MPA Electrical B1389 Power Brake Booster

Remanufactured Vacuum Brake Booster for Colorado and Canyon

MPA Electrical B1389 is a remanufactured vacuum power brake booster built for 2009-2012 Chevrolet Colorado and 2009-2012 GMC Canyon applications. It is engineered for strong braking assist with reduced pedal effort, using new replacement and specially treated components to support vacuum sealing and pressure transfer.

The MPA Electrical brake booster line focuses on remanufactured replacement units that are tested before release. B1389 is a standard replacement vacuum booster with a metal housing, 248.92 mm (9.8 in.) diaphragm diameter, and 8 x 1.25 mm master cylinder stud thread size.

Key Features

• Remanufactured vacuum power brake booster
• Standard replacement brake service grade
• Metal housing construction
• 248.92 mm / 9.8 in. diaphragm diameter
• 2 mounting studs
• 8 x 1.25 mm master cylinder stud thread size
• Master cylinder not included
• Brake pedal rod extension not included
• Mounting bracket not included

Detailed Product Overview

MPA Electrical B1389 is designed for drivers who need consistent brake assist from a vacuum booster replacement. It is built for Chevrolet Colorado and GMC Canyon models from 2009 through 2012, making it a direct-fit option for common brake system service on these trucks. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

As a remanufactured unit, B1389 uses renewed and specially treated components to help maintain vacuum integrity and dependable pedal response. The booster is supplied without a master cylinder, so it is intended for service where the existing master cylinder is retained or replaced separately.

Common Problems This Part Can Address

• Hard brake pedal feel
• Reduced brake assist from a failing vacuum booster
• Inconsistent pedal response during braking
• Vacuum seal loss in the brake booster assembly
• Brake system service on 2009-2012 Chevrolet Colorado and GMC Canyon models

Installation Notes and Tips

Verify the master cylinder stud thread size, mounting stud layout, and booster style before installation. Because the master cylinder is not included, inspect the existing master cylinder and related brake components for wear, leaks, or contamination before reassembly. Confirm proper vacuum supply, pedal linkage alignment, and brake system bleeding after installation.

Quality Assurance

MPA Electrical subjects each brake booster to 100% end-of-line testing using proprietary test equipment. That process helps confirm vacuum seal performance and pressure transfer before the unit is released for service.