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Dorman - First Stop Brake Master Cylinder P/N:M39641
$179.99
Convert every push of the brake pedal into the hydraulic pressure your braking system depends on with the Dorman - First Stop Brake Master Cylinder M39641. It installs as a direct-fit replacement for the 1986-1988 Volvo 740, 1986 Volvo 760, 1987 Volvo 780, and 1991 Volvo 940 (all engines), engineered to reproduce the original master cylinder's design, function, and performance on the listed applications.
- Precise replacement: the cylinder housing is built to match the casting material of the original part for comparable performance.
- Durable design: all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- 100% new: made entirely of new materials — not remanufactured — for consistent quality and safety.
- Strict specifications: made to meet rigorous SAE International standards.
This aluminum master cylinder has four outlets, with the rearward/secondary outlet using an M10 x 1.0 thread. It ships on its own — no reservoir, mounting hardware, or sensor is included, so consult the vehicle service information for the correct fasteners and whether they may be reused. If a leaking or failing master cylinder is the cause of a low or sinking brake pedal, this replaces it. Country of origin: Taiwan. Manufacturer part number M39641.
This part cross-references / interchanges with the following part numbers:
18M359, M900565, 100-1282, M-21006, 072-8191, 12099, 13-2327, 11-2070, 11-2075, 11-2327, 130.39006, MC507820, 355-27005, M52327, MC39641, 1273243, 1359693, F110998, MC110998
Frequently Asked Questions
What does the M39641 master cylinder do?
It converts brake-pedal force into hydraulic pressure and sends brake fluid to the wheel brakes. If a failed or leaking master cylinder is causing a low or spongy pedal, this replaces it.
Which vehicles does this master cylinder fit?
It's a direct-fit replacement for the 1986-1988 Volvo 740, 1986 Volvo 760, 1987 Volvo 780, and 1991 Volvo 940 (all engines). Check the Buyer's Guide tab to confirm your vehicle.
Does it include a reservoir, mounting hardware, or sensor?
No. This listing is the master cylinder only — no reservoir, mounting hardware, or sensor is included. Consult the vehicle service information for the correct fasteners and whether they may be reused.
Is this a remanufactured unit?
No. It's 100% new, made entirely of new materials rather than remanufactured, and built to meet rigorous SAE International standards.
What are signs my master cylinder may need replacing?
A brake pedal that slowly sinks under steady pressure, a spongy or low pedal, or unexplained brake-fluid loss can be signs. Diagnose the cause before replacing, since these can have other sources.
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Dorman - First Stop Brake Master Cylinder P/N:M39641
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