MPA Electrical B1085 Power Brake Booster

Remanufactured Vacuum Brake Booster for Jeep TJ and Wrangler

The MPA Electrical B1085 is a remanufactured vacuum power brake booster for Jeep TJ and Jeep Wrangler applications from 1997-2006. It is built for drivers who need consistent brake assist with lower pedal effort, using a dual-diaphragm vacuum design and metal housing for dependable pedal response.

MPA Electrical’s Reman Vac Pwr Brake Booster w/o Master Cyl line focuses on replacement boosters that are tested for vacuum sealing and pressure transfer before leaving the factory. The B1085 follows that approach with remanufactured components and end-of-line testing for Jeep TJ and Wrangler brake service.

Key Features

• Part number B1085
• Vacuum booster design with dual diaphragm construction
• Remanufactured standard replacement brake service grade
• Metal housing for OE-style fitment and durability
• 8.81 in. diaphragm diameter
• Master cylinder not included
• Brake pedal rod extension not included
• Mounting bracket not included
• Master cylinder stud thread size: 8 x 1.25 mm
• 2 mounting studs

Detailed Description

Designed for 1997-2006 Jeep TJ and 1997-2006 Jeep Wrangler brake systems, the MPA Electrical B1085 vacuum brake booster restores brake assist performance when the original booster is worn, leaking vacuum, or producing a hard pedal. The dual-diaphragm layout helps deliver strong assist with minimal pedal effort, while specially treated replacement components are used to improve vacuum sealing and pressure transfer. If you are searching for a remanufactured Jeep TJ brake booster or a Jeep Wrangler vacuum power brake booster, B1085 is a direct replacement option built around the original application.

This part cross-references OE numbers 4798158 and 4798158AB for the same application.

What It Helps Fix

• Hard brake pedal feel
• Reduced brake assist during stopping
• Vacuum leak symptoms at the booster
• Inconsistent pedal response
• Brake performance loss caused by a failing booster

Installation Notes and Tips

Verify master cylinder compatibility before installation, since the master cylinder is not included. Confirm the 8 x 1.25 mm stud thread size and 2-stud mounting layout match the vehicle’s brake setup. Inspect the vacuum supply, pedal linkage, and mounting surfaces during replacement to help ensure proper brake assist after installation.

Quality Assurance

MPA Electrical subjects each unit to 100% end-of-line testing using proprietary test equipment to verify vacuum seal and pressure transfer performance. The remanufactured construction and tested output support consistent brake booster operation for Jeep TJ and Jeep Wrangler service.