When braking have to step on the brake more than once and I already change the master cilinder
did you bench bleed the master cylinder before putting it on car. if not there is air in braking system. you can try this, have someone pump the brakes and hold them. when loosening line the brakes will go to floor, tell person to hold them till line is retightened. loosen one brake line to get trapped air out. close line and have person pump then hold the brakes and repeat above till the brakes go to floor. if this does not get all air out! then bleed at wheels. ( how to bench bleed master cylinder ).----- put in vise, fill resovoir full of brake fluid. use a dowel or similar to pump master cylinder,pump untill fluid is free of air bubbles shoots out that has no more air in it. keep fluid in it or you will get more air in it. when putting on car have fluid in it. as long as you do not loose fluid from lines, you should be ok!! have a good holiday !! if all else fails. be sure there is no leaks at the wheels or brake lines. usually if a wheel cylinder is leaking. you will see this on inside of wheels on backing plate. be sure to fill fluid when done.
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