Mopar Master Cylinder 1-1/16 Bore

The Mopar Master Cylinder 1-1/16 Bore (part number DBMC10) is an original-equipment replacement brake component engineered for Mopar passenger vehicles spanning 1971 through 1978. This master cylinder features a 1.063-inch bore diameter and dual integral reservoir design, maintaining the authentic specifications of vehicles from Chrysler's classic performance and daily-driver lineup. Built from iron construction with a natural finish, this master cylinder delivers the precise hydraulic pressure modulation required for reliable brake system operation across vintage Mopar platforms.

The 1.063-inch bore size is matched to the brake system architecture of first-generation Mopar E-bodies and mid-generation B-bodies, ensuring proper pedal feel and brake balance without modification to the existing hydraulic circuit. The dual integral reservoir design consolidates the primary and secondary fluid chambers into a single compact housing, simplifying installation and minimizing the risk of cross-contamination between brake circuits. This design proved effective across millions of factory applications and remains the standard for authentic restoration work. The iron construction provides thermal stability under sustained braking loads and resists corrosion when maintained with DOT 3 or DOT 4 brake fluid.

This master cylinder is purpose-built for owners performing brake system restoration, replacement, or maintenance on 1971–1978 Mopar passenger cars. Whether addressing a failed original unit, rebuilding a complete brake system, or restoring a classic Dodge, Plymouth, or Chrysler platform, this component replicates OEM specifications and ensures compatibility with factory brake hardware, lines, and proportioning valves. The kit format includes all necessary mounting hardware and seals for direct bolt-in installation, eliminating guesswork during assembly.

Original-style master cylinders like this remain the preferred choice for enthusiasts prioritizing authenticity and system compatibility over modern aftermarket alternatives. The specifications are period-correct, the bore diameter is verified against factory drawings, and the construction approach reflects the engineering decisions that made these brake systems reliable in their original application. Proper installation requires flaring brake lines and bench-bleeding the cylinder before vehicle operation to eliminate air from the hydraulic system.