MPA Electrical B1055 Power Brake Booster

Reman Vacuum Brake Booster for S10 and Sonoma

Restore brake assist on your 1994 Chevrolet S10 or 1994 GMC Sonoma with this remanufactured vacuum power brake booster from MPA Electrical. Part number B1055 is built for standard replacement service and is engineered to deliver strong vacuum-assisted braking with reduced pedal effort.

MPA Electrical’s Reman Vac Pwr Brake Booster w/o Master Cyl line focuses on replacement units that are tested for vacuum seal integrity and pressure transfer performance. This booster is supplied without a master cylinder and uses a dual-diaphragm vacuum design for consistent assist in everyday driving.

Key Features

• Brand: MPA Electrical
• Part number: B1055
• Remanufactured vacuum power brake booster
• Dual diaphragm design for braking assist
• Metal housing construction
• Standard replacement brake service grade
• Master cylinder not included
• 10 X 1.5 master cylinder stud thread size
• 2 mounting studs
• Interchange reference: 18022131

Detailed Description

This MPA Electrical brake booster is a remanufactured vacuum unit designed for direct replacement service on 1994 Chevrolet S10 and 1994 GMC Sonoma applications. The dual diaphragm, 10.67-inch booster uses vacuum assist to reduce pedal effort and improve pressure transfer at the brake pedal. The housing is metal, and the unit is built as a standard replacement part for vehicles that need restored brake assist performance. Part number B1055 is also a useful reference when searching for a reman vacuum brake booster for 1994 Chevrolet S10 or 1994 GMC Sonoma brake repair.

The MPA Electrical brake booster product line is focused on remanufactured brake assist components that are tested before release. Each unit is subjected to end-of-line testing to verify vacuum sealing and operating performance. If you are replacing a worn booster on a 1994 Chevrolet S10 or 1994 GMC Sonoma, B1055 provides the correct vacuum booster format without a master cylinder.

This part cross-references 18022131 for the same application.

What It Helps Fix

• Hard brake pedal feel
• Reduced brake assist from a leaking vacuum booster
• Inconsistent pedal response during braking
• Brake assist loss caused by internal diaphragm wear
• Vacuum seal problems that affect stopping performance

Installation Notes and Tips

Verify master cylinder compatibility before installation, since this booster does not include a master cylinder. Confirm the 10 X 1.5 stud thread size and the 2-stud mounting layout match the vehicle’s brake system before assembly. Inspect the vacuum hose, check valve, and mounting surfaces for wear or damage during replacement to help ensure proper brake assist operation.

Quality Assurance

MPA Electrical remanufactures this booster with new replacement and specially treated components, then tests each unit at the end of the line to confirm vacuum seal and pressure transfer performance. That process supports consistent brake assist output for 1994 Chevrolet S10 and 1994 GMC Sonoma applications.