Triple valve malfunction (triple valve defect) causes an effect on braking distance, braking timernand braking force. [10]. From those defects leakage through triple valve piston, sliding valve andrngraduating valve are taken for analyzing the effects of malfunctioning of locomotive triple valvernon braking time. The defects during leakages through triple valve piston head, triple valve pistonrnrod, sliding valve and graduating valve causes air pressure to decreases lower than air pressurernduring normal operation of triple valve. Maximum and minimum pressure losses during leakagesrnthrough triple valve piston head, triple valve piston rod, sliding valve and graduating valve arerntaken for Analyzing braking distance, braking time and braking time. The mathematical modelingrnduring pressure losses through those triple valve components are used for modeling blockrndiagram by Simulink matlab during leakages through triple valve piston head, triple valve pistonrnrod, sliding valve and graduating valve. The simulation is modeled by using Simulink matlab.rnThe simulation result shows triple valve with maximum and minimum % of leakages increasesrnbraking time and braking distances, but decreases braking forces