ford F-150, 1977-1983 Ford F-250 and 1978-1986 Ford Bronco. See the "Vehicles it fits" section for the full list.
This Dorman master cylinder is precision-engineered to mirror the design, function and performance of the original master cylinder on the listed applications. It is made from new, high-quality materials for a safe, durable replacement.
- Precise replacement: the cylinder housing is built to match the casting material of the original part for similar performance.
- Durable design: every rubber component uses a high-quality EPDM compound that resists glycol-based brake fluid.
- 100% new: made entirely of new materials for quality and safety.
- Strict specifications: made to meet rigorous SAE International standards.
Signs a master cylinder may need replacing include a soft or sinking brake pedal and brake fluid leaking around the unit. Other brake faults can cause similar symptoms, so diagnose the cause before replacing.
Interchange: 783-42023 · 83-42023 · 100-2463 · M-85023 · 13-1854 · 10-1854 · 130.65023 · 131.65023 · 355-54144
78342023 · 8342023 · 1002463 · M85023 · 131854 · 101854 · 13065023 · 13165023 · 35554144 · 18M67 · M900227 · 11854 · MC97934 · D7TZ2140C · 97934 · M1854 · NM1854 · MC39011 · F97934
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
18M67, 783-42023, 83-42023, M900227, 100-2463, M-85023, 11854, 13-1854, 10-1854, 130.65023, 131.65023, MC97934, 355-54144, D7TZ2140C, 97934, M1854, NM1854, MC39011, F97934
Frequently Asked Questions
Is this the right brake master cylinder for a 1977-1986 Ford F-150?
It is listed for the 1977-1986 Ford F-150, as well as the 1977-1983 Ford F-250 and 1978-1986 Ford Bronco. Check the "Vehicles it fits" section to confirm your exact vehicle.
What does a brake master cylinder do?
It converts the force from the brake pedal into hydraulic pressure. That pressure sends brake fluid through the lines to operate the brakes at each wheel.
What are the rubber components made of?
All rubber components are made of a high-quality EPDM compound. The compound resists glycol-based brake fluid.
What signs suggest the master cylinder may need replacing?
A soft or sinking brake pedal or brake fluid leaking at the master cylinder may indicate a failing unit. Other brake faults cause similar symptoms, so diagnose the cause before replacing.
Does the master cylinder need bleeding when installed?
Yes. Master cylinders are typically bench-bled before installation, and then the brake system is bled. Follow your vehicle's service information for the procedure and the correct brake fluid.
