MPA Electrical NM2686 Brake Master Cylinder

Brake Master Cylinder for GM Front Disc Brake Applications

Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM2686. It is a standard replacement master cylinder built for select Buick, Cadillac, and Chevrolet full-size vehicles with front disc brakes.

Compatible With 1994-1996 Cadillac Fleetwood, 1995-1996 Buick Roadmaster, 1995-1996 Cadillac Commercial Chassis, and 1995-1996 Chevrolet Caprice, this NM2686 master cylinder is built with an aluminum body, plastic reservoir, and included cap for a direct hydraulic service replacement.

Key Features

• Brake master cylinder for brake hydraulic repair and replacement
• Standard replacement grade for select GM rear-wheel-drive platforms
• Aluminum master cylinder body with plastic reservoir
• 1.574-inch bore diameter for the listed applications
• Two mounting holes with 0.425-inch mounting hole diameter
• Reservoir and master cylinder cap included
• No brake booster, push rod, gasket, seal, sensor, or pressure switch included
• New condition part number NM2686

Detailed Description

MPA Electrical NM2686 is a brake master cylinder engineered for vehicles that require a front disc brake hydraulic setup. The design uses OE-based testing and specification checks to help restore braking performance and pedal feel after master cylinder wear, internal leakage, or fluid bypass. The aluminum housing and plastic reservoir provide a service replacement configuration that matches the listed GM applications.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application. It is listed for 1994-1996 Cadillac Fleetwood, 1995-1996 Buick Roadmaster, 1995-1996 Cadillac Commercial Chassis, and 1995-1996 Chevrolet Caprice, making NM2686 a focused solution for full-size GM brake hydraulic service.

What It Helps Fix

• Low or sinking brake pedal caused by master cylinder wear
• Internal fluid bypass that reduces hydraulic pressure
• Brake fluid leakage at the master cylinder assembly
• Uneven or inconsistent pedal response during braking
• Loss of braking performance in front disc brake systems

Installation Notes and Tips

Verify bore diameter, mounting hole spacing, and reservoir configuration before installation. Bench bleed the master cylinder before connecting brake lines, then bleed the full brake system after installation to remove trapped air. Inspect the brake booster, lines, and fittings for wear or contamination before reassembly. Confirm vehicle application by year, make, model, and front disc brake configuration for Buick Roadmaster, Cadillac Fleetwood, Cadillac Commercial Chassis, and Chevrolet Caprice service.

Quality Assurance

MPA Electrical tests each unit against OE specifications using controlled processes and an OE sample library to help ensure consistent braking performance out of the box. Part number NM2686 is supplied as a new standard replacement master cylinder for the listed applications.