Dorman - First Stop Brake Master Cylinder P/N:M39580
Dorman M630328 brake master cylinder for the 1999-2000 Honda Civic and other vehicles turns pedal force into hydraulic pressure for the brakes. Two outlets send that pressure on to the brake lines.
A pedal that feels spongy or sinks, or brake fluid showing around the master cylinder, can point to a failing unit. A leaking brake line, a worn caliper or air in the system can also be behind those signs, so find the cause before buying. If a failed master cylinder is the cause, this one replaces it.
This is a brake master cylinder replacement for the 1999-2000 Honda Civic and the 2003-2007 Saturn Ion.
Fit and size
Build and materials
One master cylinder; this listing holds one, and a vehicle needs one. The reservoir, sensor and mounting hardware are not included, so plan on new hardware, since the old pieces may not be reusable.
Interchange: 100-2342 · 13-3219 · 10-3219 · 130.62128 · 130.62129 · 355-53006
22713090 · NM4208 · MC390785 · F142299 · MC142299
This part cross-references / interchanges with the following part numbers:
Is this a Honda Civic master cylinder for the 1999-2000 model years?
Yes. Dorman M630328 fits the 1999-2000 Honda Civic, and the year range alone decides fit. This listing is one master cylinder, and the car takes one.
Does this Dorman brake master cylinder fit the 2003-2007 Saturn Ion?
Yes. Dorman M630328 fits the 2003-2007 Saturn Ion, and the year range alone decides fit. The 2003-2007 Saturn Ion takes one master cylinder.
What is this Dorman master cylinder made of?
The housing is aluminum. The rubber components are made of EPDM compound for resistance to glycol-based brake fluid.
Does the Dorman M630328 come with a reservoir?
No. The box holds the master cylinder only. The reservoir, sensor and mounting hardware are not included.
What bore size and outlet threads does this master cylinder have?
The bore is 0.875 inch, with two outlets. The rear outlet is M10 x 1.0 and the secondary outlet thread is M12 x 1.0.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.