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DormanPart #: W37785
Dorman W37785 Drum Brake Wheel Cylinder - Rear
⚙️ 117 vehicles fit this part
Select your vehicle to confirm fitment
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🚗Fitment: Chevrolet and GMC, C2500, Sonora, Suburban 1500, Tahoe, Yukon, C1500, K1500, K1500 Suburban, Silverado, Blazer, C10, C15, C10 Pickup, and C15/C1500 Pickup
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Not what you need? Click here for all Drum Brake Wheel Cylinder options
Reliable Drum Brake Wheel Cylinder for Chevrolet and GMC Vehicles
The Dorman W37785 drum brake wheel cylinder is engineered to restore proper braking function for select Chevrolet and GMC models. Designed with durable cast iron and precise specifications, this wheel cylinder ensures consistent hydraulic pressure for safe and effective braking performance.
- Includes bleeder screw for easy brake system bleeding
- Constructed from cast iron for strength and durability
- 1.188 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
Technical Details and Specifications
The Dorman W37785 wheel cylinder features a cast iron casting material that provides reliable resistance to wear and corrosion. Its 1.188 inch bore diameter is designed to match OEM specifications, ensuring proper hydraulic pressure within the brake system. The included bleeder screw simplifies the brake bleeding process, although a bleeder screw cap is not included. Thread sizes are standardized at 3/8-24 inches for the brake component inlet and 3/8 inch for the thread diameter, facilitating compatibility with the brake lines and fittings on compatible vehicles.
Compatible Chevrolet and GMC Models
This drum brake wheel cylinder is compatible with a range of Chevrolet and GMC trucks and SUVs, including the Chevrolet Blazer, C10, C1500, C2500, Silverado, Suburban 1500, Tahoe, and the GMC K1500, K1500 Suburban, and Yukon. The part number W37785 is specifically designed to meet the hydraulic brake requirements of these models, ensuring a proper fit and reliable braking performance.
Common Brake Issues Addressed
- Leaking or damaged wheel cylinder causing brake fluid loss
- Uneven or reduced braking pressure in drum brake systems
- Brake pedal feels soft or sinks due to hydraulic failure
- Brake drag or sticking caused by faulty wheel cylinder pistons
- Corrosion or wear compromising brake system integrity
Installation Notes and Tips
When installing the Dorman W37785 drum brake wheel cylinder, ensure the brake system is fully depressurized and the vehicle is securely supported. Use the included bleeder screw to properly bleed air from the brake lines after installation. Verify thread compatibility with existing brake lines and fittings before assembly. It is recommended to inspect brake shoes and hardware during installation to maintain overall brake system performance.
Quality Assurance and Warranty
Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The W37785 wheel cylinder undergoes rigorous quality control to ensure durability and reliable operation. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship to provide confidence in your replacement part.
| Brand | Dorman |
| Part Number | W37785 |
| Bleeder Screw Cap Included | No |
| Bleeder Screw Included | Yes |
| Bore Diameter | 1.188 |
| 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 117 vehicles. Search below:
| Year | Make | Model | Body Type | Position | Notes |
|---|---|---|---|---|---|
| 2000 | Chevrolet | C2500 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 2000 | Chevrolet | Suburban 1500 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 2000 | Chevrolet | Tahoe | Rear | 1.1875 Inch Bore Compatible for 10 Inch Drum Brakes | |
| 2000 | GMC | C2500 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 2000 | GMC | Yukon | Rear | 1.1875 Inch Bore Compatible for 10 Inch Drum Brakes | |
| 1999 | Chevrolet | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1999 | Chevrolet | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1999 | Chevrolet | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1999 | Chevrolet | Silverado | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1999 | Chevrolet | Tahoe | Rear | 1.1875 Inch Bore Compatible for 10 Inch Drum Brakes | |
| 1999 | GMC | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1999 | GMC | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1999 | GMC | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1999 | GMC | Yukon | Rear | 1.1875 Inch Bore Compatible for 10 Inch Drum Brakes | |
| 1998 | Chevrolet | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1998 | Chevrolet | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1998 | Chevrolet | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1998 | Chevrolet | Silverado | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1998 | Chevrolet | Tahoe | Rear | 1.1875 Inch Bore Compatible for 10 Inch Drum Brakes | |
| 1998 | GMC | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1998 | GMC | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1998 | GMC | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1998 | GMC | Yukon | Rear | 1.1875 Inch Bore Compatible for 10 Inch Drum Brakes | |
| 1997 | Chevrolet | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1997 | Chevrolet | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1997 | Chevrolet | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1997 | Chevrolet | Silverado | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1997 | Chevrolet | Tahoe | Rear | 1.1875 Inch Bore Compatible for 10 Inch Drum Brakes | |
| 1997 | GMC | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1997 | GMC | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1997 | GMC | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1997 | GMC | Yukon | Rear | 1.1875 Inch Bore Compatible for 10 Inch Drum Brakes | |
| 1996 | Chevrolet | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1996 | Chevrolet | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1996 | Chevrolet | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1996 | Chevrolet | Silverado | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1996 | Chevrolet | Tahoe | Rear | 1.1875 Inch Bore Compatible for 10 Inch Drum Brakes | |
| 1996 | GMC | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1996 | GMC | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1996 | GMC | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1996 | GMC | Yukon | Rear | 1.1875 Inch Bore Compatible for 10 Inch Drum Brakes | |
| 1995 | Chevrolet | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1995 | Chevrolet | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1995 | Chevrolet | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1995 | Chevrolet | Silverado | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1995 | Chevrolet | Tahoe | Rear | 1.1875 Inch Bore Compatible for 10 Inch Drum Brakes | |
