Dorman - First Stop Brake Master Cylinder P/N:M390321

Keep hydraulic pressure flowing to the wheels with the Dorman First Stop Brake Master Cylinder, part number M390321, a direct-fit replacement for the 1996-2002 Chevrolet Astro and the 1996-2002 GMC Safari with all engines. Dorman designed this new unit to match the design, function and performance of the original master cylinder on the listed applications, and built it from new, high-quality materials for a safe, durable replacement. The master cylinder turns force from the brake pedal into hydraulic pressure and sends brake fluid through the lines to the wheels.

• Precise replacement: the cylinder housing is built to match the casting material of the original part for similar performance.
• Durable design: all rubber components use a high-quality EPDM compound that resists glycol-based brake fluid.
• 100% new: made entirely of new materials for quality and safety.
• Strict specifications: made to meet rigorous SAE International standards.

Specifications: aluminum master cylinder with a 1.25 in. bore diameter, two outlets and a 1/2-20 rearward outlet. The reservoir is included; a sensor and mounting hardware are not included, so consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: China.

Signs this part may need replacing include a brake pedal that slowly sinks to the floor, a soft or spongy pedal, or fluid leaking at the master cylinder. These symptoms can have other causes, so diagnose the brake system before replacing parts, and bleed the brakes after installation as directed by the service procedure.

Interchange: 174-799 · 83-44034 · 100-2622 · M-86034 · 13-2779 · 10-2779 · 130.66034 · 131.66034 · 355-47162
174799 · 8344034 · 1002622 · M86034 · 132779 · 102779 · 13066034 · 13166034 · 35547162 · 18M773 · M900997 · 13265 · MC250400 · 18029952 · M2779 · NM2779 · MC390321 · F140671 · MC140671