Convert brake-pedal force into the hydraulic pressure your braking system depends on with the Dorman - First Stop Brake Master Cylinder M36373. It installs as a direct-fit replacement for the 1962-1966 Cadillac DeVille, the 1962-1964 Cadillac Series 60 Fleetwood and Series 75 Fleetwood, and the 1965-1966 Cadillac Calais and Fleetwood.
The master cylinder sits at the head of the hydraulic brake system: as you press the pedal, its piston pressurizes brake fluid and distributes it through the lines to the wheel brakes. A worn or internally leaking unit is a common source of a sinking or spongy pedal and reduced braking, so a fresh replacement helps return normal, responsive hydraulic operation when a failed master cylinder is the cause.
- Hydraulic actuation: pressurizes and distributes brake fluid to apply the brakes from pedal input.
- Direct-fit application: replaces the original unit on the listed Cadillac models.
- Signs it may need replacing: a slowly sinking pedal, a soft or spongy pedal, or brake-fluid loss with no external leak — diagnose the cause before replacing.
Interchange: 83-36011 · 8336011 · 83-50011 · 8350011 · M900156 · 100-2220 · 1002220 · M-82011 · M82011 · 11264 · 13-1264 · 131264 · 10-1264 · 101264 · 130.62011 · MC509680 · 355-46002 · 35546002 · 5461183 · 5464375 · 5474120 · M1264 · MC36373 · F44398 · MC44398
Manufacturer part number M36373.
This part cross-references / interchanges with the following part numbers:
83-36011, 83-50011, M900156, 100-2220, M-82011, 11264, 13-1264, 10-1264, 130.62011, MC509680, 355-46002, 5461183, 5464375, 5474120, M1264, MC36373, F44398, MC44398
Frequently Asked Questions
What does the M36373 master cylinder do?
It converts brake-pedal force into hydraulic pressure, pressurizing brake fluid and distributing it through the lines to the wheel brakes.
Which vehicles does this master cylinder fit?
It's a direct-fit replacement for the 1962-1966 Cadillac DeVille, 1962-1964 Cadillac Series 60 and Series 75 Fleetwood, and 1965-1966 Cadillac Calais and Fleetwood. See the "Vehicles it fits" section for the full list.
How do I know if my master cylinder is failing?
Common signs include a pedal that slowly sinks under steady pressure, a soft or spongy pedal, or unexplained brake-fluid loss. Diagnose the cause before replacing, since other components can share these symptoms.
What part numbers does this unit interchange with?
It cross-references numbers including 83-36011, 83-50011, M900156, 100-2220, M-82011, 11264, 13-1264, 10-1264, 130.62011, MC509680, 355-46002, 5461183, 5464375, 5474120, M1264, MC36373, F44398 and MC44398.
Should I do anything else when replacing it?
Bench-bleed the new master cylinder before installation and bleed the brake system afterward, then top off with the fluid type specified in your vehicle's service information.
