Keep hydraulic pressure flowing to your rear drum brakes with the Dorman - First Stop Drum Brake Wheel Cylinder (W37779). It's a direct-fit rear replacement for the 1988-1992 Buick Century, 1988-1990 Chevrolet Celebrity, 1990-1991 Chevrolet Lumina APV, 1988-1989 and 1991-1992 Oldsmobile Cutlass Ciera, 1990-1991 Oldsmobile Silhouette, 1988-1991 Pontiac 6000, and 1990-1991 Pontiac Trans Sport (All engines). Mounted at the rear wheel, the cylinder converts brake-line hydraulic pressure into the outward force that pushes the brake shoes against the drum. If a leaking or seized cylinder is behind your soft pedal or fluid at the backing plate, this replaces it.
- Cast iron body: with a 0.75 in inside bore.
- EPDM rubber cups and boots: for long-lasting sealing performance.
- Surface-tested bore: checked to provide an optimal sealing surface for the pressure cups.
- Bleeder screw included: M10 x 1.0 inlet thread; bleeder screw cap is not included.
Dorman engineered it as a direct replacement built to the original wheel cylinder's fit, function, and performance for the listed vehicles, and it is manufactured and tested for quality. The listed applications use two cylinders (one per rear wheel); this listing is for one, so order two and replace them as a matched pair for balanced braking. Country of origin: China.
Interchange: 18E290 · 784-36052 · 78436052 · 84-36052 · 8436052 · W906619 · 101-1498 · 1011498 · W-82052 · W82052 · 33958 · 134.62052 · 135.62052 · WC13958 · 375-45013 · 37545013 · 18014499 · 18060097 · 2037779 · WC37779 · F116367 · WC116367 · Manufacturer part number W37779
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this wheel cylinder do?
Mounted at the rear drum brake, it converts brake-line hydraulic pressure into the outward force that pushes the brake shoes against the drum when you press the pedal.
Does it include a bleeder screw?
Yes, the bleeder screw is included. The bleeder screw cap is not included. The inlet uses an M10 x 1.0 thread.
What is the bore size and material?
It has a cast iron body with a 0.75 in inside bore, and EPDM rubber cups and boots. The bore is surface-tested for an optimal sealing surface.
How many do I need for my vehicle?
The listed applications use two cylinders (one per rear wheel). This listing is for one, so order two and replace them together as a matched pair for balanced braking.
Which vehicles does W37779 fit?
It fits the 1988-1992 Buick Century, 1988-1990 Chevrolet Celebrity, 1990-1991 Chevrolet Lumina APV, 1988-1989 and 1991-1992 Oldsmobile Cutlass Ciera, Oldsmobile Silhouette, Pontiac 6000, and Pontiac Trans Sport. See the Buyer's Guide tab.
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