Convert hydraulic pressure into the force that pushes your rear brake shoes outward against the drum with the Dorman - First Stop Drum Brake Wheel Cylinder W37784. This direct replacement rear wheel cylinder was engineered to match the original unit's fit, function and performance, dropping in on the 1988-1991 Chevrolet C1500 and K1500 and the 1988-1991 GMC C1500 and K1500 [All engines]. Many of these applications use two cylinders per axle, so order the quantity your vehicle needs; this listing supplies one.
- Cast iron body: a durable cast iron housing carries the bore and pistons.
- EPDM rubber cups and boots: made with high-quality EPDM rubber cups and boots for long-lasting performance.
- Surface-tested bore: the 1.125 in inside-diameter bore is surface-tested to provide an optimum sealing surface for the pressure cups.
- Serviceable: includes a bleeder screw (bleeder screw cap not included) and a 3/8-24 in inlet thread.
Signs this rear wheel cylinder may need replacing include brake fluid weeping at the wheel or backing plate, a soft or low pedal, or uneven rear braking — diagnose the cause before replacing, since these symptoms can have other sources. Country of origin: China.
Interchange: 18E1235 · 18E295 · 784-44019 · 78444019 · 84-44019 · 8444019 · W906624 · 101-1646 · 1011646 · W-86019 · W86019 · 33962 · 134.66019 · 135.66019 · WC13962 · 375-47072 · 37547072 · 18013954 · 18060084 · 116263 · 2037784 · WC37784 · F116263 · WC116263. Manufacturer part number W37784.
This part cross-references / interchanges with the following part numbers:
18E1235, 18E295, 784-44019, 84-44019, W906624, 101-1646, W-86019, 33962, 134.66019, 135.66019, WC13962, 375-47072, 18013954, 18060084, 116263, WC37784, F116263, WC116263
Frequently Asked Questions
What does a drum brake wheel cylinder do?
It converts hydraulic brake-line pressure into mechanical force, pushing the brake shoes outward against the drum to slow the vehicle.
Will this fit my vehicle?
It's a direct-fit rear wheel cylinder for the 1988-1991 Chevrolet C1500 and K1500 and the 1988-1991 GMC C1500 and K1500 [All engines]. Check the "Vehicles it fits" section to confirm your vehicle.
How many do I need?
Many of these applications use two per axle. This listing is for one cylinder, so order the quantity your vehicle requires for balanced rear braking.
Does it include a bleeder screw?
Yes, a bleeder screw is included. A bleeder screw cap is not included.
What are signs my wheel cylinder may need replacing?
Brake fluid leaking at the wheel or backing plate, a soft or low pedal, or uneven rear braking can point to a failing cylinder; diagnose the cause before replacing.
