MPA Electrical B1128 Power Brake Booster

Remanufactured Vacuum Brake Booster for Classic GM Applications

MPA Electrical B1128 is a remanufactured vacuum power brake booster built for classic full-size GM vehicles that need consistent brake assist and a firm, predictable pedal feel. This standard replacement unit uses a dual-diaphragm design and a metal housing to support reliable vacuum sealing and pressure transfer.

Compatible with select Buick LeSabre and Riviera, Chevrolet Caprice, Impala, Bel Air, Oldsmobile 98, Delta 88, Custom Cruiser, Toronado, and Pontiac Bonneville, Catalina, Laurentian, and Parisienne applications. If you are replacing a worn vacuum booster on a 1971-1978 Chevrolet Impala or a 1971-1979 Buick LeSabre, B1128 is built for direct service replacement use.

Key Features

• Remanufactured vacuum power brake booster
• Standard replacement brake service grade
• Dual-diaphragm construction for brake assist
• Metal housing for durable service
• 11.02 in. diaphragm diameter (279.91 mm)
• Master cylinder not included
• Brake pedal rod extension not included
• Mounting bracket not included
• Front seal and gasket or seal not included
• Master cylinder stud thread size: 3/8-16
• Two mounting studs

Product Details

The MPA Electrical Brand Line, Reman Vac Pwr Brake Booster w/o Master Cyl, focuses on remanufactured vacuum boosters for vehicles that rely on vacuum assist rather than hydraulic boost. B1128 is engineered and tested to deliver braking assist with reduced pedal effort, while new replacement and specially treated internal components help maintain vacuum integrity and dependable pressure transfer. Each unit is 100% end-of-line tested with proprietary equipment before release.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application. Part number B1128 is also referenced for service lookup and ordering on classic GM brake booster applications.

What It Helps Address

• Hard brake pedal feel from a weak or leaking booster
• Reduced brake assist during normal stopping
• Vacuum loss caused by worn internal booster components
• Inconsistent pedal response in older brake systems
• Replacement needs on aging full-size GM brake hardware

Installation Notes

Verify master cylinder fitment separately, since the master cylinder is not included with this booster. Confirm the 3/8-16 stud thread size, two-stud mounting pattern, and vehicle-specific pedal rod and bracket requirements before installation. B1128 is a vacuum booster, so the vehicle must be equipped for vacuum-assisted brake operation.

• Fits 1971-1979 Buick LeSabre
• Fits 1971-1976 Buick Riviera
• Fits 1971-1978 Chevrolet Caprice
• Fits 1971-1978 Chevrolet Impala
• Fits 1971-1975 Chevrolet Bel Air
• Fits 1971-1976 Oldsmobile 98
• Fits 1971-1976 Oldsmobile Delta 88
• Fits 1971-1977 Oldsmobile Custom Cruiser
• Fits 1971-1978 Oldsmobile Toronado
• Fits 1971-1978 Pontiac Bonneville
• Fits 1971-1978 Pontiac Catalina
• Fits 1976-1978 Pontiac Laurentian
• Fits 1976 Pontiac Parisienne
• Fits 1978 Pontiac Parisienne
• Fits 1978 Buick Riviera

Quality Assurance

MPA Electrical remanufactures this brake booster with replacement and specially treated components, then subjects each unit to 100% end-of-line testing to confirm performance before it leaves the production process.