PS fluid leakingh from the joint between the ps tank and the pump input is not uncommon, the cure, is amazing though, a bit of plastic and some very rough emery cloth, or sandpaper.
Take of inlet pipe between pump and tank, plug the hole 100% with either a wodden dowel, or plastic dowel, roughen the exterior of the inlet stub on the pump where the pipe goes, this will effect a 100% cure.
Front brakes imbalanced could be due to several things, have a look and see if ther eis any air in the lines, if so bleed till clear, or if old fluid bleed clean through, same with rear, then check that neither piston is sticking, if it is get a helper and pump the piston out further than it would normally go, spray with diesel, or parrafin, clean with old toothbrush, if discs look rusty consider whether you need new ones, or whether a roasting of the brakes will do the job, most stick due to easy brakers.
For the rear again inspect, sometimes if drum a manual adjust of the auto adjusters is needed, but check the cable is not sticking, check also the wheel cylinders have not leaked fluid onto the shoes, if so replace both sides shoes and wheel cylinders.
If disc make sure the e brake cable is free again and that the caliper e brake mechanism has not seized, they do, again a bleed will not go amiss.
tabetha