Wilwood 260-12378 Compact Remote Side Mount Master Cylinder .62 Bore Die Cast Aluminum

The Wilwood 260-12378 is a Compact Remote Side Mount Master Cylinder engineered for high-performance street, racing, and custom applications where space is at a premium. Machined from a high-pressure die-cast premium aluminum alloy, this unit delivers full-size master cylinder output capacity in an ultra-compact package.

The 3.37" ultra-short body provides 2.16" of additional clearance between the mounting boss and the fluid outlet — a critical advantage in tight engine bays and custom pedal box installations. Unlike traditional flange-mount designs, this unit features integral side mounting lugs on a 3.00" center-to-center spacing with no conventional mounting flange, maximizing its ability to fit in confined spaces.

Key Features:

• 0.625" (5/8") bore — delivers precise, controlled hydraulic output for brake or clutch actuation
• 1.12" full piston stroke — meets or exceeds the stroke capacity of most full-size master cylinders
• 1/8" NPT fluid outlet port positioned at the top radius of the cylinder bore to minimize trapped air and improve bleeding performance
• Integral side mounting lugs on 3.00" centers — no traditional flange required for a cleaner, more compact installation
• Enhanced fluid inlet port accepts the included standard reservoir and also features 11/16-20 internal threads for custom or remote reservoir configurations
• Black E-Coat anodized aluminum body provides long-lasting corrosion resistance and a durable finish
• Compatible with both direct-mount and remote reservoir setups for flexible service access

The Wilwood 260-12378 is ideal for club sport racers, open-wheel cars, custom street rods, and any build where a compact, reliable brake or clutch master cylinder is required without sacrificing hydraulic performance.