Bring hydraulic muscle back to your rear drum brakes with the Dorman First Stop Drum Brake Wheel Cylinder (W78744), a rear-left replacement built to drop in on a long list of 1971-1989 Chevrolet and GMC trucks and vans — including the CHEVROLET B60, C30 PICKUP, C50, C60, P30 and P40, plus the GMC B6000, C5000, C6000, P35 and P4500 ([All] engines). A wheel cylinder uses hydraulic brake fluid pressure to push its internal pistons and cups outward, forcing the brake shoes against the drum. If a leaking or seized original cylinder is behind a soft pedal or fluid seeping onto the backing plate, this unit replaces it.
- Direct match: built to drop in like the original wheel cylinder on the listed vehicles, matching its fit, function and performance; manufactured and tested for quality assurance.
- Cast iron body: with a 1.5 in bore, a 7/16-24 inlet thread and 7/16 in thread diameter.
- Quality materials: EPDM rubber cups and boots for long-lasting sealing.
- Professionally tested: the bore is surface-tested to provide an optimum sealing surface for the pressure cups.
- Bleeder screw included; bleeder screw cap not included.
Cataloged in the rear-left position (including upper and lower locations). Most listed applications use one; the P30, P30 Van, P35 and P35/P3500 Van use two — see the Buyer's Guide tab for the full list. Country of origin: China.
Interchange: 18E82 · 84-44011 · 8444011 · W906336 · 101-1635 · 1011635 · W-86011 · W86011 · 33655 · 134.66011 · 135.66011 · WC250110 · 375-47064 · 37547064 · 2620632 · 5472484 · 5472820 · 78744 · 2037240 · WC37240 · F78744 · WC78744 · Manufacturer part number W78744
This part cross-references / interchanges with the following part numbers:
18E82, 84-44011, W906336, 101-1635, W-86011, 33655, 134.66011, 135.66011, WC250110, 375-47064, 2620632, 5472484, 5472820, 78744, 2037240, WC37240, F78744, WC78744
