MPA Electrical B3174 Power Brake Booster

Vacuum Brake Booster for Mazda 3

Restore consistent brake assist with this remanufactured vacuum power brake booster from MPA Electrical. Built for 2004-2013 Mazda 3 and select Mazda 3 Sport applications, Part Number B3174 is engineered for low pedal effort, stable vacuum sealing, and reliable pressure transfer in everyday driving.

MPA Electrical’s Reman Vac Pwr Brake Booster w/o Master Cyl line focuses on replacement boosters that are cleaned, treated, and tested to meet standard replacement needs. This B3174 unit is a vacuum booster with a 10.76-inch diaphragm, metal housing, and a brake pedal rod extension included for the listed applications.

Key Features

• Remanufactured vacuum power brake booster
• Standard replacement brake service grade
• 10.76 in. diaphragm diameter for vacuum assist
• Metal housing construction
• Brake pedal rod extension included
• Master cylinder not included
• 8 x 1.25 mm master cylinder stud thread size
• 2 mounting studs
• Product condition: remanufactured

Detailed Description

MPA Electrical B3174 is a remanufactured vacuum brake booster designed for Mazda 3 braking systems that require a direct replacement booster without a master cylinder. The unit uses specially treated replacement components to help maintain vacuum seal integrity and consistent assist, while end-of-line testing verifies function before release. For drivers searching for a reman brake booster for Mazda 3, this part provides the core vacuum assist component needed to restore normal pedal feel and braking response.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Fix

• Hard brake pedal feel
• Reduced brake assist from a leaking booster
• Vacuum loss at the booster housing or diaphragm area
• Inconsistent pedal response during stop-and-go driving
• Brake system performance issues tied to a worn booster assembly

Installation Notes and Tips

Verify the vehicle’s brake booster configuration before installation. This unit is for vacuum booster applications and does not include the master cylinder, gasket or seal, front seal, or mounting bracket. Confirm the 8 x 1.25 mm master cylinder stud thread size and the 2-stud mounting layout match the original part before assembly.

Compatible With 2004-2013 Mazda 3, N/A; 2012 Mazda 3 Sport, N/A; 2009-2010 Mazda 3 Sport, N/A. For Mazda 3 brake booster replacement searches, B3174 is the listed remanufactured vacuum booster for these applications.

Quality Assurance

MPA Electrical subjects each booster to 100% end-of-line testing using proprietary test equipment. The remanufacturing process uses new replacement and specially treated components to support vacuum sealing, pressure transfer, and consistent braking assist.