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Dorman - First Stop Brake Master Cylinder P/N:M390321
$103.99
Turn firm pedal pressure into reliable hydraulic braking with the Dorman - First Stop Brake Master Cylinder M390321. It drops in as a direct-fit replacement for the 1996-2002 Chevrolet Astro [All] and 1996-2002 GMC Safari [All], converting the force you apply at the pedal into the hydraulic pressure that pushes brake fluid out to the wheel brake circuits. Engineered to reproduce the original master cylinder's design, function, and performance on the listed applications.
- Aluminum housing: the cylinder housing is built to match the casting material of the original part for similar performance.
- Durable seals: 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.
- Built to spec: made to meet rigorous SAE International standards; 1.25 in bore, 2 outlets, and a 1/2-20 rearward outlet size.
The reservoir is included; a sensor is not included, and mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused. Signs this part may need replacing include a brake pedal that slowly sinks toward the floor, a spongy pedal, or brake-fluid seepage; diagnose the cause before replacing, since these symptoms can have other sources. Country of origin: China.
Interchange: 174-799 · 174799 · 18M773 · 83-44034 · 8344034 · M900997 · 100-2622 · 1002622 · M-86034 · M86034 · 13265 · 13-2779 · 132779 · 10-2779 · 102779 · 130.66034 · 131.66034 · MC250400 · 355-47162 · 35547162 · 18029952 · M2779 · NM2779 · MC390321 · F140671 · MC140671. Manufacturer part number M390321.
This part cross-references / interchanges with the following part numbers:
174-799, 18M773, 83-44034, M900997, 100-2622, M-86034, 13265, 13-2779, 10-2779, 130.66034, 131.66034, MC250400, 355-47162, 18029952, M2779, NM2779, MC390321, F140671, MC140671
Frequently Asked Questions
What does this master cylinder do?
It converts the force you apply at the brake pedal into hydraulic pressure, pushing brake fluid through its outlets to the wheel brake circuits. This unit has 2 outlets and a 1.25 in bore.
What vehicles does the M390321 fit?
It is a direct-fit replacement for the 1996-2002 Chevrolet Astro [All] and the 1996-2002 GMC Safari [All]. See the Buyer's Guide tab to confirm fitment for your vehicle.
Does it include a reservoir, sensor, or mounting hardware?
The reservoir is included. A sensor is not included, and mounting hardware is not included, so consult the vehicle service information for the correct fasteners and whether they may be reused.
Is this a new or remanufactured master cylinder?
It is 100% new, made entirely of new materials rather than remanufactured, with an aluminum housing built to match the casting material of the original part.
What are signs my master cylinder may need replacing?
Common signs include a brake pedal that slowly sinks to the floor, a spongy pedal, or brake-fluid seepage. Diagnose the cause first, since these symptoms can have other sources.
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Dorman
Dorman - First Stop Brake Master Cylinder P/N:M390321
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