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Dorman - First Stop Brake Master Cylinder P/N:M39649
$93.99
Turn pedal effort into the hydraulic pressure that works your brakes with the Dorman - First Stop Brake Master Cylinder (M39649). The master cylinder pressurizes brake fluid from the reservoir and sends it to the brake circuits when you press the pedal. This unit is a direct-fit replacement built to match the design, function, and performance of the original on the listed applications, which span select 1988-1994 Chevrolet and GMC full-size trucks and SUVs — including the C1500, C2500, C3500, C3500HD, K1500, K2500, K3500, several Suburban models, the Chevrolet Blazer and GMC Yukon (All engines) — plus the 1994 Dodge Ram 2500 (All). Check the Buyer's Guide tab for the exact year that matches your vehicle.
- 100% new: made entirely from new materials, not remanufactured.
- Cast iron housing: constructed to match the casting material of the original part.
- EPDM rubber components: a high-quality EPDM compound resists glycol-based brake fluid.
- Built to spec: made to meet rigorous SAE International standards, with two outlets and a 1.25 in bore.
Includes the reservoir. No sensor and no mounting hardware are included — consult the vehicle service information for the correct fasteners and whether they may be reused. Rearward outlet size 1/2-20. Country of origin: China.
Interchange: 174-669 · 174669 · 18M364 · 783-44022 · 78344022 · 83-44022 · 8344022 · M900570 · 100-2605 · 1002605 · M-86022 · M86022 · 12220 · 13-2353 · 132353 · 10-2353 · 102353 · 130.66022 · 131.66022 · 4746398 · MC116627 · 355-47153 · 35547153 · 18013978 · 18060087 · NM2220 · 2539649 · MC39649 · F116627 · Manufacturer part number M39649
This part cross-references / interchanges with the following part numbers:
174-669, 18M364, 783-44022, 83-44022, M900570, 100-2605, M-86022, 12220, 13-2353, 10-2353, 130.66022, 131.66022, 4746398, MC116627, 355-47153, 18013978, 18060087, NM2220, 2539649, MC39649, F116627
Frequently Asked Questions
What does this brake master cylinder do?
It converts brake-pedal force into hydraulic pressure, pushing brake fluid from the reservoir out through its outlets to the brake circuits so the brakes can apply.
Does it include a reservoir, sensor, or mounting hardware?
The reservoir is included. No sensor is included and no mounting hardware is included; consult the vehicle service information for the correct fasteners and whether they may be reused.
What are the key specs?
Cast iron housing, a 1.25 in bore, two outlets, a 1/2-20 rearward outlet size, and EPDM rubber components that resist glycol-based brake fluid. It is 100% new and made to SAE International standards.
What vehicles does M39649 fit?
It's a direct-fit replacement for select 1988-1994 Chevrolet and GMC full-size trucks and SUVs (C/K 1500-3500, Suburbans, Blazer, Yukon) and the 1994 Dodge Ram 2500. See the Buyer's Guide tab for exact years.
What are signs the master cylinder may need replacing?
A sinking or spongy pedal, loss of pressure, or fluid leaking at the cylinder can be signs. Diagnose the cause first; if a failed master cylinder is confirmed, this unit replaces it.
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Dorman - First Stop Brake Master Cylinder P/N:M39649
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