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Dorman W37643 Drum Brake Wheel Cylinder - Rear
Reliable Drum Brake Wheel Cylinder for Chevrolet and GMC
The Dorman W37643 drum brake wheel cylinder is engineered to restore proper braking function for Chevrolet Astro and GMC Safari vehicles. Designed with durable cast iron construction, this wheel cylinder ensures consistent performance and longevity in your brake hydraulics system.
Key Features of the Dorman W37643 Wheel Cylinder
- Includes bleeder screw for easy brake fluid bleeding
- Brake line inlet thread diameter of 0.437 inches
- Brake component inlet thread size: 7/16-24
- Cast iron casting material for strength and durability
- Bore diameter measures 0.813 inches
- Package contains one drum brake wheel cylinder
Detailed Product Description
The Dorman W37643 drum brake wheel cylinder is specifically designed for use in the brake hydraulics system of Chevrolet Astro and GMC Safari models. Its cast iron construction provides reliable resistance to wear and corrosion, ensuring a long service life. The included bleeder screw simplifies maintenance by allowing for efficient removal of air from the brake lines, which is critical for maintaining proper brake pressure. With a bore diameter of 0.813 inches and a brake line inlet thread diameter of 0.437 inches, this wheel cylinder meets the precise specifications required for optimal brake function. The 7/16-24 brake component inlet thread size ensures compatibility with factory brake lines, making installation straightforward.
Common Applications and Issues Addressed
- Restores braking performance in Chevrolet Astro and GMC Safari drum brake systems
- Replaces leaking or seized wheel cylinders causing brake fluid loss
- Eliminates spongy brake pedal feel due to air in brake lines
- Addresses uneven brake wear caused by malfunctioning wheel cylinders
- Prevents brake failure related to compromised hydraulic pressure
Installation Notes and Tips
- Ensure the brake system is fully depressurized before removal
- Use the included bleeder screw to properly bleed air from the brake lines after installation
- Verify thread compatibility with existing brake lines (7/16-24 inlet thread size)
- Inspect brake shoes and drums for wear during installation
- Follow vehicle manufacturer torque specifications for mounting hardware
Quality Assurance and Warranty Information
Dorman manufactures the W37643 wheel cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction is tested for durability and corrosion resistance to ensure reliable brake system performance. This part is backed by Dorman's limited warranty, providing coverage against defects in material and workmanship under normal use.
| Brand | Dorman |
|---|---|
| Part Number | W37643 |
| Bleeder Screw Cap Included | No |
| Bleeder Screw Included | Yes |
| Bore Diameter | 0.813 |
| Brake Component Inlet Thread Size | 7/16-24 |
| Brake Line Inlet Thread Diameter | 0.437 |
| Casting Material | Cast Iron |
| Package Contents | 1 Drum Brake Wheel Cylinder |
This part fits 4 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1986 | Chevrolet | Astro | Rear | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. |
| 1986 | GMC | Safari | Rear | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. |
| 1985 | Chevrolet | Astro | Rear | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. |
| 1985 | GMC | Safari | Rear | Compatible with drum brake wheel cylinders with a 13/16 inch bore size. |
* 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.