Dorman - First Stop Brake Master Cylinder P/N:M390233
Dorman M631007 brake master cylinder for the 2016-2019 Honda Civic turns pedal force into hydraulic pressure for the brakes. It is precision-engineered to follow the design, function and performance of the original master cylinder.
A sinking or spongy brake pedal, brake fluid around the cylinder or a falling reservoir level can mean the master cylinder is failing. Before you replace it, rule out a leaking brake line or caliper and air in the hydraulic system, since each of those can also leave the pedal soft. A shop can test the system.
This is a direct-fit 2016-2019 Honda Civic master cylinder. The car takes one master cylinder, and this listing is one.
Fit and size
Build and materials
One new master cylinder. The reservoir, cap, push rod, brake booster, sensor, bleeder hoses, mounting bracket and mounting hardware are not included, so plan on new fasteners.
Interchange: 100-4014 · 130.40095 · 355-59069
46100TBAA01 · NM55653
This part cross-references / interchanges with the following part numbers:
Does the Dorman M631007 master cylinder fit the 2016-2019 Honda Civic?
Yes. Dorman M631007 is a direct-fit master cylinder for the 2016-2019 Honda Civic, and the car takes one.
Does the Dorman M631007 come with the reservoir and cap?
No. This Dorman M631007 listing is one new master cylinder. The reservoir, cap, push rod, mounting bracket and mounting hardware are not included.
What brake fluid do the rubber parts in this master cylinder resist?
All rubber components are made of EPDM compound, which resists glycol-based brake fluid.
What is the bore size of this aluminum master cylinder?
The bore diameter is 0.875 inch. The housing is aluminum, and the two outlets use M12 x 1.0 threads.
Is the Dorman M631007 made to SAE standards?
Yes. Dorman M631007 is made to meet rigorous SAE International standards, using entirely new materials.
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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.