Power brake conversion kit for the 1967, 1968, 1969, and 1970 manual transmission Ford Mustang with drum brakes.
Uses a Bendix style power brake booster with increased sensitivity, large capacity dual chamber master cylinder, a mounting bracket that allows direct bolt in while keeping the original brake pedal assembly, and a preset adjustable pushrod.

Requires a minimum 15 pounds of engine vacuum pressure at idle for maximum stopping power.
Some high performance/high lift camshafts may not create enough vacuum. 
Stock engine vacuum pressure is 18 pounds.