65Vert

Hi, I have a problem with my 1970 Stangs' Hydrovac. It seems to to be sucking up all the fluid so it appears faulty. Now i intend to replace it and would like to know what would be recommended. Would prefer not to use an old part since brakes are very, very important. Are there any aftermarket recommendations? dual reservoir? More looking at a car i can drive with confidence at this stage. It is for a 1970 Mach 1 by the way. thanks