Wilwood 260-18184 Aluminum Tandem Master Cylinder 15/16" Bore Die Cast Dual Outlet with Pushrod

The Wilwood 260-18184 is a 15/16" bore aluminum tandem master cylinder precision-machined from a high-pressure die casting of premium alloy. Designed for manual braking applications in custom performance, racing, and special-purpose off-road builds, this master cylinder delivers reliable, balanced hydraulic output across a dual-circuit brake system.

The tandem design separates the front and rear brake circuits into independent primary and secondary chambers, providing a critical safety advantage: if one circuit fails, the other circuit can still build pressure to allow emergency braking. A 1.10" piston stroke and 2:1 volume output ratio between the primary (A) and secondary (B) chambers ensures optimal fluid delivery and balanced braking performance.

Key Features:

• 15/16" bore diameter — optimized for manual brake applications
• Dual outlet ports (1/2-20 UNF) on both sides of the bore for right- or left-hand plumbing flexibility
• High-pressure die cast aluminum body — weighs approximately 3 lbs, a significant reduction versus cast iron OEM units
• Slotted mounting flange accommodates mount centers from 3.22" to 3.40", fitting most domestic cars and trucks from the mid-1960s to present
• Side-hole mounts on 6.40" centers for additional mounting options
• 1.10" piston stroke with 2:1 volume ratio (primary to secondary)
• Primary reservoir capacity: 13.93 cubic inches; Secondary reservoir capacity: 8.43 cubic inches
• Pressure output ratio: 50/50 (A/B)
• Pushrod included — standard finish (bare aluminum)
• Also available in Chrome P-Coat (260-18184-P) and Black E-Coat (260-18184-BK)

This master cylinder is intended for use in custom brake systems on performance, racing, and special-purpose built off-road vehicles. It is not designed as a direct OEM replacement. Installer is responsible for verifying suitability for the specific application and ensuring full pushrod travel of 1.10" before the pedal contacts the floorboard.