Truck Repair: chevy clutch master cylinder, clutch master cylinder, clutch pedal

Question
its a 92 chevy k2500 4x4 with a manual the master cylinder keeps cracking doesing take long either maybe aday maybe longer i have put 5 in they keep replacing them free.  its got a new clutch and tranny.  slave cylinder throughout bearing and the plastic houseing cracks.  The clutch engages and disengages at the very bottom of the pedal.  Any ideas.

Answer
Hello Jason,
I have a fleet, and have had many trucks with that system, and have never had the master cyl break.
My first question is, was the orriginal broken, or did you just replace it for a complete new system?
If so, is there any chance it is the wrong one, and they keep replacing it with the wrong one?
And is it mounting correctly?
This problem puzzles me. Any chance the push rod is not going in straight? Possibly mounted on the wrong side of the clutch pedal lever?

Wish I had an answer for you.

Van