MPA Electrical NM3031 Brake Master Cylinder

Brake Master Cylinder for Front Disc Brake Applications

Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM3031. It is a standard replacement unit built for vehicles equipped with front disc brakes, including Buick, Oldsmobile, Pontiac, and Cadillac applications from the 1990-1999 model years.

MPA Electrical uses OE sample data and testing protocols to verify each master cylinder against original specifications for dependable braking performance after installation.

Key Features

• Brake master cylinder for front disc brake applications
• Standard replacement grade for direct service use
• Aluminum master cylinder body with plastic reservoir
• 1-inch bore diameter
• Reservoir included with cap installed
• Uses DOT 3 brake fluid
• Two mounting holes with 0.408-inch mounting hole diameter
• New condition, part number NM3031

Vehicle Fitment

• Fits 1995-1999 Oldsmobile Aurora, N/A, New with front disc brakes
• Fits 1995-1998 Buick Riviera, N/A, New with front disc brakes
• Fits 1990-1995 Buick LeSabre, N/A, New with front disc brakes
• Fits 1991-1995 Buick Park Avenue, N/A, New with front disc brakes
• Fits 1992-1995 Oldsmobile 88, N/A, New with front disc brakes
• Fits 1991-1995 Oldsmobile 98, N/A, New with front disc brakes
• Fits 1991-1995 Pontiac Bonneville, N/A, New with front disc brakes
• Fits 1993 Cadillac 60 Special, N/A, New with front disc brakes
• Fits 1991-1993 Cadillac DeVille, N/A, New with front disc brakes
• Fits 1991-1992 Cadillac Fleetwood, N/A, New with front disc brakes
• Fits 1991 Oldsmobile Delta 88, N/A, New with front disc brakes

Detailed Description

This brake master cylinder is engineered for vehicles that use front disc brakes and require a 1-inch bore for proper hydraulic pressure delivery. The aluminum housing helps provide a durable service replacement, while the included plastic reservoir and cap simplify fluid service and inspection. NM3031 cross-references OE-style part numbers 25558388 and 25605860 for the same application.

Compatible With Buick LeSabre, Buick Park Avenue, Buick Riviera, Oldsmobile Aurora, Oldsmobile 88, Oldsmobile 98, Pontiac Bonneville, Cadillac DeVille, Cadillac Fleetwood, Cadillac 60 Special, and Oldsmobile Delta 88 applications listed above, this master cylinder is a direct-fit service part for front disc brake systems.

Common Brake Issues It Can Help Address

• Low or inconsistent brake pedal feel
• Internal hydraulic leakage in the master cylinder
• Brake fluid loss at the master cylinder assembly
• Reduced braking response from worn hydraulic components
• Brake warning concerns tied to master cylinder wear

Installation Notes and Tips

Before installation, confirm the vehicle is listed for the correct year, make, model, and front disc brake configuration. Bench bleed the master cylinder before connecting brake lines, then fill with DOT 3 brake fluid and bleed the system thoroughly to remove trapped air. Inspect the brake booster, lines, and wheel cylinders or calipers for leaks or wear before returning the vehicle to service.

Quality Assurance

MPA Electrical tests each master cylinder against OE specifications using sample-based validation and controlled inspection processes. That approach helps ensure consistent hydraulic performance and proper fitment for the listed Buick, Oldsmobile, Pontiac, and Cadillac applications. Part number NM3031 is supplied as a new replacement component.