MPA Electrical B3143 Power Brake Booster

Overview

This remanufactured vacuum power brake booster is built for Subaru braking systems that need restored assist and consistent pedal feel. MPA Electrical part B3143 is a standard replacement unit for applications that use a booster without a master cylinder.

Fits 1990-2001 Subaru Legacy, N/A. Fits 1998-2001 Subaru Forester, N/A. Fits 2000 Subaru Outback, N/A.

Key Features

• Vacuum booster design for braking assist with reduced pedal effort.
• Remanufactured standard replacement construction.
• Metal housing with a 247.4 mm diaphragm diameter.
• 8 x 1.25 mm master cylinder stud thread size.
• No master cylinder, gasket, seal, mounting bracket, or front seal included.

Detailed Description

MPA Electrical B3143 is a remanufactured power brake booster engineered to restore vacuum-assisted braking performance in Subaru Legacy, Subaru Forester, and Subaru Outback applications listed in the fitment data. The unit uses a metal housing and a 247.4 mm diaphragm diameter to support reliable pressure transfer, while the two-stud mounting layout and 8 x 1.25 mm master cylinder stud thread size match the specified applications. This part number, B3143, cross-references Subaru OE numbers such as 26402AA230 and 26402FC140 for the same application.

MPA Brake Boosters are tested at the end of the production line with proprietary equipment, and the remanufacturing process includes new replacement and specially treated components to help maintain vacuum seal integrity and consistent assist. For buyers searching for a Subaru Legacy brake booster, Subaru Forester brake booster, or Subaru Outback brake booster, B3143 provides a direct-fit replacement option for the listed vehicles.

What It Helps Fix

• Hard brake pedal feel.
• Reduced braking assist.
• Vacuum seal loss in the booster assembly.
• Pressure transfer issues in the brake assist system.
• Failure of the original booster unit.

Installation Notes

Verify the vehicle’s booster configuration, stud thread size, and master cylinder compatibility before installation. This unit is supplied without a master cylinder, brake pedal rod extension, gasket, seal, mounting bracket, or front seal, so reuse or source any required related components separately. Confirm fitment against the listed Subaru Legacy, Subaru Forester, or Subaru Outback application before beginning service.

Quality Assurance

MPA Electrical subjects each unit to 100% end-of-line testing using proprietary test equipment. Part number B3143 is a remanufactured brake booster built to standard replacement specifications for the listed Subaru applications.