MPA Electrical B5085 Power Brake Booster

Hydraulic Brake Booster for Ram HD Trucks

MPA Electrical B5085 is a remanufactured hydraulic power brake booster built for consistent brake assist and reduced pedal effort. It is a standard replacement hydraulic booster for select Ram 2500, Ram 3500, and Ram 4000 applications, with the master cylinder sold separately.

The MPA Electrical Reman Hyd Pwr Brake Booster w/o Master Cyl line focuses on remanufactured hydraulic brake assist components that are tested for pressure transfer and vacuum sealing performance. For Ram 2500 and Ram 3500 brake service, this product line is aimed at restoring factory-style pedal feel with a direct-fit replacement approach.

Key Features

• Remanufactured hydraulic power brake booster
• Standard replacement brake service grade
• Metal housing for durable construction
• Mounting bracket included
• Master cylinder not included
• Brake pedal rod extension not included
• Gasket or seal not included
• 2 mounting studs with 3/8-16 master cylinder stud thread size

Detailed Description

MPA Electrical B5085 is engineered for hydraulic brake assist applications where reliable pressure transfer and controlled pedal effort are critical. Each unit is remanufactured with new replacement and specially treated components, then end-of-line tested with proprietary equipment to verify performance before release. This makes it a practical choice for drivers servicing brake booster concerns on 2012-2018 Ram 2500, 2012-2018 Ram 3500, and 2012-2017 Ram 4000 trucks.

This part cross-references Mopar (e.g., 52013874AF, 68144663AA) for the same application. If you are replacing a hydraulic brake booster on a Ram HD truck, B5085 provides a direct replacement path without the master cylinder included.

What It Helps Fix

• Hard brake pedal feel
• Reduced brake assist from a failing hydraulic booster
• Inconsistent pedal response during braking
• Brake booster leakage or pressure transfer loss
• Brake system performance issues tied to booster wear

Installation Notes and Tips

Verify hydraulic booster style, mounting points, and master cylinder compatibility before installation. This unit includes the mounting bracket and uses 2 mounting studs with a 3/8-16 master cylinder stud thread size. The master cylinder, brake pedal rod extension, and sealing components are not included, so inspect related brake system parts and replace worn items as needed during service.

Compatible With 2012-2018 Ram 2500, N/A; 2012-2018 Ram 3500, N/A; and 2012-2017 Ram 4000, N/A. Confirm the vehicle’s brake configuration against the original part number B5085 before installation.

Quality Assurance

MPA Electrical remanufactured brake boosters are subjected to 100% end-of-line testing using proprietary test equipment to check assist performance and sealing integrity. The remanufacturing process uses new replacement and specially treated components to support consistent operation in hydraulic brake applications.