Rear Drum Brake Wheel Cylinder for 1989-1992 Nissan Pathfinder & More - Dorman W37870

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$18.99
MPN: W37870
Item Package Quantity: 1
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Dorman - First Stop Drum Brake Wheel Cylinder P/N:W37870
Dorman - First Stop Drum Brake Wheel Cylinder P/N:W37870
$18.99

Turn pedal pressure into shoe-to-drum braking force at the rear drum brakes with this Dorman drum brake wheel cylinder, part number W37870 from the First Stop line. It fits many vehicles, among them the 1989-1992 Nissan Pathfinder, 2000-2013 Nissan Urvan and 1990-1992 Nissan D21. See the Buyer's Guide tab for the full list and engine details.

The wheel cylinder is part of the rear drum brake assembly. It uses hydraulic pressure from the brake system to push the brake shoes outward against the drum. Dorman engineered this direct replacement to match the original wheel cylinder's fit, function and performance on the listed applications, and each unit is manufactured and tested for quality assurance.

  • Direct replacement: Engineered as a direct match for the original drum brake wheel cylinder on the listed vehicles.
  • Cost-effective service item: Dorman notes that replacing the cylinder while servicing the drum brakes is a fast, sensible way to help maintain brake performance.
  • EPDM rubber components: The pressure cups and boots are made from high-quality EPDM rubber.
  • Surface-tested bores: The cylinder bores are surface-tested to provide an optimum sealing surface for the pressure cups.

A wheel cylinder may need replacing if you see brake fluid seeping at the backing plate or inside the drum, fluid-soaked brake shoes, a soft or low brake pedal, or the vehicle pulling to one side under braking. Diagnose the cause before replacing any parts, and bleed the brake system after installation.

Interchange: 784-04313 · 84-04313 · 101-1160 · W-51313 · 072-8595 · 134.42313 · 135.42313 · 375-67032
78404313 · 8404313 · 1011160 · W51313 · 0728595 · 13442313 · 13542313 · 37567032 · 18E333 · W906666 · 34034 · WC14034 · 4410005N10 · 4410005N13 · WC37870 · F118389 · WC118389

This part cross-references / interchanges with the following part numbers:

18E333, 784-04313, 84-04313, W906666, 101-1160, W-51313, 072-8595, 34034, 134.42313, 135.42313, WC14034, 375-67032, 4410005N10, 4410005N13, WC37870, F118389, WC118389

Frequently Asked Questions

What does a drum brake wheel cylinder do?

It converts hydraulic pressure from the brake system into force that pushes the brake shoes against the drum. The W37870 is cataloged for the rear drum brakes on its listed applications.

Does the Dorman W37870 fit the 1989-1992 Nissan Pathfinder?

Yes. The 1989-1992 Nissan Pathfinder is a listed application, along with the 2000-2013 Nissan Urvan and the 1990-1992 Nissan D21. Check the Buyer's Guide tab to confirm your vehicle.

What are the cups and boots made of?

Dorman makes the pressure cups and boots on this wheel cylinder from high-quality EPDM rubber.

What are signs of a failing wheel cylinder?

Common signs include brake fluid leaking inside the drum or at the backing plate, wet brake shoes, a soft brake pedal, or pulling when braking. Other brake faults can cause similar symptoms, so diagnose first.

What does installing a wheel cylinder involve?

You typically remove the drum and shoes, disconnect the brake line, and remove the cylinder from the backing plate. Follow the vehicle service information and bleed the brakes afterward.