Wilwood 260-12381 Compact Remote Side Mount Master Cylinder Bore - 7/8

The Wilwood 260-12381 is a Compact Remote Side Mount Master Cylinder engineered for high-performance street, racing, and custom build applications where space is at a premium. Built from a high-strength die-cast aluminum alloy and finished with a durable black E-coat for long-lasting corrosion resistance, this master cylinder delivers full-size output capacity in an ultra-compact package.

Unlike traditional flange-mount designs, the 260-12381 features integral side mounting lugs on 3.00" centers with no conventional mounting flange — significantly reducing the overall footprint and allowing installation in tight, confined locations that would otherwise be inaccessible. The ultra-short 3.37" compact body provides 2.16" of additional clearance between the mounting boss and the fluid outlet.

Key Features:

• 7/8" (0.875") bore with 0.60 in² piston area
• 1.12" piston stroke — meets or exceeds the stroke capacity of most full-size master cylinders
• 0.67 cu. in. fluid volume displacement per stroke
• Integral side mounting lugs on 3.00" centers — no traditional mounting flange required
• 1/8" NPT fluid outlet port positioned at the top radius of the cylinder bore to minimize trapped air during bleeding
• 11/16"-20 internal threads on the fluid inlet for custom remote reservoir configurations
• Compatible with the standard reservoir included in kit; supports direct-mount or remote reservoir setups
• Black E-coated aluminum body for superior corrosion resistance and a clean, durable finish
• Kit includes master cylinder body assembly with reservoir mounting provisions

The Wilwood 260-12381 is the ideal solution for club racers, open-wheel cars, street rods, off-road builds, and any custom application where a conventional master cylinder simply won't fit. Its compact side-mount body design makes it one of the most versatile master cylinders in the Wilwood lineup.