| 1995 | GMC | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1995 | GMC | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1995 | GMC | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1995 | GMC | Yukon | Rear | 1.1875 Inch Bore Compatible for 10 Inch Drum Brakes | |
| 1994 | Chevrolet | Blazer | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1994 | Chevrolet | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1994 | Chevrolet | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1994 | Chevrolet | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1994 | GMC | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1994 | GMC | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1994 | GMC | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1994 | GMC | Yukon | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1993 | Chevrolet | Blazer | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1993 | Chevrolet | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1993 | Chevrolet | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1993 | Chevrolet | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1993 | GMC | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1993 | GMC | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1993 | GMC | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1993 | GMC | Yukon | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1992 | Chevrolet | Blazer | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1992 | Chevrolet | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1992 | Chevrolet | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1992 | Chevrolet | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1992 | GMC | C1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1992 | GMC | K1500 | Rear | Bore: 1.1875 In.; 10 In. x 2.25 In. Brakes | |
| 1992 | GMC | K1500 Suburban | Rear | Rear Brakes: Bore size of 1.1875 In.; Fits 10 In. Drum Brake Wheel Cylinder. | |
| 1992 | GMC | Yukon | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1991 | Chevrolet | C1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Chassis |
| 1991 | Chevrolet | C1500 | Extended Cab Pickup | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. |
| 1991 | Chevrolet | K1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Suspension |
| 1991 | Chevrolet | K1500 | Extended Cab Pickup | Rear | Bore size of 1.1875 inches, compatible with vehicles equipped with standard suspension. |
| 1991 | GMC | C1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Chassis |
| 1991 | GMC | C1500 | Extended Cab Pickup | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. |
| 1991 | GMC | K1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Suspension |
| 1991 | GMC | K1500 | Extended Cab Pickup | Rear | Bore size of 1.1875 inches, compatible with vehicles equipped with standard suspension. |
| 1990 | Chevrolet | C1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Chassis |
| 1990 | Chevrolet | C1500 | Extended Cab Pickup | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. |
| 1990 | Chevrolet | K1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Suspension |
| 1990 | Chevrolet | K1500 | Extended Cab Pickup | Rear | Bore size of 1.1875 inches, compatible with vehicles equipped with standard suspension. |
| 1990 | GMC | C1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Chassis |
| 1990 | GMC | C1500 | Extended Cab Pickup | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. |
| 1990 | GMC | K1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Suspension |
| 1990 | GMC | K1500 | Extended Cab Pickup | Rear | Bore size of 1.1875 inches, compatible with vehicles equipped with standard suspension. |
| 1989 | Chevrolet | C1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Chassis |
| 1989 | Chevrolet | C1500 | Extended Cab Pickup | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. |
| 1989 | Chevrolet | K1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/RPO Code JB5 (Power Brakes, Vacuum Boosted, Front Disc, Rear Drum) or w/RPO Code JD5 (Power Brakes, Hydraulically Boosted, Front Disc, Rear Drum) |
| 1989 | Chevrolet | K1500 | Extended Cab Pickup | Rear | Bore: 1.1875 In.; w/RPO Code JB5 (Power Brakes, Vacuum Boosted, Front Disc, Rear Drum) or w/RPO Code JD5 (Power Brakes, Hydraulically Boosted, Front Disc, Rear Drum) |
| 1989 | GMC | C1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Chassis |
| 1989 | GMC | C1500 | Extended Cab Pickup | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. |
| 1989 | GMC | K1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/RPO Code JB5 (Power Brakes, Vacuum Boosted, Front Disc, Rear Drum) or w/RPO Code JD5 (Power Brakes, Hydraulically Boosted, Front Disc, Rear Drum) |
| 1989 | GMC | K1500 | Extended Cab Pickup | Rear | Bore: 1.1875 In.; w/RPO Code JB5 (Power Brakes, Vacuum Boosted, Front Disc, Rear Drum) or w/RPO Code JD5 (Power Brakes, Hydraulically Boosted, Front Disc, Rear Drum) |
| 1988 | Chevrolet | C1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Chassis |
| 1988 | Chevrolet | C1500 | Extended Cab Pickup | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. |
| 1988 | Chevrolet | K1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Suspension |
| 1988 | Chevrolet | K1500 | Extended Cab Pickup | Rear | Bore size of 1.1875 inches, compatible with vehicles equipped with standard suspension. |
| 1988 | GMC | C1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Chassis |
| 1988 | GMC | C1500 | Extended Cab Pickup | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. |
| 1988 | GMC | K1500 | Standard Cab Pickup | Rear | Bore: 1.1875 In.; w/Heavy Duty Suspension |
| 1988 | GMC | K1500 | Extended Cab Pickup | Rear | Bore size of 1.1875 inches, compatible with vehicles equipped with standard suspension. |
| 1986 | Chevrolet | C10 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1984 | Chevrolet | C10 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1983 | Chevrolet | C10 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1982 | Chevrolet | C10 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1981 | Chevrolet | C10 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1980 | Chevrolet | C10 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1979 | Chevrolet | C10 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1978 | Chevrolet | C10 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1977 | Chevrolet | C10 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1976 | Chevrolet | C10 | Rear | Drum Brake Wheel Cylinder with 1.1875-inch bore size. | |
| 1975 | Chevrolet | C10 | Rear | Drum Brake Wheel Cylinder with 1.1875-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:
116224134.66018172-151418013956203778533961784-44018F116224W-86018W906625WC13961
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.