the fluid tank goes empty once a week and it leaking down the front of the booster, now is it the booster or the master cylinder?

its leaking from the rear of the master

rear

yes, rear https://www.nopistons.com/forums/pub...1047683561.gif



just replaced mine last weekend. It's super easy to replace, hardest part is bleeding the brakes (for me anyway, just because it's tedious)

There are two bushings at the bottom of the reservour that leak a lot. Its good to replace those, but as a safety measure I got two lager hose clamps and fastened the reservour to the cylinder.

do those bushings come with a new m/c?

yep. yeah bleeding is not much fun