Help your rear drum brakes apply smoothly and evenly with the Dorman First Stop W37985 drum brake wheel cylinder, which turns hydraulic pressure from the master cylinder into the force that pushes the brake shoes out against the drum. It fits many vehicles, among them the 1994-1999 Dodge Ram 1500, 1994-1999 Dodge Ram 2500 and 1996-2002 Chevrolet Express 1500. Dorman engineered this direct-replacement unit to match the original rear wheel cylinder's fit, function and performance on the listed applications, and each one is manufactured and tested for quality assurance.
- Ideal replacement: Specifically engineered as a direct match for the original drum brake wheel cylinder on the listed applications.
- Cost-effective fix: Dorman notes that replacing the cylinder while the drum brakes are being serviced is a quick, economical step that helps maintain brake performance.
- Quality materials: Built with high-quality EPDM rubber cups and boots.
- Professionally tested: The cylinder bores are surface-tested to give the pressure cups an optimum sealing surface.
Signs a wheel cylinder may need replacing include brake fluid seeping onto the shoes or backing plate, a soft or low brake pedal, or a falling brake fluid level. Diagnose the cause before replacing any parts. If a leaking or sticking wheel cylinder is the source, this unit replaces it. Replacing the cylinders on both sides of the axle together is recommended for even, balanced braking. See the "Vehicles it fits" section for the full vehicle list and engine details.
Interchange: 172-1572 · 784-40016 · 84-40016 · 101-1679 · W-87016 · 134.67016 · 135.67016 · 375-40025
1721572 · 78440016 · 8440016 · 1011679 · W87016 · 13467016 · 13567016 · 37540025 · 18E394 · W906727 · 34102 · 4761602 · WC14102 · 18018766 · 18020674 · 18029766 · WC37985 · F131225 · WC131225
This part cross-references / interchanges with the following part numbers:
172-1572, 18E394, 784-40016, 84-40016, W906727, 101-1679, W-87016, 34102, 134.67016, 135.67016, 4761602, WC14102, 375-40025, 18018766, 18020674, 18029766, WC37985, F131225, WC131225
Frequently Asked Questions
What does a drum brake wheel cylinder do?
When you press the brake pedal, hydraulic pressure enters the wheel cylinder and its pistons push the brake shoes outward against the drum. The W37985 serves the rear drum brakes on the listed applications.
Does the W37985 fit a 1994-1999 Dodge Ram 1500?
Yes. It is listed for the 1994-1999 Dodge Ram 1500 and the 1994-1999 Dodge Ram 2500. Check the "Vehicles it fits" section for the full vehicle list.
Will it work on a 1996-2002 Chevrolet Express 1500?
Yes. The 1996-2002 Chevrolet Express 1500 is among the listed applications for this rear drum brake wheel cylinder.
What are the cups and boots made of?
Dorman makes this wheel cylinder with high-quality EPDM rubber cups and boots. The bores are surface-tested to give the pressure cups an optimum sealing surface.
What should I know about installation?
The brake system must be bled after a wheel cylinder is installed to remove air. Replacing both sides together is recommended. Follow the vehicle service information for procedures and torque values.
