If we're talking about the hose between the reservoir and the master cylinder you could perhaps look at replacing the clips with jubilee type clamps as the ones you have don't look like they would put enough pressure on the join to stop leaks, though it's difficult to tell from the photo. Have you tasted the 'sweat'? From experience (don't ask) brake fluid tastes like a much more concentrated version of ear wax, if you don't know ear wax tastes like (I was a curious child) then you should have some on hand or know of someone who could oblige.
