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Dorman W37644 Drum Brake Wheel Cylinder - Rear
Reliable Drum Brake Wheel Cylinder for Chevrolet and GMC Models
The Dorman W37644 drum brake wheel cylinder is engineered to restore proper braking function for select Chevrolet and GMC trucks and SUVs. Designed with durable cast iron and precise dimensions, this wheel cylinder ensures consistent hydraulic pressure for safe stopping performance.
- Includes bleeder screw for easy brake system bleeding
- Constructed from cast iron for strength and durability
- 0.875 inch bore diameter for accurate fit and function
- Brake component inlet thread size of 3/8-24 inches
- Thread diameter of 3/8 inch for secure installation
- Package contains one drum brake wheel cylinder
Durable Construction and Precise Specifications
The Dorman W37644 wheel cylinder features a cast iron casting material that provides long-lasting resistance to wear and corrosion. Its 0.875 inch bore diameter is designed to match the original equipment specifications for Chevrolet S10, S10 Blazer, GMC S15, and S15 Jimmy models. The included bleeder screw simplifies brake fluid maintenance, although the bleeder screw cap is not included. Thread sizes of 3/8-24 inches for the brake component inlet and 3/8 inch for the thread diameter ensure compatibility with the vehicle's brake hydraulic system.
Compatible Vehicles and Applications
This drum brake wheel cylinder is compatible with the following vehicles:
- Chevrolet S10
- Chevrolet S10 Blazer
- GMC S15
- GMC S15 Jimmy
It is designed to replace worn or leaking wheel cylinders in the rear drum brake assemblies of these models, restoring proper brake hydraulic pressure and pedal feel.
Common Issues Addressed by This Wheel Cylinder
- Brake fluid leaks from the wheel cylinder
- Spongy or soft brake pedal due to hydraulic failure
- Uneven brake application or reduced braking efficiency
- Corroded or damaged wheel cylinder bore
- Brake drag caused by sticking pistons
Installation Notes and Tips
- Ensure the brake system is properly bled after installation using the included bleeder screw
- Inspect brake shoes and drums for wear and replace if necessary
- Use appropriate brake fluid and follow manufacturer torque specifications for fittings
- Check for leaks and proper piston movement before completing installation
Quality Assurance and Warranty Information
Dorman manufactures the W37644 wheel cylinder to meet or exceed OEM standards for fit and function. The cast iron construction provides durability under normal operating conditions. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Refer to Dorman's official documentation for exact warranty terms.
| Brand | Dorman |
|---|---|
| Part Number | W37644 |
| Bleeder Screw Cap Included | No |
| Bleeder Screw Included | Yes |
| Bore Diameter | 0.875 |
| Brake Component Inlet Thread Size | 3/8-24 in |
| Casting Material | Cast Iron |
| Package Contents | 1 Drum Brake Wheel Cylinder |
| Thread Diameter | 3/8 |
This part fits 26 vehicles. Search below:
| Year | Make | Model | Drive Type | Position | Notes |
|---|---|---|---|---|---|
| 1988 | Chevrolet | S10 | RWD | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
| 1988 | Chevrolet | S10 Blazer | RWD | Rear | 7/8 In. Bore, fits vehicles with Manual Brakes |
| 1988 | GMC | S15 | RWD | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
| 1988 | GMC | S15 Jimmy | RWD | Rear | 7/8 In. Bore, fits vehicles with Manual Brakes |
| 1987 | Chevrolet | S10 | RWD | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
| 1987 | Chevrolet | S10 Blazer | RWD | Rear | 7/8 In. Bore, fits vehicles with Manual Brakes |
| 1987 | GMC | S15 | RWD | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
| 1987 | GMC | S15 Jimmy | RWD | Rear | 7/8 In. Bore, fits vehicles with Manual Brakes |
| 1986 | Chevrolet | S10 | RWD | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
| 1986 | Chevrolet | S10 Blazer | RWD | Rear | 7/8 In. Bore, fits vehicles with Manual Brakes |
| 1986 | GMC | S15 | RWD | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
| 1986 | GMC | S15 Jimmy | RWD | Rear | 7/8 In. Bore, fits vehicles with Manual Brakes |
| 1985 | Chevrolet | S10 | RWD | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
| 1985 | Chevrolet | S10 Blazer | RWD | Rear | 7/8 In. Bore, fits vehicles with Manual Brakes |
| 1985 | GMC | S15 | RWD | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
| 1985 | GMC | S15 Jimmy | RWD | Rear | 7/8 In. Bore, fits vehicles with Manual Brakes |
| 1984 | Chevrolet | S10 | RWD | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
| 1984 | Chevrolet | S10 Blazer | RWD | Rear | 7/8 In. Bore, fits vehicles with Manual Brakes |
| 1984 | GMC | S15 | RWD | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
| 1984 | GMC | S15 Jimmy | RWD | Rear | 7/8 In. Bore, fits vehicles with Manual Brakes |
| 1983 | Chevrolet | S10 | RWD | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
| 1983 | Chevrolet | S10 Blazer | RWD | Rear | 7/8 In. Bore, fits vehicles with Manual Brakes |
| 1983 | GMC | S15 | RWD | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
| 1983 | GMC | S15 Jimmy | RWD | Rear | 7/8 In. Bore, fits vehicles with Manual Brakes |
| 1982 | Chevrolet | S10 | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. | |
| 1982 | GMC | S15 | Rear | Fits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder. |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.