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Dorman W4802 Drum Brake Wheel Cylinder - Rear Right
Reliable Drum Brake Wheel Cylinder for Oldsmobile and Pontiac
The Dorman W4802 drum brake wheel cylinder is engineered to restore proper brake hydraulics in select Oldsmobile and Pontiac models. Designed with durable cast iron construction and precise bore dimensions, this wheel cylinder ensures consistent braking performance for vehicles like the Oldsmobile 98 and Pontiac Bonneville.
- Includes bleeder screw for easy brake fluid bleeding
- Cast iron casting material for strength and durability
- 0.938 inch bore diameter for accurate fit and function
- Brake line inlet thread diameter of 0.437 inches
- Brake component inlet thread size of 7/16-24 UNS
- Package contains one drum brake wheel cylinder
Technical Details and Specifications
The Dorman W4802 wheel cylinder is constructed from cast iron, providing a robust and corrosion-resistant component suitable for drum brake systems. The bore diameter measures 0.938 inches, matching OEM specifications for proper hydraulic pressure and piston movement. The brake line inlet thread diameter is 0.437 inches, with a brake component inlet thread size of 7/16-24 UNS, ensuring compatibility with factory brake lines. A bleeder screw is included to facilitate brake system maintenance, although a bleeder screw cap is not provided.
Compatible Vehicles and Applications
This drum brake wheel cylinder is compatible with various Oldsmobile and Pontiac models, including:
- Oldsmobile 98
- Pontiac Bonneville
- Pontiac Catalina
- Pontiac Grand Prix
Use the Dorman W4802 to maintain or restore braking efficiency in these specific vehicles, ensuring safe and reliable stopping power.
Common Issues Addressed by This Wheel Cylinder
- Brake fluid leaks from worn or damaged wheel cylinders
- Uneven or reduced braking performance due to cylinder failure
- Brake pedal sponginess caused by internal cylinder wear
- Corrosion or pitting inside the cylinder bore affecting piston movement
- Brake drag or sticking caused by seized wheel cylinder pistons
Installation Notes and Tips
When installing the Dorman W4802 drum brake wheel cylinder, ensure the brake system is properly bled using the included bleeder screw to remove air and maintain hydraulic integrity. Verify thread compatibility with existing brake lines using the specified 7/16-24 UNS inlet thread size. Inspect brake shoes and drums for wear during installation and replace as necessary to optimize braking performance.
Quality Assurance and Warranty
Dorman manufactures the W4802 wheel cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction provides durability under typical operating conditions. While specific warranty details should be confirmed at the point of purchase, Dorman products generally include limited warranties covering defects in materials and workmanship.
| Brand | Dorman |
| Part Number | W4802 |
| Bleeder Screw Cap Included | No |
| Bleeder Screw Included | Yes |
| Bore Diameter | 0.938 |
| Brake Component Inlet Thread Size | 7/16-24 UNS |
| Brake Line Inlet Thread Diameter | 0.437 |
| Casting Material | Cast Iron |
| Package Contents | 1 Drum Brake Wheel Cylinder |
This part fits 20 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1963 | Pontiac | Bonneville | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1963 | Pontiac | Catalina | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1963 | Pontiac | Grand Prix | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1962 | Pontiac | Bonneville | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1962 | Pontiac | Catalina | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1962 | Pontiac | Grand Prix | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1961 | Pontiac | Bonneville | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1961 | Pontiac | Catalina | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1960 | Pontiac | Bonneville | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1960 | Pontiac | Catalina | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1957 | Pontiac | Bonneville | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1957 | Pontiac | Catalina | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1956 | Pontiac | Catalina | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1955 | Pontiac | Catalina | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1953 | Pontiac | Catalina | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1952 | Pontiac | Catalina | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1951 | Oldsmobile | 98 | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1951 | Pontiac | Catalina | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1950 | Oldsmobile | 98 | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1950 | Pontiac | Catalina | Rear Right | Fits 15/16" bore size drum brakes on multiple vehicle models. |
* 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.