Wilwood 261-13270-BK Tandem Master Cylinder Kit with Proportioning Valve - 1-1/8

The Wilwood 261-13270-BK is a complete tandem master cylinder kit designed for power brake applications using vacuum assist or hydraulic assist systems. This comprehensive kit includes the 1-1/8" bore aluminum tandem master cylinder, combination proportioning valve, mounting bracket, stainless steel fluid tubes, and all necessary mounting hardware for a complete bolt-on installation.

Master Cylinder Features:

• 1-1/8" bore size optimized for power brake systems
• Machined from high-pressure die cast aluminum for superior strength
• Weighs only 3 lbs—75% lighter than cast iron OE master cylinders
• Slotted flange mounting compatible with Chrysler, Corvette, GM, and Ford Mustang bolt patterns
• Black E-coat finish for corrosion resistance and performance appearance
• Dual tandem chamber design for enhanced safety and fluid control

Complete Kit Includes:

• Tandem chamber master cylinder with black E-coat finish
• Combination proportioning valve with mounting bracket
• Precision-bent stainless steel fluid tubes with pre-installed plated steel tube nuts
• Stainless steel button head fasteners for rust-free durability
• All necessary mounting hardware

The combination proportioning valve maintains complete isolation between front and rear fluid circuits while simplifying brake proportioning adjustments on custom brake systems. The black E-coated valve and bracket provide long-lasting durability and a professional performance look. Installation is straightforward with the slotted flange design—simply bolt on, connect fluid lines, bleed the system, and you're ready to go.