Turn pedal effort into the hydraulic pressure your brakes rely on with this Dorman brake master cylinder, part number M39953 from the Dorman - First Stop line. It fits many vehicles, among them the 1991-1994 Ford Explorer, 1990-1994 Ford Ranger and 1994 Mazda B2300. See the "Vehicles it fits" section for the full list.
A master cylinder converts the force applied to the brake pedal into hydraulic pressure and sends it through the brake lines to the wheels. This Dorman master cylinder is precision-engineered to mirror the design, function and performance of the original unit on the listed applications. It is built from new, high-quality materials.
- Precise replacement: the cylinder housing is made 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: built entirely from new materials, with quality and safety in mind.
- Strict specifications: manufactured to meet rigorous SAE International standards.
Signs a master cylinder may need replacing include a soft or spongy brake pedal, a pedal that slowly sinks under steady pressure, or brake fluid leaking around the unit. If a worn master cylinder is causing the problem, this unit replaces it. After installation, bleed the brake system as directed by the vehicle service information.
Interchange: 783-42037 · 83-42037 · 100-2480 · M-85037 · 072-8885 · 13-2532 · 10-2532 · 130.65037 · 131.65037 · 355-54156
78342037 · 8342037 · 1002480 · M85037 · 0728885 · 132532 · 102532 · 13065037 · 13165037 · 35554156 · 18M1640 · 18M506 · M900713 · 12575 · MC122576 · F0TZ2140A · M2532 · NM2532 · ZZL043400 · MC39953 · F122576 · F122577 · MC122577
This part cross-references / interchanges with the following part numbers:
18M1640, 18M506, 783-42037, 83-42037, M900713, 100-2480, M-85037, 072-8885, 12575, 13-2532, 10-2532, 130.65037, 131.65037, MC122576, 355-54156, F0TZ2140A, M2532, NM2532, ZZL043400, MC39953, F122576, F122577, MC122577
Frequently Asked Questions
What does a brake master cylinder do?
It converts the force applied to the brake pedal into hydraulic pressure. That pressure travels through the brake lines to the brakes at each wheel.
Is this the right 1990-1994 Ford Ranger brake master cylinder?
M39953 is listed for the 1990-1994 Ford Ranger. The "Vehicles it fits" section shows every listed vehicle so you can check your exact model.
Can I use this as a 1991-1994 Ford Explorer master cylinder?
Yes. It is listed for the 1991-1994 Ford Explorer, and also for the 1994 Mazda B2300. See the "Vehicles it fits" section for the other listed vehicles.
What are the rubber components made of?
All rubber components are made of a high-quality EPDM compound, chosen for its resistance to glycol-based brake fluid.
What signs mean the master cylinder may need replacing?
Common signs are a soft or spongy pedal, a pedal that slowly sinks under steady pressure, or fluid leaking around the unit. Diagnose the cause before replacing parts.
