Turn every press of the brake pedal into hydraulic pressure for the brake system with the Dorman First Stop Brake Master Cylinder M39324. It is a direct-fit replacement for many vehicles, among them the 1989-1991 Chevrolet V1500 Suburban, 1987-1991 GMC R2500 Suburban and 1981-1986 Chevrolet C20. See the "Vehicles it fits" section for the full list.
Dorman precision-engineered this unit so its design, function and performance replicate the original master cylinder on the listed applications. It is made from new, high-quality materials and intended as a safe, durable replacement.
- Precise replacement: the cast-iron cylinder housing is constructed 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, with quality and safety in mind.
- Strict specifications: built to meet rigorous SAE International standards.
Specifications: 1.25-inch bore diameter · 2 outlets · 1/2-20 secondary outlet thread · reservoir included · sensor not included · mounting hardware not included. Package contents: one master cylinder. Country of origin: China.
Signs the master cylinder may need replacing include a soft or sinking pedal, fluid seeping from the cylinder, or a reservoir level that keeps dropping. If the master cylinder is the cause, this unit replaces it. Consult the vehicle service information for the correct fasteners and the bleeding procedure.
Interchange: 174-599 · 783-44013 · 83-44013 · 100-2591 · M-86013 · 13-1872 · 10-1872 · 130.66013 · 131.66013 · 355-48002
174599 · 78344013 · 8344013 · 1002591 · M86013 · 131872 · 101872 · 13066013 · 13166013 · 35548002 · 18M169 · M900369 · 11872 · 11989 · MC104464 · 18008068 · 18010748 · 18014705 · 104464 · M1872 · NM1872 · MC39324 · F104464
This part cross-references / interchanges with the following part numbers:
174-599, 18M169, 783-44013, 83-44013, M900369, 100-2591, M-86013, 11872, 11989, 13-1872, 10-1872, 130.66013, 131.66013, MC104464, 355-48002, 18008068, 18010748, 18014705, 104464, M1872, NM1872, MC39324, F104464
Frequently Asked Questions
Does the Dorman M39324 come with a reservoir?
Yes, the reservoir is included. A sensor and mounting hardware are not included, so consult the vehicle service information for the correct fasteners and whether the originals may be reused.
Which vehicles does this master cylinder fit?
It is listed for many vehicles, among them the 1981-1986 Chevrolet K20 and the 1987-1991 GMC V1500 Suburban. See the "Vehicles it fits" section for the full list.
What are the key specifications of the M39324?
It has a cast-iron housing, a 1.25-inch bore diameter, two outlets and a 1/2-20 secondary outlet thread.
Is it compatible with glycol-based brake fluid?
Its rubber components use a high-quality EPDM compound that resists glycol-based brake fluid. Use the fluid type specified in your vehicle's service information.
What are signs a brake master cylinder may need replacing?
A soft or sinking pedal, fluid seeping from the cylinder, or a dropping reservoir level may be signs the master cylinder needs replacing. Other brake components can cause similar symptoms, so diagnose the system first.
