MPA Electrical NM55491 Brake Master Cylinder

Brake Master Cylinder for Hyundai and Kia

Restore consistent brake pedal response with this new brake master cylinder from MPA Electrical. Part number NM55491 is a standard replacement unit built with an aluminum body and a 1.001-inch bore for vehicles equipped with front disc brakes.

Compatible With 2009-2014 Hyundai Genesis, 2011-2016 Hyundai Equus, and 2015-2017 Kia K900, this brake master cylinder is built for direct hydraulic replacement in the listed applications. It uses DOT 3 or DOT 4 brake fluid and is supplied without the reservoir, cap, push rod, brake booster, sensor, or mounting hardware.

Key Features

• MPA Electrical NM55491 brake master cylinder
• Standard replacement grade for hydraulic brake service
• Aluminum construction for the master cylinder body
• 1.001-inch bore diameter
• Two mounting holes with 0.34-inch mounting hole diameter
• For vehicles with front disc brakes
• Uses DOT 3 or DOT 4 brake fluid
• New product condition

Product Details

The NM55491 is engineered to restore braking performance by replacing a worn or leaking master cylinder with a unit tested against OE specifications. MPA Electrical uses OE sample data and controlled testing processes to verify consistent hydraulic performance before the part leaves production. This part cross-references 585103M000 for the same application.

Use this brake master cylinder on 2009-2014 Hyundai Genesis, 2011-2016 Hyundai Equus, and 2015-2017 Kia K900 applications with front disc brakes. The MPA Electrical NM55491 is a practical OE-style solution for drivers addressing pedal travel changes, hydraulic leakage, or uneven brake response in these vehicles.

Common Reasons for Replacement

• Brake pedal sinks or feels soft
• Visible brake fluid leakage around the master cylinder
• Loss of hydraulic pressure in the brake system
• Inconsistent braking response after wear or internal seal failure
• Need to replace a damaged original master cylinder on Hyundai Genesis, Hyundai Equus, or Kia K900

Installation Notes

Verify vehicle fitment by year, make, model, and brake configuration before installation. Transfer or source the reservoir, cap, push rod, and mounting hardware as needed, since they are not included. Bench bleeding the master cylinder before installation helps reduce trapped air and supports proper brake pedal feel after the system is filled with DOT 3 or DOT 4 fluid.

Quality Assurance

MPA Electrical tests each unit against OE specifications using proprietary processes and strict protocols to support consistent braking performance out of the box. The NM55491 is a new standard replacement brake master cylinder built for the listed Hyundai and Kia applications.