MPA Electrical B1127 Power Brake Booster

Vacuum Brake Booster Overview

MPA Electrical B1127 is a remanufactured vacuum power brake booster built for standard replacement use. It is engineered to deliver strong braking assist with reduced pedal effort, and it is tested at the end of the production line for consistent output.

Key Features

• Vacuum booster design with dual diaphragms for braking assist.
• Remanufactured metal housing for a direct replacement-style fit.
• No master cylinder, gasket, seal, or mounting bracket included.
• 11.02 in. diaphragm diameter with 10 x 1.50 mm master cylinder stud threads.
• Two mounting studs for secure installation.

Detailed Description

This MPA Electrical brake booster, part number B1127, is built to restore vacuum-assisted braking performance in applications that use a standard replacement booster. The dual-diaphragm vacuum design helps transfer pedal input into stronger assist, while treated replacement components are used to support vacuum sealing and pressure transfer. The metal housing and remanufactured construction make it a practical choice for service work on Buick Roadmaster, Chevrolet Caprice, and related full-size GM applications. This part cross-references 18020351 and 18060177 for the same application.

What It Helps Address

• Hard brake pedal feel caused by a weak booster.
• Reduced braking assist during normal pedal application.
• Vacuum seal loss that affects booster performance.
• Brake response issues tied to worn internal booster components.

Installation Notes and Tips

Verify vacuum booster style, diaphragm size, stud thread size, and mounting layout before installation. This unit does not include the master cylinder, pedal rod extension, gasket, seal, or mounting bracket, so reuse or source those components as needed. Confirm fitment on 1991-1993 Buick Roadmaster, 1991-1993 Chevrolet Caprice, 1991-1992 Oldsmobile Custom Cruiser, and 1993 Cadillac Commercial Chassis or Fleetwood applications.

Quality Assurance

MPA Electrical subjects each unit to 100% end-of-line testing using proprietary test equipment to verify braking assist performance and pressure transfer.