MPA Electrical B1140 Power Brake Booster

Vacuum Brake Booster for Classic GM Trucks

MPA Electrical B1140 is a remanufactured vacuum power brake booster built for direct replacement service on select 1971-1972 Chevrolet C20 Suburban and K20 Suburban applications. It is engineered to deliver strong braking assist with reduced pedal effort, helping restore consistent brake feel in older vacuum-assisted systems.

The MPA Electrical Reman Vac Pwr Brake Booster w/o Master Cyl line focuses on replacement-ready components and end-of-line testing for dependable vacuum sealing and pressure transfer. This B1140 unit is supplied without the master cylinder, so it is intended for service where the booster is being replaced separately.

Key Features

• Remanufactured vacuum power brake booster
• Standard replacement brake service grade
• Metal housing construction
• 11.02 in. diaphragm diameter (279.91 mm)
• 2 mounting studs with 3/8-16 master cylinder stud thread size
• No master cylinder included
• No brake pedal rod extension included
• No gasket, seal, front seal, or mounting bracket included

Detailed Description

MPA Electrical B1140 is a vacuum booster assembly designed for 1971-1972 Chevrolet C20 Suburban and 1971-1972 Chevrolet K20 Suburban models. As a remanufactured power brake booster, it is built to restore vacuum-assisted braking performance in vehicles that rely on pedal vacuum assist rather than hydraulic boost. The 11.02-inch diaphragm and metal housing support stable assist output, while the remanufacturing process includes replacement and treatment of key components to improve vacuum sealing and pressure transfer. This part number, B1140, is a practical choice when servicing a worn booster on a classic Chevrolet C20 Suburban or K20 Suburban.

Common Brake Issues It Can Address

• Hard brake pedal feel
• Reduced vacuum assist during braking
• Inconsistent pedal response
• Brake booster vacuum leakage
• Loss of braking assist on older vacuum systems

Installation Notes and Tips

Verify master cylinder compatibility before installation, since the master cylinder is not included. Confirm the 3/8-16 stud thread size, mounting stud layout, and pedal linkage condition before swapping the booster. For best results, inspect the vacuum supply line, check valve, and related brake components during service on 1971-1972 Chevrolet C20 Suburban and K20 Suburban models.

Quality Assurance

MPA Electrical subjects each unit to 100% end-of-line testing using proprietary test equipment to verify performance before release. The remanufactured construction and tested vacuum sealing help support reliable brake assist in standard replacement service.