you can use type f transmission fluid found in any auto parts store
Hydraulic oil.
a piston with an intake/outake port and a return sping is one way to assemble it
NO
Should use jack oil, but you can use transmission fluid if you have to.10W motor oil works also.
How to Bleed Hayes Disc Hydraulic Brake System
How to Bleed a Hayes Nine/Sole Disc Brake
How to Bleed a Shimano Brake System
Problems of Amniotic Fluid During the Pregnancy