Mine are just a real big cylinder that is also the 'tank". It has a pipe plug about half-way up on side that I remove and fill till it runs out, just like rears and trannies. No leaking and caked on crud? Must be "empty" :rolleyes:

If you have a tank and pump seperate and lines to cylinder, maybe you have a little newer type than what most of mine are. Isn't there a clear tube/line on side of tank as a gauge?