Bring firm, even stops back to your rear drum brakes with the Dorman First Stop Drum Brake Wheel Cylinder (P/N W37585). Mounted at the rear brakes, it uses hydraulic pressure to push its internal cups and pistons outward, forcing the brake shoes against the drum. If a leaking or seized original cylinder is behind a soft pedal, uneven rear braking, or fluid at the backing plate, this replaces it. It drops in and is engineered to perform like the factory unit on the 1983-1987 Chevrolet Celebrity, Oldsmobile Cutlass Ciera and Pontiac 6000, 1984-1987 Buick Century, 1985-1986 Buick Electra, Cadillac DeVille and Fleetwood, and 1985-1986 Oldsmobile 98 (all engines) — see the Buyer's Guide tab for the full list.
- Cast iron body: a surface-tested bore provides an optimal sealing surface for the pressure cups.
- EPDM rubber cups and boots: high-quality sealing components for long-lasting performance.
- 0.75 in. inside diameter · M10 x 1.0 inlet thread (10 mm, 1.0 pitch).
- Includes a bleeder screw (bleeder screw cap not included).
Country of origin: China. These applications use two cylinders (one per rear wheel); this listing is for a single unit — replace both sides together for balanced braking.
Interchange: 172-1336 · 1721336 · 18E209 · 784-36009 · 78436009 · 84-36009 · 8436009 · 84-50009 · 8450009 · W906528 · 101-1454 · 1011454 · W-82009 · W82009 · 33862 · 134.62009 · 135.62009 · WC13862 · 375-45000 · 37545000 · 18009123 · 18010106 · 2037585 · WC37585 · F108131
This part cross-references / interchanges with the following part numbers:
172-1336, 18E209, 784-36009, 84-36009, 84-50009, W906528, 101-1454, W-82009, 33862, 134.62009, 135.62009, WC13862, 375-45000, 18009123, 18010106, WC37585, F108131, WC108131
