Dorman - First Stop Drum Brake Wheel Cylinder W37531
Dorman - First Stop Drum Brake Wheel Cylinder W37531 - view 2
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Dorman - First Stop Drum Brake Wheel Cylinder W37531
Dorman - First Stop Drum Brake Wheel Cylinder W37531 - view 2
Dorman - First Stop Drum Brake Wheel Cylinder W37531 - view 3

Dorman - First Stop Drum Brake Wheel Cylinder P/N:W37531

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$24.99
MPN: W37531
Item Package Quantity: 1
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Dorman - First Stop Drum Brake Wheel Cylinder P/N:W37531
Dorman - First Stop Drum Brake Wheel Cylinder P/N:W37531
$24.99

Keep your rear drum brakes clamping firmly with the Dorman - First Stop Drum Brake Wheel Cylinder (W37531), a direct-fit rear wheel cylinder for a wide range of 1980s GM compacts and mid-size cars — including the 1980-1985 Buick Skylark, 1980-1987 Chevrolet Chevette, 1982-1987 Chevrolet Celebrity and 1982-1987 Buick Century, among others (engine: All). Mounted in the rear drum brake, it channels hydraulic brake-fluid pressure to push its internal pistons and cups outward, forcing the brake shoes against the drum.

  • Cast-iron construction: the wheel cylinder bore is surface-tested to provide an optimum sealing surface for the pressure cups.
  • EPDM rubber cups and boots: high-quality rubber for long-lasting performance.
  • Bleeder screw included (bleeder screw cap not included) to make servicing straightforward.
  • Direct replacement: engineered to match the fit, function and performance of the original wheel cylinder on the listed vehicles; manufactured and tested for quality assurance.

Specs: Inside diameter 0.688 in; inlet thread size 3/8-24. Country of origin: China.

If a leaking or seized wheel cylinder is the cause of a soft pedal, fluid on the backing plate, or weak rear braking, this unit replaces it. The listed applications use two (one per side); this package contains one drum brake wheel cylinder, so replace both rear cylinders together as a matched pair for balanced braking.

Full fitment: 1980-1985 Buick Skylark [All]; 1980-1987 Chevrolet Chevette [All]; 1980-1986 Chevrolet Citation [All]; 1980-1984 Oldsmobile Omega [All]; 1980-1984 Pontiac Phoenix [All]; 1981-1987 Pontiac Acadian [All]; 1981-1987 Pontiac T1000 [All]; 1982-1987 Buick Century [All]; 1982-1986 Buick Skyhawk [All]; 1982-1986 Chevrolet Cavalier [All]; 1982-1987 Chevrolet Celebrity [All]; 1982-1987 Oldsmobile Cutlass Ciera [All]; 1982-1986 Oldsmobile Firenza [All]; 1982-1987 Pontiac 6000 [All]; 1982-1983 Pontiac J2000 [All]; 1984-1985 Pontiac J2000 Sunbird [All]; 1984-1985 Chevrolet Citation II [All]; 1986 Pontiac Sunbird [All]. See the Buyer's Guide tab to confirm your vehicle.

Interchange: 18E177 · 784-36003 · 78436003 · 84-36003 · 8436003 · 84-50003 · 8450003 · W906492 · 101-1499 · 1011499 · W-82003 · W82003 · 33826 · 134.62003 · 135.62003 · WC13826 · 375-47009 · 37547009 · 104384 · 2037531 · WC37531 · F104384 · WC104384. Manufacturer part number W37531.

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

18E177, 784-36003, 84-36003, 84-50003, W906492, 101-1499, W-82003, 33826, 134.62003, 135.62003, WC13826, 375-47009, 104384, 2037531, WC37531, F104384, WC104384

Frequently Asked Questions

What does this wheel cylinder do?

It's the hydraulic actuator in the rear drum brake — brake-fluid pressure pushes its internal pistons and cups outward to force the brake shoes against the drum.

Will it fit my vehicle?

It's a direct-fit rear wheel cylinder for many 1980s GM models such as the Chevrolet Chevette, Celebrity, Citation, Buick Century and Skylark. Check the Buyer's Guide tab for the full list.

Is the bleeder screw included?

Yes, the bleeder screw is included. The bleeder screw cap is not included.

How many do I need?

The listed applications use two (one per side). This listing is for one cylinder, so it's best to replace both rear wheel cylinders as a matched pair for balanced braking.

What are signs this part may need replacing?

Brake fluid on the backing plate or tire, a soft or sinking pedal, and weak rear braking can be signs. Diagnose the cause first, since other parts can produce these symptoms too.

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