MPA Electrical B4228 Power Brake Booster

Brake Booster Overview

MPA Electrical B4228 is a remanufactured power brake booster for select Kia and Hyundai applications. It is built for drivers who need consistent braking assist and a direct replacement format without the master cylinder.

Key Features

• Standard replacement brake service grade for routine repair work.
• Metal housing with an 11.2-inch diaphragm for vacuum-assisted braking.
• Master cylinder, gasket, seal, and pedal rod extension are not included.
• Uses an 8 x 1.25 mm master cylinder stud thread size.
• Two mounting studs for secure installation.
• Remanufactured and tested as a finished unit.

Detailed Description

MPA Electrical B4228 is a reman vac power brake booster engineered to deliver strong braking assist with reduced pedal effort. The remanufactured construction uses new replacement and specially treated components to support vacuum sealing and pressure transfer, while end-of-line testing verifies unit performance before release. This part number B4228 is a practical choice for brake system service on the Hyundai Santa Fe, Hyundai Santa Fe Sport, Hyundai Santa Fe XL, and Kia Sorento.

This part cross-references Hyundai/Kia OE numbers 59110-2W300 and 59110-4Z300 for the same application.

What It Helps Solve

• Hard brake pedal feel caused by booster wear or vacuum loss.
• Reduced braking assist during normal pedal application.
• Brake response issues related to internal seal deterioration.
• Replacement needs after booster housing or diaphragm fatigue.

Installation Notes

Verify master cylinder compatibility before installation, since the master cylinder is not included. Confirm the 8 x 1.25 mm stud thread size and mounting layout against the original unit. Professional installation and brake system inspection are recommended after replacement.

Quality Assurance

MPA Electrical subjects each unit to 100% end-of-line testing using proprietary equipment to confirm performance before it leaves production. B4228 is a remanufactured standard replacement brake booster built for consistent service results.