Doesn't sound like an air problem.
Could it be a be a crushed or kinked pipe underneath the car?
Will the slave move if you disconnect the slave from the clutch lever?
Do the master and slave cylinders work smoothly when not connected to the car?
You should be able to move the piston by hand(be careful not to squirt fluid in your eye or on your car)
If these all seem to work separately I suggest
you get a short pipe made up (about a foot) that you can use to connect the master to the slave. Then see if you can operate the master by hand to move the slave.
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