Turn pedal force into hydraulic pressure for your brakes with the Dorman brake master cylinder M39961 from the First Stop line. It is a direct-fit replacement for the 1990-1995 Chevrolet Astro and 1990-1995 GMC Safari. Dorman engineers this unit to match the original master cylinder's design, function and performance on the listed applications. It is built 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 from new materials, with quality and safety in mind.
- Strict specifications: Built to meet rigorous SAE International standards.
When you press the pedal, the master cylinder pushes brake fluid through the lines to the brakes at each wheel. Signs it may need replacing include a spongy or slowly sinking pedal, fluid leaking around the master cylinder, or a lit brake warning light. Other brake faults can cause the same symptoms, so diagnose the cause before replacing. For engine-specific details, see the "Vehicles it fits" section. Consult the vehicle service information for installation and bleeding procedures.
Interchange: 174-658 · 783-44026 · 83-44026 · 100-2610 · M-86026 · 13-2534 · 10-2534 · 130.66026 · 131.66026 · 355-47156
174658 · 78344026 · 8344026 · 1002610 · M86026 · 132534 · 102534 · 13066026 · 13166026 · 35547156 · 18M513 · M900720 · 12492 · MC120598 · 18015414 · 18029963 · M2534 · NM2534 · MC391563 · MC39961 · F120598
This part cross-references / interchanges with the following part numbers:
174-658, 18M513, 783-44026, 83-44026, M900720, 100-2610, M-86026, 12492, 13-2534, 10-2534, 130.66026, 131.66026, MC120598, 355-47156, 18015414, 18029963, M2534, NM2534, MC391563, MC39961, F120598
Frequently Asked Questions
Will this 1990-1995 Chevrolet Astro brake master cylinder also fit the 1990-1995 GMC Safari?
Yes. Dorman M39961 is listed as a direct-fit replacement for the 1990-1995 Chevrolet Astro and the 1990-1995 GMC Safari. Check the "Vehicles it fits" section to confirm your exact vehicle.
What does a brake master cylinder do?
It converts force from the brake pedal into hydraulic pressure and sends brake fluid through the lines to the brakes at each wheel.
What are the rubber components on this Dorman master cylinder made of?
All rubber components are made of a high-quality EPDM compound for resistance to glycol-based brake fluid.
What standards is this master cylinder built to?
It is made to meet rigorous SAE International standards. Its housing is built to match the casting material of the original part for similar performance.
What signs suggest a master cylinder may need replacing?
Signs include a spongy or sinking pedal, fluid leaking around the cylinder, or a brake warning light. Other brake faults can cause similar symptoms, so diagnose the cause before replacing.
