MPA Electrical B1225 Power Brake Booster

Vacuum Brake Booster for Silverado and Sierra

MPA Electrical B1225 is a remanufactured vacuum power brake booster for select GM full-size trucks. It is built to restore braking assist with lower pedal effort for 2007-2011 Chevrolet Silverado 1500, 2007-2011 Chevrolet Cheyenne, and 2007-2011 GMC Sierra 1500 applications.

The MPA Electrical brake booster line is engineered for dependable vacuum sealing, consistent pressure transfer, and verified end-of-line performance. This reman vac pwr brake booster w/o master cyl is a standard replacement part for drivers replacing a worn or leaking booster on compatible Chevrolet Silverado 1500 and GMC Sierra 1500 models.

• Part number: B1225
• Brake service grade: Standard Replacement
• Booster type: Vacuum
• Remanufactured metal housing
• 10.8 in. diaphragm diameter
• Master cylinder not included
• Brake pedal rod extension not included
• Mounting bracket not included
• Front seal not included
• Master cylinder stud thread size: 10 x 1.5 mm
• 2 mounting studs

Detailed Product Overview

MPA Electrical B1225 is a vacuum power brake booster designed for direct replacement in select 2007-2011 Chevrolet Silverado 1500, Chevrolet Cheyenne, and GMC Sierra 1500 trucks. The remanufactured construction uses treated replacement components to help maintain vacuum integrity and stable brake assist performance. This unit is supplied without a master cylinder, making it a focused replacement for the booster assembly itself. Cross-reference part numbers include 19417213 and 84164390 for the same application.

Common Brake Booster Symptoms

• Hard brake pedal feel during normal driving
• Reduced brake assist when stopping
• Vacuum leak noise near the booster area
• Longer pedal travel before braking response
• Brake assist loss after booster wear or seal failure

Installation Notes

Verify the vehicle’s brake booster configuration before installation and confirm the master cylinder stud thread size is 10 x 1.5 mm. Because the master cylinder, gasket or seal, front seal, mounting bracket, and pedal rod extension are not included, reuse or source the required related components as needed for the repair. Always inspect the vacuum supply, pushrod alignment, and brake system condition before returning the vehicle to service.

Quality Assurance

MPA Electrical subjects each booster to 100% end-of-line testing using proprietary test equipment to confirm performance before release. The remanufacturing process is focused on vacuum seal integrity and reliable pressure transfer for consistent brake assist.