Car want stop when i press brake. What do i do?? whats wrong??

Park that Merc. Mistake until the brakes are fixed!!

Drive slow and put old tires around it for protection. Then when it wants to stop , put the parking brake on , shut it off , put it in park , open hood and see how empty the master cylinder reservoir is. Let us no that and we cant help

start at a good mech and get an diag and est