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Dorman W4801 Drum Brake Wheel Cylinder - Rear Left
Reliable Drum Brake Wheel Cylinder for Oldsmobile and Pontiac
The Dorman W4801 drum brake wheel cylinder is engineered to restore proper brake hydraulics in select Oldsmobile and Pontiac vehicles. Designed with durable cast iron construction and precise bore dimensions, this wheel cylinder ensures consistent braking performance for models 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: 7/16-24 UNS
- Package contains one drum brake wheel cylinder
Product Details and Specifications
The Dorman W4801 wheel cylinder is constructed from cast iron, providing a robust and long-lasting component for your brake system. Its 0.938 inch bore diameter is designed to match factory specifications, ensuring proper hydraulic pressure and brake shoe movement. The included bleeder screw simplifies maintenance by allowing trapped air to be released from the brake lines, improving brake responsiveness. The brake line inlet thread diameter measures 0.437 inches, with a 7/16-24 UNS thread size, compatible with original brake line fittings on compatible Oldsmobile and Pontiac models.
Compatible Vehicles and Applications
This drum brake wheel cylinder is compatible with several classic and late-model vehicles, including:
- Oldsmobile 98
- Pontiac Bonneville
- Pontiac Catalina
- Pontiac Grand Prix
It is designed specifically for brake hydraulics systems requiring a 0.938 inch bore diameter wheel cylinder with the specified thread sizes.
Common Brake Issues Addressed
- Leaking or damaged wheel cylinders causing brake fluid loss
- Spongy or unresponsive brake pedal due to air in brake lines
- Uneven brake shoe wear from improper wheel cylinder function
- Brake dragging or sticking caused by seized wheel cylinders
- Reduced braking efficiency in drum brake systems
Installation Notes and Tips
When installing the Dorman W4801 wheel cylinder, ensure the brake system is fully depressurized and the vehicle is securely lifted. Use the included bleeder screw to properly bleed the brake lines after installation to remove any trapped air. Verify thread compatibility with existing brake lines before installation. Inspect brake shoes and hardware for wear and replace as necessary to maintain optimal braking performance.
Quality Assurance and Warranty
Dorman manufactures this wheel cylinder to meet or exceed OEM standards, using cast iron for durability and reliable performance. The part number W4801 is backed by Dorman's quality control processes to ensure fit and function. Please refer to Dorman's official warranty policy for specific coverage details.
| Brand | Dorman |
| Part Number | W4801 |
| Bleeder Screw Included | Yes |
| Brake Line Inlet Thread Diameter | 0.437 |
| Bleeder Screw Cap Included | No |
| Casting Material | Cast iron |
| Bore Diameter | 0.938 |
| Brake Component Inlet Thread Size | 7/16-24 uns |
| Package Contents | 1 drum brake wheel cylinder |
This part fits 20 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1963 | Pontiac | Bonneville | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1963 | Pontiac | Catalina | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1963 | Pontiac | Grand Prix | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1962 | Pontiac | Bonneville | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1962 | Pontiac | Catalina | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1962 | Pontiac | Grand Prix | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1961 | Pontiac | Bonneville | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1961 | Pontiac | Catalina | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1960 | Pontiac | Bonneville | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1960 | Pontiac | Catalina | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1957 | Pontiac | Bonneville | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1957 | Pontiac | Catalina | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1956 | Pontiac | Catalina | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1955 | Pontiac | Catalina | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1953 | Pontiac | Catalina | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1952 | Pontiac | Catalina | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1951 | Oldsmobile | 98 | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1951 | Pontiac | Catalina | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1950 | Oldsmobile | 98 | Rear Left | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1950 | Pontiac | Catalina | Rear Left | 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.