Dorman - First Stop Drum Brake Wheel Cylinder W37645
Dorman - First Stop Drum Brake Wheel Cylinder W37645 - view 2
Dorman - First Stop Drum Brake Wheel Cylinder W37645 - view 3
Dorman - First Stop Drum Brake Wheel Cylinder W37645
Dorman - First Stop Drum Brake Wheel Cylinder W37645 - view 2
Dorman - First Stop Drum Brake Wheel Cylinder W37645 - view 3

Dorman - First Stop Drum Brake Wheel Cylinder P/N:W37645

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$13.99
MPN: W37645
Item Package Quantity: 1
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Dorman - First Stop Drum Brake Wheel Cylinder P/N:W37645
Dorman - First Stop Drum Brake Wheel Cylinder P/N:W37645
$13.99

Keep hydraulic pressure flowing to the rear drum brakes with the Dorman - First Stop Drum Brake Wheel Cylinder W37645. It drops in as a direct-fit replacement for the 1984-1987 Buick Century, 1984-1987 Chevrolet Celebrity, 1984-1987 Oldsmobile Cutlass Ciera, and 1984-1987 Pontiac 6000, actuating the shoes at the rear axle.

  • Hydraulic actuation: uses brake-fluid pressure from the master cylinder to push its pistons outward, forcing the brake shoes against the drum.
  • Rear placement: cataloged for the rear drum brakes on the listed applications.
  • Direct-fit replacement: intended to mount in place of the original wheel cylinder on the vehicles above.
  • Sold individually: this listing is for one cylinder; order two for a complete rear-axle replacement.

If a leaking or seized wheel cylinder is the cause of a soft pedal or fluid seeping behind the drum, this replaces it. Diagnose the cause before replacing, and bleed the brakes after installation.

Interchange: 18E240 · 784-36048 · 78436048 · 84-36048 · 8436048 · W906559 · 101-1493 · 1011493 · W-82048 · W82048 · 33884 · 134.62048 · 135.62048 · WC13884 · 375-45011 · 37545011 · 18011142 · 2037645 · WC37645 · F113468 · WC113468 · Manufacturer part number W37645

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

18E240, 784-36048, 84-36048, W906559, 101-1493, W-82048, 33884, 134.62048, 135.62048, WC13884, 375-45011, 18011142, 2037645, WC37645, F113468, WC113468

Frequently Asked Questions

What does the W37645 wheel cylinder do?

It uses hydraulic brake-fluid pressure to push its pistons outward, forcing the drum brake shoes against the drum when you apply the brakes.

Which vehicles does this fit?

It is a direct-fit replacement for the 1984-1987 Buick Century, 1984-1987 Chevrolet Celebrity, 1984-1987 Oldsmobile Cutlass Ciera, and 1984-1987 Pontiac 6000.

Is this a front or rear wheel cylinder?

It is cataloged for the rear drum brakes on the listed applications.

What are signs this part may need replacing?

Brake fluid seeping behind the drum, a soft or spongy pedal, or contaminated shoes can be signs a wheel cylinder is leaking or seized. Diagnose the cause before replacing.

Do I need to replace both sides?

It is sold individually, so this listing is for one cylinder. Replacing both sides at the same time is good practice for balanced rear braking; order two for a complete axle set.

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