my car set for a few months last year after i injured my hand, by the time i was able to get back to working on it the 44 year old brakes needed attention. i rebuilt the wheel cylinders on all four wheels, and new brake shoes up front to replace the asbestos shoes that was getting thin. i had to do a rebuild on the master cylinder also. i purchased a rebuilt master took the guts out of it and put them in my original master cylinder. i have bleed the brakes twice with the same results . i am standing on the brake pedal to get it to stop. i am wondering if the parts out of the parts house master could be the problem? getting frustrated needless to say.