The problem is that you need the really expensive ones with a pressure bladder that sperates the air from the fluid, not just pressure in the chamber with the fluid...
Air pressure in the chamber with the fluid just puts air in the fluid which is one of the key things we are trying to avoid...
You could make one of these with a small gerden sprayer, and a spare brake fluid cap, but why... get some milkshakes, and have a party...
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