my clutch is slipping wen the car get worm

I have replaced the clutch disc pressure plate release bearing and
cleaned the fly wheel and the car drives fine. But after a 30 min
driving wen the car is wormed up the clutch slips and its hard to get
the tranny into first gear Please help im tottaly lost :x

 

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OK, it's a _car_ .

Dates, mileages, age, model, country ?

'Curly'

 

Without any info at all, I do wonder if it has a hydralic actuator, and
old brake fluid absorbs water, which can boil and expand, after about 30
minutes of running, and partially release the clutch, even if no foot is
on the pedal!

Solution for that is to drain, replace, bleed fluid in that small
system. Also check that the free play is adjusted properly, so the
pedal has the half to one inch free play at the pedal.

 

Psychic Wednesday is a few days off. What model and year, how many miles on
the car?

Mike