MPA Electrical B3205 Power Brake Booster

Remanufactured Vacuum Brake Booster for Audi and Volkswagen

The MPA Electrical B3205 is a remanufactured vacuum power brake booster built for direct replacement in select Audi and Volkswagen applications. It is engineered to deliver strong braking assist with low pedal effort, helping restore consistent brake feel in vehicles such as the Audi A4, A4 Quattro, A6, A6 Quattro, S4, S6, S8, and Volkswagen Passat.

MPA Electrical reman brake boosters are built with treated replacement components to support vacuum sealing, pressure transfer, and dependable operation. Each unit is 100% end-of-line tested with proprietary equipment before release.

Key Features

• Part number B3205 remanufactured vacuum power brake booster
• Standard replacement brake service grade
• Vacuum booster type for power-assisted braking
• Metal housing construction
• 241.05 mm / 9.49 in diaphragm diameter
• 2 mounting studs with 16 x 1.0 mm master cylinder stud thread size
• Master cylinder not included
• Brake pedal rod extension not included
• Mounting bracket, gasket or seal, and front seal not included

Product Details

This MPA Electrical brake booster is a remanufactured vacuum unit designed for vehicles that rely on vacuum-assisted braking. The B3205 is built around a metal housing and a 241.05 mm diaphragm to help maintain stable assist characteristics under normal braking demand. It is a direct-fit replacement for select Audi A4, Audi A4 Quattro, Audi A6, Audi A6 Quattro, Audi S4, Audi S6, Audi S8, and Volkswagen Passat models listed in the fitment data.

This part cross-references OE-style numbers such as 3B0612107 and 8E0612107 for the same application.

What It Helps Address

• Hard brake pedal feel
• Reduced vacuum assist from a worn booster
• Inconsistent braking response during normal driving
• Brake assist loss caused by internal seal wear
• Replacement needs after booster leakage or diaphragm wear

Installation Notes and Tips

• Verify the vehicle application before installation using the listed year, make, and model coverage.
• Confirm the master cylinder is reused or replaced separately, since it is not included.
• Inspect vacuum supply lines, check valves, and related brake components during service.
• Match the 16 x 1.0 mm master cylinder stud thread size and 2-stud mounting layout to the original unit.
• Bleed and test the brake system after installation to confirm proper pedal feel and assist.

Quality Assurance

MPA Electrical remanufactured brake boosters are tested at the end of the production process using proprietary equipment to verify performance before shipment. The remanufacturing process uses new replacement and specially treated components to support vacuum sealing and pressure transfer in service.

• Fits 2002-2010 Audi A4, N/A
• Fits 2002-2009 Audi A4 Quattro, N/A
• Fits 2004-2009 Audi S4, N/A
• Fits 2007 Audi S8, N/A
• Fits 2002-2005 Audi A6 Quattro, N/A
• Fits 2002-2005 Volkswagen Passat, N/A
• Fits 2004 Audi A6, N/A
• Fits 2002 Audi A6, N/A
• Fits 2002-2004 Audi S6, N/A