Dorman - First Stop Brake Master Cylinder P/N:M630223
Turn pedal force into hydraulic pressure for the brake lines with the Dorman brake master cylinder M39362 from the First Stop line. It is a direct-fit replacement for the 1981-1985 Mazda RX-7 (engine: All). It is built to mirror the original unit's design, function and performance, and it ships with the reservoir included.
Specifications: The bore is 0.813 in, with three outlets. The rearward and secondary outlets use M10 x 1.0 threads, and the primary outlet thread pitch is 1 mm. 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: Taiwan.
A master cylinder converts brake pedal force into hydraulic pressure in the brake lines. Signs this part may need replacing include a soft or sinking pedal, fluid seeping around the cylinder, or a steadily dropping reservoir level. These symptoms can have other causes, so diagnose the brake system first. If the original unit is at fault, this Dorman master cylinder replaces it. Bleed the system as directed by the service procedure after installation.
Interchange: 783-14102 · 83-14102 · 100-1719 · M-53102 · 072-8107 · 13-1941 · 11-1941 · 130.45102 · 355-80004
18M190 · M900390 · 11941 · MC107335 · MC1073351 · M51941 · NM51941 · FA0743400 · MC39362 · F107335 · 78314102 · 8314102 · 1001719 · M53102 · 0728107 · 131941 · 111941 · 13045102 · 35580004
This part cross-references / interchanges with the following part numbers:
Does this include a Dorman master cylinder bleeder kit?
No bleeder kit is listed. The package contains the master cylinder, which comes with its reservoir. Mounting hardware and a sensor are not included.
Which vehicle does M39362 fit?
It is listed for the 1981-1985 Mazda RX-7, engine designation All, with one used per vehicle.
What is the master cylinder made of?
The housing is cast iron, matching the casting material of the original part. The rubber components use an EPDM compound for resistance to glycol-based brake fluid.
What are the bore and outlet specifications?
It has a 0.813-inch bore and three outlets. The rearward and secondary outlets are listed with M10 x 1.0 threads, and the primary outlet has a 1 mm thread pitch.
What signs suggest a master cylinder may need replacing?
Common signs include a soft or sinking pedal, fluid seeping around the cylinder, or a dropping reservoir level. These can have other causes, so diagnose the brake system before replacing parts.
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.