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Message: <blockquote data-quote="jerry" data-source="post: 64804" data-attributes="member: 931"><p>On a brake system almost all the fluid never leaves the line , just enough to push the wheel cyl and when not braking that little bit backs up into the master cyl. On your hyd cyl its all fresh oil pumped in to extend and when you retract it that oil goes back to the reservoir as new oil is coming in the other side of the piston. So there is a flow rather than static fluid like a brake. Like Tazza said the outgoing oil carries the air along with it to the tank.</p></blockquote><p></p>