MPA Electrical NM55422 Brake Master Cylinder

Brake Master Cylinder for Lexus and Toyota

Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM55422. It is a standard replacement unit for vehicles with front disc brakes, including Lexus RX350, Lexus RX350L, Toyota Sienna, and Toyota Highlander applications.

Key Features

• Standard replacement brake master cylinder for hydraulic brake system service
• Aluminum master cylinder body for OE-style fit and function
• 0.877 in. bore diameter for matched hydraulic performance
• Two mounting holes with 0.354 in. mounting hole diameter
• Gasket or seal included; dust boot, reservoir, cap, push rod, sensor, brake pressure switch, and mounting hardware are not included
• New condition, built for vehicles equipped with front disc brakes

Product Details

MPA Electrical NM55422 is engineered as a brake master cylinder replacement for 2010-2022 Lexus RX350, 2018-2022 Lexus RX350L, 2011-2020 Toyota Sienna, and 2008-2019 Toyota Highlander models with front disc brakes. The aluminum construction and 0.877-inch bore diameter support proper hydraulic pressure transfer in the brake system, while the included seal helps complete the service installation. This part cross-references Toyota 47201-0E060 for the same application.

The MPA Electrical New with front disc brakes product line focuses on direct-fit hydraulic brake components for common OE replacement needs. Part number NM55422 is a practical choice when replacing a worn or leaking master cylinder on a Lexus RX350, Toyota Highlander, or Toyota Sienna brake system.

Common Problems This Part Can Address

• Soft or sinking brake pedal feel caused by internal master cylinder wear
• Brake fluid leakage at the master cylinder body or seals
• Uneven hydraulic pressure delivery in the brake system
• Reduced braking response after master cylinder deterioration
• Brake warning symptoms related to master cylinder failure

Installation Notes and Tips

Before installation, confirm the vehicle is equipped with front disc brakes and verify bore size, mounting hole layout, and hydraulic line connections. Bench bleeding is recommended after installation to remove trapped air from the master cylinder and help restore firm pedal feel. Because mounting hardware, reservoir, cap, push rod, and brake pressure switch are not included, reuse or source the required related components as needed for the repair.

Quality Assurance

According to MPA Electrical, each brake master cylinder is checked against OE specifications using controlled testing procedures and an OE sample library to help ensure consistent braking performance out of the box.