clutch slippage on 1991 Hyundai Excel

I couldn't get the clutch pedal to ;the floor, so I drained off some fluid. The pedal went to the floor fine, it shifted fine, so I took it out for a test drive and noticed the clutch was slipping. WHY and is there a way to adjust the clutch??

Asked by for the 1991 Hyundai Excel
I'm thinking that the clutch is worn out and getting set to fail completely. You should never have to drain fluid from the clutch release system so I'm thinking that the clutch pressure plate release levers are out too far because there's nothing left of the clutch friction material.