Keep your rear drum brakes applying firmly with the Dorman - First Stop Drum Brake Wheel Cylinder W37663. This rear-position wheel cylinder drops in as a direct-fit replacement for the 1987-1994 Ford Ranger, 1986-1989 Ford Aerostar, and the 1994 Mazda B2300, B3000, and B4000, converting hydraulic pressure from the master cylinder into the outward piston force that pushes the drum brake shoes against the drum.
- Hydraulic actuation: Brake-fluid pressure drives its pistons outward to force the rear drum brake shoes against the drum.
- Rear drum application: Cataloged for the rear position on the listed trucks and vans.
- Signs it may need replacing: Brake-fluid seepage at the cylinder or backing plate, a soft or sinking pedal, or weak/uneven rear braking — if a leaking or seized wheel cylinder is the cause, this replaces it.
Best practice is to replace both rear wheel cylinders together and inspect the shoes and drums for even, balanced braking; diagnose the cause of any brake issue before ordering.
Interchange: 18E247 · 784-42012 · 78442012 · 784-85012 · 78485012 · 84-42012 · 8442012 · W906566 · 101-1599 · 1011599 · W-85012 · W85012 · 072-8753 · 0728753 · 33930 · 134.65012 · 135.65012 · WC13930 · 375-54071 · 37554071 · 1L5Z2V261CA · E69Z2261A · E89Z2261A · E9TZ2261A · BRWC23 · 2037663 · WC37663 · F112409 · WC112409
Manufacturer part number W37663.
This part cross-references / interchanges with the following part numbers:
18E247, 784-42012, 784-85012, 84-42012, W906566, 101-1599, W-85012, 072-8753, 33930, 134.65012, 135.65012, WC13930, 375-54071, 1L5Z2V261CA, E69Z2261A, E89Z2261A, E9TZ2261A, BRWC23, WC37663, F112409, WC112409
Frequently Asked Questions
What does this wheel cylinder do?
It converts hydraulic pressure from the master cylinder into outward piston force that pushes the rear drum brake shoes against the drum to slow the wheel.
Which vehicles does the W37663 fit?
The 1987-1994 Ford Ranger, 1986-1989 Ford Aerostar, and the 1994 Mazda B2300, B3000, and B4000. Check the "Vehicles it fits" section to confirm your vehicle.
Is this a front or rear wheel cylinder?
It is cataloged for the rear drum brake position on the listed applications.
What are the signs a wheel cylinder is failing?
Brake-fluid leaks at the cylinder or backing plate, a soft or sinking pedal, and weak or uneven rear braking. Diagnose the cause before replacing.
Should I replace both sides at once?
Replacing both rear wheel cylinders together as a matched pair is a good practice for balanced braking. This listing is for one cylinder.
