Put hydraulic pressure to work at the rear drum brakes with the Dorman First Stop drum brake wheel cylinder W79768, engineered as a direct match for the original wheel cylinder. It fits many vehicles, among them the 1988-2000 GMC C3500, the 1988-2000 GMC K3500 and the 1991-2002 Chevrolet C3500HD, as a direct-fit replacement for the listed applications. See the Buyer's Guide tab for the full list and engine details.
When you press the brake pedal, the wheel cylinder's pistons and pressure cups push the brake shoes outward against the drum. If a leaking or sticking wheel cylinder is causing a soft pedal or fluid inside the drum, this unit replaces it. It installs in either the rear left or the rear right position.
- Ideal replacement: engineered as a direct match for the original drum brake wheel cylinder on the listed applications.
- Cost-effective fix: the drum brakes are already apart during a brake service, so that is a convenient time to replace the cylinder.
- Quality materials: built with high-quality EPDM rubber cups and boots.
- Professionally tested: the cylinder bores are surface-tested for an optimum sealing surface for the pressure cups, and the part is manufactured and tested for quality assurance.
Replacing both rear wheel cylinders together is recommended for even, balanced braking.
Interchange: 172-1213 · 784-44013 · 84-44013 · 101-1637 · W-86013 · 134.66013 · 135.66013 · 375-47066
1721213 · 78444013 · 8444013 · 1011637 · W86013 · 13466013 · 13566013 · 37547066 · 18E131 · 18E1362 · W906417 · 33708 · WC13708 · 18004609 · 18060024 · 2621267 · 79768 · WC37337 · F79768 · WC79768
This part cross-references / interchanges with the following part numbers:
172-1213, 18E131, 18E1362, 784-44013, 84-44013, W906417, 101-1637, W-86013, 33708, 134.66013, 135.66013, WC13708, 375-47066, 18004609, 18060024, 2621267, 79768, WC37337, F79768, WC79768
