MPA Electrical NM2185 Brake Master Cylinder

Brake Master Cylinder for GM Front Disc Brake Applications

The MPA Electrical NM2185 brake master cylinder is a standard replacement for select Buick, Oldsmobile, Pontiac, and Chevrolet vehicles with front disc brakes. It is built with an aluminum body, a 0.945-inch bore, and an included reservoir and cap for a direct hydraulic service replacement.

Compatible With 1987-1993 Buick Century, 1990-1993 Oldsmobile Cutlass, 1987-1993 Oldsmobile Cutlass Ciera, 1987-1991 Pontiac 6000, 1987-1989 Chevrolet Celebrity, 1987-1988 Oldsmobile Firenza, 1987-1988 Pontiac Sunbird, and 1987 Buick Skylark, all noted for front disc brake applications. The NM2185 is also a fitment-based search match for drivers replacing a worn brake master cylinder on these GM platforms.

Key Features

• Standard replacement brake master cylinder for hydraulic brake service
• Aluminum construction for a lightweight, OE-style service part
• 0.945-inch master cylinder bore diameter
• Reservoir and master cylinder cap included
• Uses DOT 3 brake fluid
• Two mounting holes with 0.425-inch mounting hole diameter
• New product condition

Product Details

MPA Electrical builds this brake master cylinder to restore braking performance using OE-based sample data and testing protocols aligned to original specifications. The NM2185 is a direct-fit hydraulic replacement for front disc brake vehicles in the listed Buick, Oldsmobile, Pontiac, and Chevrolet applications, including Buick Century, Oldsmobile Cutlass Ciera, and Chevrolet Celebrity. This part cross-references 18011328 and 18014409 for the same application.

Common Problems This Part Can Address

• Low or inconsistent brake pedal response
• Internal hydraulic leakage in the master cylinder
• Brake fluid loss at the master cylinder assembly
• Reduced braking performance from worn internal seals
• Need for a replacement master cylinder on front disc brake GM vehicles

Installation Notes and Tips

• Verify vehicle brake configuration before ordering; this listing is for front disc brake applications.
• Bench bleed the master cylinder before installation to reduce trapped air in the hydraulic system.
• Use DOT 3 brake fluid only, as specified.
• Transfer any required external components from the original setup if your vehicle uses them, since mounting hardware, push rod, brake booster, and pressure switch are not included.
• Inspect brake lines, wheel cylinders, calipers, and hoses during installation to confirm the system is fully sealed.

Quality Assurance

MPA Electrical tests each unit against OE specifications using controlled processes and a large OE sample library to support consistent brake pedal feel and hydraulic performance out of the box. Part number NM2185 is a new standard replacement master cylinder for service on the listed GM front disc brake vehicles.