Dorman - First Stop Drum Brake Wheel Cylinder W37850
Dorman - First Stop Drum Brake Wheel Cylinder W37850 - view 2
Dorman - First Stop Drum Brake Wheel Cylinder W37850 - view 3
Dorman - First Stop Drum Brake Wheel Cylinder W37850
Dorman - First Stop Drum Brake Wheel Cylinder W37850 - view 2
Dorman - First Stop Drum Brake Wheel Cylinder W37850 - view 3

Rear Drum Brake Wheel Cylinder for 1989-1996 Geo Metro & More - Dorman W37850

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$14.99
MPN: W37850
Item Package Quantity: 1
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Dorman - First Stop Drum Brake Wheel Cylinder P/N:W37850
Dorman - First Stop Drum Brake Wheel Cylinder P/N:W37850
$14.99

Turn pedal pressure into firm shoe-to-drum contact at the rear wheels with this Dorman drum brake wheel cylinder from the First Stop line, part number W37850, a direct-fit replacement for the 1989-1996 Geo Metro and 1989-1996 Suzuki Swift. Dorman designed it to duplicate the original wheel cylinder's fit, function and performance.

In a drum brake system, the wheel cylinder receives hydraulic pressure from the brake lines. Rubber-cupped pistons then push the brake shoes outward against the drum. W37850 is manufactured and tested for quality assurance.

  • Direct match: Specifically engineered as a direct match for the original drum brake wheel cylinder on the listed applications.
  • Practical service item: Replacing the wheel cylinder while the drum brakes are already apart is a quick, sensible way to help maintain brake performance.
  • EPDM rubber cups and boots: Built with high-quality EPDM rubber cups and boots.
  • Surface-tested bores: The cylinder bores are surface-tested to provide an optimum sealing surface for the pressure cups.

Signs a wheel cylinder may need replacing include brake fluid seeping at the drum or backing plate, fluid-soaked brake shoes, a soft or low pedal, or uneven braking. If a leaking or sticking wheel cylinder is the cause, W37850 replaces it. Bleed the brake system after installation, following the vehicle service information. See the Buyer's Guide tab for complete application details.

Interchange: 172-2236 · 172-2237 · 784-10101 · 84-10101 · 101-1337 · W-50101 · 072-8512 · 134.48101 · 135.48101 · 375-50011
1722236 · 1722237 · 78410101 · 8410101 · 1011337 · W50101 · 0728512 · 13448101 · 13548101 · 37550011 · 18E313 · W906646 · P9701 · 34041 · WC14041 · 91173558 · 91173559 · 91174030 · 96060654 · WC37850 · 5340186040 · 5340186041 · F118667 · WC118667

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

172-2236, 172-2237, 18E313, 784-10101, 84-10101, W906646, 101-1337, P9701, W-50101, 072-8512, 34041, 134.48101, 135.48101, WC14041, 375-50011, 91173558, 91173559, 91174030, 96060654, WC37850, 5340186040, 5340186041, F118667, WC118667

Frequently Asked Questions

Does W37850 fit the 1989-1996 Geo Metro and 1989-1996 Suzuki Swift?

Yes. W37850 is a direct-fit rear wheel cylinder for the 1989-1996 Geo Metro and 1989-1996 Suzuki Swift. Check the Buyer's Guide tab to confirm your exact vehicle.

What does a drum brake wheel cylinder do?

It turns hydraulic pressure from the brake lines into outward force. That force pushes the brake shoes against the drum so the rear brakes can slow the wheel.

What are the cups and boots made of?

Dorman makes the cups and boots from high-quality EPDM rubber. The cups seal the pistons inside the bore, and the boots help keep dirt and moisture out of the cylinder.

What are signs a rear wheel cylinder may need replacing?

Look for fluid seeping at the drum or backing plate, fluid-soaked shoes, a soft or low pedal, or uneven braking. Other brake faults can cause these signs too, so inspect the system before replacing parts.

Do I need to bleed the brakes after installing it?

Yes. Opening the hydraulic system lets air in, so the brakes must be bled after installation. Follow the vehicle service information for the correct procedure.

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