MPA Electrical B1042 Power Brake Booster

Reman Vacuum Brake Booster for GM SUVs

Restore consistent brake assist with this remanufactured vacuum power brake booster from MPA Electrical. Part number B1042 is built for direct replacement use on select Chevrolet, GMC, Buick, Oldsmobile, Isuzu, and Saab applications, including Trailblazer, Envoy, and Bravada models.

MPA Electrical’s Reman Vac Pwr Brake Booster w/o Master Cyl line focuses on vacuum seal integrity, smooth pressure transfer, and end-of-line testing for dependable pedal response. This B1042 unit is a standard replacement vacuum booster with a dual diaphragm design and metal housing.

Key Features

• Remanufactured power brake booster for vacuum-assisted brake systems
• Dual diaphragm design for braking assist with reduced pedal effort
• Standard replacement brake service grade
• Metal housing construction
• Master cylinder not included
• No gasket or seal included
• 10 x 1.50 master cylinder stud thread size
• 2 mounting studs
• 11.08 in. diaphragm diameter

Detailed Description

MPA Electrical B1042 is a reman vacuum power brake booster engineered for vehicles that rely on vacuum assist to multiply pedal force at the master cylinder. The dual diaphragm layout helps deliver steady assist, while remanufactured and specially treated components are used to support vacuum sealing and pressure transfer. This part is a direct-fit style replacement for select 2002-2006 Chevrolet Trailblazer, GMC Envoy, Buick Rainier, Oldsmobile Bravada, Isuzu Ascender, Chevrolet SSR, GMC Envoy XL, GMC Envoy XUV, Chevrolet Trailblazer EXT, and Saab 9-7x applications.

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

What It Helps Fix

• Hard brake pedal feel caused by weak vacuum assist
• Reduced braking response during normal driving
• Loss of consistent pedal assist from a failing booster diaphragm or seal
• Brake assist issues on Chevrolet Trailblazer and GMC Envoy platforms
• Brake performance concerns on Buick Rainier, Bravada, and related GM SUVs

Installation Notes and Tips

Verify vacuum brake booster fitment by year, make, and model before installation. This unit does not include the master cylinder, brake pedal rod extension, gasket, seal, or mounting bracket. Confirm the 10 x 1.50 master cylinder stud thread size and 2-stud mounting layout match the original part on the vehicle.

• Fits 2003-2006 Chevrolet SSR, N/A
• Fits 2004-2005 Buick Rainier, N/A
• Fits 2002-2005 Chevrolet Trailblazer, N/A
• Fits 2002-2005 Chevrolet Trailblazer EXT, N/A
• Fits 2002-2005 GMC Envoy, N/A
• Fits 2002-2005 GMC Envoy XL, N/A
• Fits 2004-2005 GMC Envoy XUV, N/A
• Fits 2003-2005 Isuzu Ascender, N/A
• Fits 2005 Saab 9-7x, N/A
• Fits 2002-2004 Oldsmobile Bravada, N/A

Quality Assurance

MPA Electrical states that these brake boosters are tested at the end of the production line using proprietary equipment to verify performance before release. The remanufactured construction and treated components are used to support reliable vacuum sealing and braking assist.