MPA Electrical NM1505 Brake Master Cylinder

Brake Master Cylinder for Classic GM Applications

Restore firm, consistent brake pedal feel with this MPA Electrical brake master cylinder, part number NM1505. Built as a standard replacement with a 1-inch bore, cast iron body, and integral reservoir, it is made for classic vehicles with front drum brakes and manual brake setups where specified.

Compatible With 1967-1974 Chevrolet Nova, 1967-1972 Chevrolet El Camino, 1967-1970 Chevrolet Bel Air, 1969-1970 Chevrolet Blazer, 1967-1970 Chevrolet C10 Suburban, 1968-1970 Chevrolet C20 Suburban, 1967-1970 Chevrolet K10 Suburban, 1968-1970 Chevrolet K20 Suburban, 1967-1969 Chevrolet Camaro, 1967-1969 Chevrolet Caprice, 1967-1969 Chevrolet Impala, 1967 Chevrolet Malibu, 1967 Chevrolet Firebird, 1967-1972 GMC G25/G2500 Van, 1967-1971 GMC G15/G1500 Van, 1970 GMC Jimmy, and 1973-1974 Oldsmobile Omega with front drum brakes as listed.

Key Features

• Part number NM1505 brake master cylinder
• 1-inch master cylinder bore diameter
• Cast iron master cylinder construction
• Integral reservoir design with reservoir included
• Master cylinder cap included
• Standard replacement grade
• Uses DOT 3 brake fluid
• Two mounting holes with 0.429-inch mounting hole diameter
• New condition

Detailed Description

MPA Electrical NM1505 is a brake master cylinder engineered for vehicles that use front drum brakes, including select Chevrolet, GMC, Pontiac, and Oldsmobile applications from the late 1960s and early 1970s. The cast iron housing and 1-inch bore support hydraulic brake system restoration, while the integral reservoir and included cap provide the core components needed for a direct master cylinder replacement. This part cross-references OE-style numbers 5458523 and 5472651 for the same application.

What It Helps Address

• Low or inconsistent brake pedal response
• Internal master cylinder wear that affects hydraulic pressure
• Brake fluid leakage at the master cylinder body
• Brake system restoration on classic front drum brake vehicles
• Loss of braking performance from an aging original unit

Installation Notes and Tips

Verify front drum brake configuration and manual brake application before ordering. This master cylinder does not include a brake booster, push rod, mounting hardware, dust boot, gasket or seal, sensor, or brake pressure switch. Use DOT 3 brake fluid and bench bleed the unit before installation to help reduce trapped air in the hydraulic system. Confirm mounting hole spacing and bore size against the original part number NM1505 application.

Quality Assurance

MPA Electrical tests each brake master cylinder against OE specifications using controlled procedures and an OE sample library to support consistent braking performance out of the box. The brand’s process focuses on dimensional and functional consistency for standard replacement use.