MPA Electrical NM1863 Brake Master Cylinder

Brake Master Cylinder for GM Disc Brake Applications

Restore consistent brake pedal response with this new brake master cylinder from MPA Electrical. Part number NM1863 is a standard replacement unit for a wide range of Chevrolet, GMC, Buick, Cadillac, Oldsmobile, and Pontiac vehicles equipped with front disc brakes.

MPA Electrical’s New with front disc brakes product line focuses on direct-fit hydraulic brake components for older GM platforms, including trucks, SUVs, and full-size cars. This NM1863 master cylinder is built as a cast iron, integral-reservoir replacement with a 1.181-inch bore and DOT 3 fluid compatibility.

• Brand: MPA Electrical
• Part number: NM1863
• Brake master cylinder for front disc brake applications
• Cast iron construction with integral reservoir
• 1.181-inch master cylinder bore diameter
• Reservoir included with cap included
• Standard replacement grade
• New condition
• Mounting hole quantity: 2
• Fluid type: DOT 3

Detailed Product Overview

This brake master cylinder is engineered to restore hydraulic pressure in vehicles that use front disc brakes, including Chevrolet C10, GMC C1500, Chevrolet Blazer, GMC Jimmy, Chevrolet Caprice, and related GM platforms. It is a direct replacement for applications that require an integral reservoir design and a 1.181-inch bore, helping maintain proper pedal feel and brake system response. This part cross-references OE numbers 14047683 and 18030402 for the same application.

What It Helps Fix

• Low or inconsistent brake pedal pressure
• Internal master cylinder wear that affects hydraulic output
• Brake fluid leakage at the master cylinder body
• Soft or sinking pedal feel in front disc brake systems
• Reduced braking performance on aging GM brake hydraulics

Installation Notes and Fitment

Compatible With 1981-1986 Chevrolet C10, 1982-1986 Chevrolet C10 Suburban, 1982-1986 Chevrolet C20, 1982-1986 Chevrolet C20 Suburban, 1982-1986 Chevrolet K10, 1982-1986 Chevrolet K10 Suburban, 1982-1986 Chevrolet K20 Suburban, 1982-1986 Chevrolet K5 Blazer, 1981-1986 GMC C1500, 1982-1986 GMC C1500 Suburban, 1982-1986 GMC C2500, 1982-1986 GMC C2500 Suburban, 1982-1986 GMC K1500, 1982-1986 GMC K1500 Suburban, and 1982-1986 GMC K2500 Suburban, all with front disc brakes.

Additional fitment includes 1983-1995 Chevrolet G20, 1983-1995 GMC G2500, 1987-1991 Chevrolet Blazer, 1989-1991 Chevrolet R1500 Suburban, 1989-1991 Chevrolet R2500 Suburban, 1989-1991 Chevrolet V1500 Suburban, 1989-1991 Chevrolet V2500 Suburban, 1982-1991 GMC Jimmy, 1987-1991 GMC R1500 Suburban, 1987-1991 GMC R2500 Suburban, 1987-1991 GMC V1500 Suburban, and 1987-1991 GMC V2500 Suburban, all with front disc brakes.

Before installation, verify bore size, mounting hole spacing, and brake line connection style against the original unit. Bench bleeding the master cylinder before installation helps remove trapped air and supports proper pedal recovery after the system is filled with DOT 3 brake fluid.

Quality Assurance

MPA Electrical tests each unit against OE specifications using proprietary processes and strict protocols based on an extensive OE sample library. That validation process is used to help ensure consistent braking performance right out of the box.