MPA Electrical NM55525 Brake Master Cylinder

Brake Master Cylinder for Lexus GS Front Disc Brakes

Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM55525. It is a standard replacement brake hydraulic component for Lexus GS models equipped with front disc brakes, including GS300, GS430, GS450h, and GS460 applications.

Built with an aluminum master cylinder body, plastic reservoir, and included push rod and reservoir, this unit is engineered to match OE-style braking performance for direct hydraulic system service.

Key Features

• Brake master cylinder for brake hydraulic repair
• Fits 2006 Lexus GS300, N/A, new with front disc brakes
• Fits 2006 Lexus GS430, N/A, new with front disc brakes
• Fits 2007-2011 Lexus GS450h, N/A, new with front disc brakes
• Fits 2008-2011 Lexus GS460, N/A, new with front disc brakes
• Aluminum master cylinder construction with plastic reservoir
• 0.75 in. bore diameter for standard replacement service
• Includes reservoir and push rod
• Uses DOT 3 brake fluid
• New condition, with two mounting holes and 0.352 in. mounting hole diameter

Product Details

MPA Electrical NM55525 is a brake master cylinder engineered to restore braking performance in Lexus GS applications with front disc brakes. The unit is tested against OE specifications using controlled validation processes and an OE sample library, helping ensure consistent hydraulic operation out of the box. This part cross-references Monroe Shocks & Struts (e.g., 172286) for the same application.

The MPA Electrical New with front disc brakes product line focuses on direct-fit brake hydraulic replacement parts for vehicles that require OE-style function and fit. For Lexus GS300, GS430, GS450h, and GS460 models, NM55525 provides the core hydraulic control needed to maintain pedal feel and brake system response.

What It Helps Address

• Low or inconsistent brake pedal feel
• Internal master cylinder leakage
• Brake fluid loss at the hydraulic unit
• Delayed brake response during pedal application
• Brake system performance issues related to worn hydraulic seals

Installation Notes

Verify vehicle fitment by year, model, and front disc brake configuration before installation. This master cylinder includes the reservoir and push rod, but does not include mounting hardware, gasket or seal, brake booster, sensor, mounting bracket, or brake pressure switch. Use DOT 3 brake fluid and bleed the brake system thoroughly after installation to remove trapped air and restore proper pedal feel.

Quality Assurance

MPA Electrical tests each brake master cylinder against OE specifications using proprietary processes and strict protocols. Part number NM55525 is a new standard replacement component built for brake hydraulic service on Lexus GS applications.