MPA Electrical B1133 Power Brake Booster

Remanufactured Vacuum Brake Booster for GM B-Body

The MPA Electrical B1133 remanufactured vacuum power brake booster is built for drivers who need consistent brake assist and a firm, predictable pedal feel. It is a standard replacement vacuum booster for select Buick, Chevrolet, and Cadillac full-size rear-wheel-drive applications.

MPA Electrical’s Reman Vac Pwr Brake Booster w/o Master Cyl line focuses on restored vacuum sealing, reliable pressure transfer, and end-of-line testing for consistent output. This B1133 unit is remanufactured with treated replacement components and is supplied without a master cylinder.

Key Features

• Remanufactured vacuum power brake booster
• Standard replacement brake service grade
• 11.05 in. diaphragm diameter (280.67 mm)
• Metal housing construction
• 2 mounting studs
• 10 x 1.50 mm master cylinder stud thread size
• Master cylinder not included
• Brake pedal rod extension not included
• Mounting bracket, gasket/seal, and front seal not included

Vehicle Fitment

• Fits 1994-1996 Buick Roadmaster, N/A
• Fits 1994-1996 Chevrolet Caprice, N/A
• Fits 1994-1995 Cadillac Commercial Chassis, N/A
• Fits 1994-1995 Cadillac Fleetwood, N/A

Detailed Description

Choose the MPA Electrical B1133 when replacing a worn vacuum brake booster on a 1994-1996 Buick Roadmaster, 1994-1996 Chevrolet Caprice, or 1994-1995 Cadillac Fleetwood and Commercial Chassis. This reman brake booster is engineered to restore vacuum assist so the brake pedal requires less effort during normal stopping and emergency braking.

The B1133 is a direct-fit style power brake booster for GM B-body applications that use a vacuum booster with an 11.05-inch diaphragm. It is a practical replacement for vehicles showing reduced assist, hard pedal feel, or inconsistent braking response. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Problems This Part Can Address

• Hard brake pedal feel
• Reduced vacuum assist during braking
• Longer pedal travel before braking response
• Inconsistent brake boost after booster wear
• Vacuum seal loss in the brake booster assembly

Installation Notes and Tips

Verify master cylinder fitment, pushrod setup, and mounting stud alignment before installation. Because the master cylinder is not included, transfer or replace related brake components as needed and inspect the vacuum supply hose, check valve, and pedal linkage for wear before completing the job. Confirm the vehicle uses the correct 10 x 1.50 mm master cylinder stud thread size and 2-stud mounting pattern.

Quality Assurance

MPA Electrical remanufactures this brake booster with treated replacement components and subjects each unit to 100% end-of-line testing using proprietary test equipment to verify performance before release.