Dorman 47423 Power Brake Booster Check Valve

Reliable Power Brake Booster Check Valve for Audi and Volkswagen

The Dorman 47423 Power Brake Booster Check Valve is designed to maintain proper vacuum pressure in your brake system. Engineered for select Audi and Volkswagen models, this check valve ensures consistent brake booster performance and safety.

• Constructed from durable black plastic for long-lasting use
• Straight fitting outlet angle for straightforward installation
• Grommet end outside diameter of 0.334 inches for secure sealing
• Hose end outside diameter of 0.331 inches to fit OEM specifications
• Single outlet design with a valve opening size of 0.2 inches
• Includes one check valve per package

Detailed Product Description

The Dorman 47423 Power Brake Booster Check Valve is a critical component in the brake vacuum system, designed to prevent vacuum loss and maintain brake booster efficiency. Made from high-quality plastic, this valve features a straight fitting outlet angle that aligns with factory hose connections. The precise grommet and hose end diameters (0.334 and 0.331 inches respectively) ensure a tight, leak-free fit, which is essential for maintaining consistent vacuum pressure. Its black finish matches OEM parts, providing a seamless replacement for your Audi A4, A4 Quattro, or Volkswagen Passat.

Compatible Vehicles and Common Applications

This power brake booster check valve is compatible with the following vehicles:

• Audi A4
• Audi A4 Quattro
• Volkswagen Passat

It is designed to address issues such as:

• Brake pedal hardening due to vacuum leaks
• Reduced brake booster responsiveness
• Unusual hissing noises from the brake booster area
• Intermittent brake assist failure
• Vacuum system contamination or damage

Installation Notes and Tips

When installing the Dorman 47423 check valve, ensure the valve is oriented correctly with the straight fitting outlet aligned to the brake booster hose. Inspect the grommet and hose ends for any signs of wear or damage before installation. Use appropriate tools to avoid damaging the plastic material during removal or installation. Confirm vacuum integrity after installation by checking for leaks and proper brake pedal feel.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards. The 47423 Power Brake Booster Check Valve undergoes rigorous quality control to ensure reliable performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Refer to Dorman’s official documentation for exact warranty terms.