Turn brake-line hydraulic pressure into the outward push that forces your rear drum shoes against the drum with the Dorman First Stop Drum Brake Wheel Cylinder W37750. It drops in as a direct-fit replacement engineered to match the fit, function and performance of the original rear wheel cylinder on the listed 1985-1991 GM compacts, including the Chevrolet Cavalier, Buick Skyhawk and Pontiac Sunbird.
- EPDM rubber cups and boots: made with high-quality EPDM for long-lasting sealing.
- Cast-iron body, 16 mm bore: a cast-iron housing with a 16 mm inside-diameter bore.
- Bleeder screw included: ships with a bleeder screw (a bleeder screw cap is not included).
- Surface-tested bore: the cylinder bore is surface-tested to provide an optimum sealing surface for the pressure cups.
Replacing the wheel cylinder while you service the rear drum brakes is a quick, dependable way to keep the hydraulics working properly; the M10 x 1.0 inlet thread connects to the brake line. If a leaking or seized wheel cylinder is behind a soft pedal or fluid at the rear drums, this replaces it. Signs one may need replacing include fluid seepage behind the drum, a low or spongy pedal, and uneven rear braking. Replace both sides together as a matched pair for even, balanced braking.
Interchange: 18E284 · 784-36054 · 78436054 · 84-36054 · 8436054 · W906609 · 101-1501 · 1011501 · W-82054 · W82054 · 33960 · 134.62054 · 135.62054 · WC13960 · 375-47031 · 37547031 · 18014168 · 116384 · 2037750 · WC37750 · F116384 · WC116384. Manufacturer part number W37750.
Fitment (all engines; each application uses two — sold individually, order two for a complete rear replacement): 1985-1989 Buick Skyhawk · 1985-1988 Cadillac Cimarron · 1985-1991 Chevrolet Cavalier · 1985-1988 Oldsmobile Firenza · 1985 Pontiac J2000 Sunbird · 1986-1991 Pontiac Sunbird · 1987-1990 Buick Skylark · 1987 Buick Somerset · 1987-1991 Chevrolet Corsica · 1987 Oldsmobile Calais · 1987-1990 Pontiac Grand Am · 1988-1990 Oldsmobile Cutlass Calais · 1991 Chevrolet Beretta. See the Buyer's Guide tab for the full list.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this wheel cylinder do?
It converts hydraulic pressure from the brake line into outward force, pushing its pistons and cups to press the rear drum brake shoes against the drum.
Will this fit my vehicle?
It's a direct-fit rear wheel cylinder for 1985-1991 Chevrolet Cavalier, Buick Skyhawk, Cadillac Cimarron, Pontiac Sunbird and more — check the Buyer's Guide tab for the full list.
Is a bleeder screw included?
Yes, a bleeder screw is included. A bleeder screw cap is not included.
How many do I need?
The listed applications use two — one per rear wheel. It's sold individually, so order two to replace both sides as a matched pair.
What are the key specs?
It has a cast-iron body with a 16 mm inside-diameter bore, an M10 x 1.0 inlet thread, and EPDM rubber cups and boots.
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