Dorman - First Stop Brake Master Cylinder P/N:M390296
Dorman M630099 brake master cylinder for the 2002-2004 Nissan Pathfinder and other vehicles turns pedal force into hydraulic pressure for the brakes.
A soft or sinking brake pedal, brake fluid around the cylinder body or a brake warning light can mean this master cylinder is worn, though a leaking caliper or a damaged brake hose can produce similar symptoms. Find the cause before you replace it.
It is a master cylinder for the 2002-2004 Nissan Pathfinder and the 2002-2003 Infiniti QX4. This listing is one brake master cylinder, and either vehicle takes one.
Fit and size
Build and materials
One brake master cylinder with its reservoir and sensor. Mounting hardware is not included, and the old hardware may not be reusable, so plan on new pieces.
Interchange: 100-1422 · 13-3136 · 11-3136 · 130.42323 · 355-67047
13881 · M55167 · NM55167 · 460105W610 · MC390774 · F141662 · F141682 · MC141662 · MC141682
This part cross-references / interchanges with the following part numbers:
Does this Dorman brake master cylinder fit the 2002-2003 Infiniti QX4?
Yes. Dorman M630099 fits the 2002-2003 Infiniti QX4 and the 2002-2004 Nissan Pathfinder, and each takes one.
Does this Dorman master cylinder come with the reservoir and sensor?
Yes. Dorman M630099 includes the reservoir and the sensor. Mounting hardware is not included.
What bore size and outlet thread does this brake master cylinder have?
The bore is 1 in, and the cylinder has two outlets. The rearward and secondary outlets are both M10 X 1.0, with a 1 mm thread pitch on the primary outlet.
Is the housing aluminum, and what are the rubber parts made of?
Dorman M630099 has an aluminum housing. All of its rubber components are an EPDM compound that resists glycol-based brake fluid.
How can I tell if this brake master cylinder is leaking?
With the engine off and cool, look for brake fluid on the cylinder body. A pedal that slowly sinks is another sign, and a shop can test the hydraulic side.
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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.