front end going down

if i have no air in my tank the frontend or rearend will go down. what do i have to do keep this from happing? thanks

check valve between valve and tank.

valves run off of back preasure, if your line is empty behind the valve it will dump.

thats what i was thinking but wasn't sure if i had to one on each line. thanks for the fast reply

Like Mike said just put a check valve between tank and valves

or keep plenty of pressure in the tank and not worry about it