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Dorman 47423 Power Brake Booster Check Valve
Power Brake Booster Check Valve for Audi and Volkswagen
This Dorman power brake booster check valve is built to match the fit and function of the original valve on specified vehicles. It is engineered for durable, reliable performance in brake booster vacuum control, with a black plastic body and straight outlet design.
Key Features
- Direct-fit power brake booster check valve for specified Audi and Volkswagen applications
- Plastic construction with black finish
- Straight fitting outlet angle for OE-style routing
- One outlet configuration
- Valve opening size: 0.2 in
- Grommet end outside diameter: 0.334 in
- Hose end outside diameter: 0.331 in
Detailed Description
Dorman Part Number 47423 is a replacement power brake booster check valve designed for vehicles that use a 3-port brake booster vacuum setup. It is compatible with 1999-2005 Audi A4, 1999-2005 Audi A4 Quattro, and 1998-2005 Volkswagen Passat applications listed in the fitment data. This part helps maintain proper one-way vacuum flow to the brake booster, supporting consistent brake pedal feel and system operation. This part cross-references OE part number 058905291D for the same application.
What It Helps Address
- Brake pedal that feels hard or requires extra effort
- Loss of vacuum retention in the brake booster circuit
- Vacuum leakage at the booster check valve connection
- Incorrect airflow direction through the booster vacuum line
- Replacement needs for a worn or cracked OE-style valve
Installation Notes and Tips
Verify the vehicle uses a 3-port configuration before ordering. Match the hose and grommet dimensions to the existing vacuum line and booster connection for proper fitment. Inspect the surrounding vacuum hose and grommet condition during replacement to help ensure a secure seal and correct valve operation.
Quality Assurance
Dorman designs this check valve to match original fit and function on specified vehicles and to deliver dependable service in brake system applications. The part is engineered for durability and reliable performance.
| Brand | Dorman |
|---|---|
| Part Number | 47423 |
| Color/Finish | Black |
| Fitting Outlet Angle | Straight |
| Grommet End Outside Diameter | 0.334 |
| Hose End Outside Diameter | 0.331 |
| Material | Plastic |
| Outlet Quantity | 1 |
| Package Contents | 1 Check Valve |
| Valve Opening Size (in) | 0.2 in |
This part fits 22 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2005 | Audi | A4 | N/A | w/3 Ports |
| 2005 | Audi | A4 Quattro | N/A | w/3 Ports |
| 2005 | Volkswagen | Passat | N/A | w/3 Ports |
| 2004 | Audi | A4 | N/A | w/3 Ports |
| 2004 | Audi | A4 Quattro | N/A | w/3 Ports |
| 2004 | Volkswagen | Passat | N/A | w/3 Ports |
| 2003 | Audi | A4 | N/A | w/3 Ports |
| 2003 | Audi | A4 Quattro | N/A | w/3 Ports |
| 2003 | Volkswagen | Passat | N/A | w/3 Ports |
| 2002 | Audi | A4 | N/A | w/3 Ports |
| 2002 | Audi | A4 Quattro | N/A | w/3 Ports |
| 2002 | Volkswagen | Passat | N/A | w/3 Ports |
| 2001 | Audi | A4 | N/A | w/3 Ports |
| 2001 | Audi | A4 Quattro | N/A | w/3 Ports |
| 2001 | Volkswagen | Passat | N/A | w/3 Ports |
| 2000 | Audi | A4 | N/A | w/3 Ports |
| 2000 | Audi | A4 Quattro | N/A | w/3 Ports |
| 2000 | Volkswagen | Passat | N/A | w/3 Ports |
| 1999 | Audi | A4 | N/A | w/3 Ports |
| 1999 | Audi | A4 Quattro | N/A | w/3 Ports |
| 1999 | Volkswagen | Passat | N/A | w/3 Ports |
| 1998 | Volkswagen | Passat | N/A | w/3 Ports |
* 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.