Wilwood 260-15521-P Compact Tandem Master Cylinder Bore Classic Mustang - 15/16

The Wilwood 260-15521-P Compact Tandem Master Cylinder is engineered specifically for 1964-1972 Ford Mustangs with manual brake applications. This high-performance brake master cylinder features a 15/16" bore diameter and comes complete with the correct-style pushrod and eyelet for direct bolt-on installation to early Mustang factory brake pedals.

Key Features:

• 15/16" bore diameter optimized for manual brake systems
• Ball burnished finish for corrosion resistance and clean appearance
• Designed for factory mount flanges measuring 3.22" to 3.40" (matches 1964-1972 manual master cylinder mounts)
• Dual fluid outlet ports on both sides of the bore for flexible installation options
• 1.10" stroke length with 2:1 volume ratio between primary and secondary chambers
• Machined from high-pressure die castings for strength and lightweight construction
• Weighs only 3 lbs—75% lighter than traditional cast iron OE master cylinders
• Includes correct pushrod for 1964-1972 factory brake pedal applications

This compact tandem master cylinder delivers reliable, consistent brake performance while significantly reducing unsprung weight. The dual-chamber design provides added safety with independent front and rear brake circuits. For complete brake system optimization, Wilwood offers combination proportioning valve kits with brackets and stainless steel lines designed specifically for this master cylinder (PN 260-14248 for left-hand outlets or PN 260-15667 for right-hand outlets, sold separately).