Clutch Questions
To test the master disconnect the line from the slave. Try and depress the master. If you can push it down with normal pressure either the master has a bad seal or there's air in it.
Your description of the problem is a little difficult to understand. I'm assuming you've got your foot all the way off the clutch by 2000 rpm and when you hit the gas the RPMs rise but you don't go any faster? That would be a slipping disc and would be unrelated to the hydraulic system. That's a worn disc/pp/flywheel issue. A slipping clutch will usually exhibit itself at low speed low rpm full throttle in 6th accelerating up to around 55 or 65 mph but you're saying you don't see this happening?

