MPA Electrical B1090 Power Brake Booster

Reman Vacuum Brake Booster for Jeep

The MPA Electrical B1090 is a remanufactured vacuum power brake booster built for Jeep Cherokee and Jeep Comanche applications. It is engineered to deliver strong braking assist with reduced pedal effort, using treated replacement components and end-of-line testing to help maintain vacuum seal and pressure transfer.

MPA Electrical’s Reman Vac Pwr Brake Booster w/o Master Cyl line focuses on standard replacement brake service parts for drivers restoring braking performance on supported vehicles. This B1090 unit is a vacuum booster only and does not include the master cylinder.

Key Features

• Remanufactured vacuum power brake booster
• Standard replacement brake service grade
• Single-diaphragm design for vacuum-assisted braking
• Metal housing construction
• 2 mounting studs
• Master cylinder not included
• Brake pedal rod extension not included
• Gasket or seal not included
• Front seal not included
• 3/8-16 master cylinder stud thread size
• Diaphragm diameter: 8.72 in. (221.49 mm)

Detailed Description

MPA Electrical B1090 is a reman vacuum brake booster designed for 1991-1994 Jeep Cherokee and 1991-1992 Jeep Comanche applications. It uses a single diaphragm vacuum design to help multiply pedal force, which can improve brake response when the original booster has lost vacuum integrity or no longer transfers pressure efficiently. The metal housing and remanufactured internal components are selected to support consistent operation in daily driving conditions.

This part cross-references Monroe Shocks & Struts (e.g., 4637769) for the same application. Use B1090 when replacing a worn booster on Jeep Cherokee or Jeep Comanche models that require a vacuum power brake booster without a master cylinder.

What It Helps Fix

• Hard brake pedal feel
• Reduced braking assist
• Vacuum leak symptoms at the booster
• Delayed or inconsistent brake response
• Booster-related pressure transfer issues

Installation Notes and Tips

Verify master cylinder compatibility before installation, since the master cylinder is not included. Confirm the 3/8-16 stud thread size, mounting stud layout, and diaphragm size against the original unit before assembly. Inspect the vacuum supply line, check valve, and pedal linkage condition during replacement to help ensure proper brake assist after installation.

Quality Assurance

MPA Electrical subjects each booster to 100% end-of-line testing using proprietary test equipment to verify performance before release. The remanufacturing process uses new replacement and specially treated components to support vacuum sealing and reliable pressure transfer.