MPA Electrical NM4289 Brake Master Cylinder

Brake Master Cylinder for Corvette and XLR

Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM4289. It is a standard replacement unit built for 2009-2013 Chevrolet Corvette models with front disc brakes and 2009 Cadillac XLR models with front disc brakes.

MPA Electrical’s New with front disc brakes product line focuses on direct-fit brake hydraulics for vehicles that need dependable OE-style replacement performance. This master cylinder is tested against OE specifications using controlled processes and sample-based validation to help deliver consistent braking performance after installation.

Key Features

• Brand: MPA Electrical
• Part number: NM4289
• Brake master cylinder with 1-inch bore diameter
• Aluminum master cylinder construction
• Reservoir included
• Master cylinder cap included
• Gasket or seal included
• Standard replacement grade
• Uses DOT 3 brake fluid
• Mounting hole quantity: 2
• New product condition

Detailed Description

NM4289 is a brake master cylinder engineered for vehicles equipped with front disc brakes, including the Chevrolet Corvette and Cadillac XLR applications listed below. The aluminum body, 1-inch bore, included reservoir, cap, and seal support a direct replacement for worn or leaking hydraulic components in the brake system. This unit does not include a brake booster, push rod, sensor, pressure switch, mounting hardware, or mounting bracket.

Fits 2009-2013 Chevrolet Corvette, N/A, new with front disc brakes. Fits 2009 Cadillac XLR, N/A, new with front disc brakes. This part cross-references 20955378 for the same application.

What It Helps Fix

• Low or inconsistent brake pedal feel
• Brake fluid leakage from the master cylinder area
• Internal hydraulic bypass that reduces braking pressure
• Brake performance loss caused by a worn bore or seals
• Restoration needs after master cylinder failure on Corvette or XLR brake systems

Installation Notes and Tips

Verify the vehicle’s brake configuration before installation, especially the front disc brake application and bore size. Bench bleeding the master cylinder before final installation helps remove trapped air from the hydraulic circuit and supports proper pedal feel. Use DOT 3 brake fluid and inspect the brake lines, fittings, and booster interface for wear or contamination during replacement.

Quality Assurance

MPA Electrical tests each unit against OE specifications using proprietary processes and strict protocols to help ensure consistent braking performance out of the box. This NM4289 master cylinder is a new standard replacement part built for dependable hydraulic operation in the listed Chevrolet Corvette and Cadillac XLR applications.