MPA Electrical B3177 Power Brake Booster

Remanufactured Vacuum Brake Booster for Lexus and Toyota

MPA Electrical B3177 is a remanufactured vacuum power brake booster built for direct replacement in select Lexus and Toyota applications. It is engineered for strong braking assist with low pedal effort, helping restore consistent brake feel in vehicles such as the Lexus RX330, Lexus RX350, and Toyota Highlander.

This MPA Electrical brake booster line focuses on vacuum seal integrity, pressure transfer, and end-of-line testing for dependable operation after installation. Part number B3177 is a standard replacement unit for drivers replacing a worn or leaking booster on compatible vehicles.

Key Features

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

Product Details

MPA Electrical reman vac pwr brake booster w/o master cyl B3177 is built for vacuum-assisted braking systems that require reliable pedal assist and stable pressure transfer. The remanufacturing process uses new replacement and specially treated components to help maintain vacuum seal performance and consistent brake response. Each unit is 100% end-of-line tested with proprietary equipment before release.

Compatible With 2007-2009 Lexus RX350, N/A; 2004-2007 Toyota Highlander, N/A; and 2004-2006 Lexus RX330, N/A. This part cross-references Toyota/Lexus OE numbers 4461048210 and 4461048220 for the same application.

Common Brake Booster Symptoms

• Hard brake pedal feel
• Reduced braking assist during stops
• Vacuum leak noise near the booster
• Inconsistent pedal response
• Brake performance loss from a failing booster diaphragm or seal

Installation Notes

Verify vacuum hose condition, master cylinder condition, and pushrod alignment before installation. Because the master cylinder is not included, transfer or replace it separately as needed and confirm the 8 x 1.25 mm stud thread size matches the application. Always bleed the brake system after service and inspect for vacuum leaks once installed.

Quality Assurance

MPA Electrical remanufactured brake boosters are tested at the end of production to confirm function and sealing performance. The brand’s remanufacturing process is focused on restoring braking assist characteristics for direct-fit replacement use in compatible Lexus RX330, Lexus RX350, and Toyota Highlander applications.