Do your homework please. If pressure cannot be restored, the QRH directs that all the associated system pumps are selected off.
I did, when there is a leak (loss of quantity indicated) then , there is no chance for pressure !!! and even when the pumps are off, when there is a leak, it leaks everywhere inside the aircraft.... and at minus something for hours hydraulics can freeze or damage other systems when the fluid is not contained in a tank/pipes