Again, I have no idea what you're talking about. What brakes do you have exactly? There are only a handful of manufacturers (Shimano, SRAM, Tektro/TRP, Hope, maybe a couple others). And no, you shouldn't be losing anything. Bleeding is easy: you take connect a hose to the caliper, and a cup to the level/master cylinder, and pump some new fluid in there with a syringe. (In practice, it's somewhat fiddly and can be a little messy if you're not careful.) There's no parts to lose, except the screw that seals the master cylinder, and maybe the bleed port screw on the caliper if it doesn't use a nipple.