MPA Electrical B3173 Power Brake Booster

Remanufactured Vacuum Brake Booster

MPA Electrical B3173 is a remanufactured vacuum power brake booster built for Volkswagen applications that need consistent brake assist and a firm pedal feel. This standard replacement booster is engineered for direct service on select Volkswagen Beetle, Jetta, Bora, and GLI models.

The MPA Electrical brake booster line is focused on restoring vacuum-assisted braking performance with remanufactured and specially treated components. Each unit is 100% end-of-line tested to verify pressure transfer and vacuum sealing before it leaves the remanufacturing process.

Key Features

• Part number: B3173
• Brand line: Reman Vac Pwr Brake Booster w/o Master Cyl
• Booster type: Vacuum
• Brake service grade: Standard Replacement
• Remanufactured metal housing
• 10.58 in. diaphragm diameter (268.73 mm)
• 2 mounting studs
• Master cylinder stud thread size: 8 x 1.25 mm
• Master cylinder not included
• Brake pedal rod extension not included

Detailed Description

MPA Electrical B3173 is a reman vacuum brake booster designed for Volkswagen brake systems that rely on vacuum assist to reduce pedal effort. It is built without a master cylinder and uses a metal housing with a 10.58-inch diaphragm diameter for service replacement on select Volkswagen Beetle, Jetta, Bora, and GLI models. The remanufactured construction and tested vacuum sealing help restore braking response when the original booster is no longer holding assist properly. This part cross-references OE number 1K1-614-106-AQ for the same application.

What It Helps Fix

• Hard brake pedal feel caused by loss of vacuum assist
• Reduced braking assist during normal pedal application
• Brake booster vacuum seal leakage
• Inconsistent pedal response on remanufactured Volkswagen brake systems
• Booster-related braking performance loss on compatible Volkswagen models

Installation Notes and Tips

• Fits 2012-2018 Volkswagen Beetle, N/A
• Fits 2005-2018 Volkswagen Jetta, N/A
• Fits 2005-2010 Volkswagen Bora, N/A
• Fits 2010 Volkswagen GLI, N/A
• Verify master cylinder transfer and mounting stud thread size before installation
• Inspect vacuum supply, check valves, and pedal linkage condition during replacement
• Master cylinder, gasket or seal, front seal, and mounting bracket are not included

Quality Assurance

MPA Electrical remanufactures this brake booster with new replacement and specially treated components, then subjects every unit to 100% end-of-line testing using proprietary equipment to confirm vacuum seal integrity and pressure transfer performance.