I've seen the same thing as Pat, but on other vehicles.  Had a similar problem years ago with my Vanagon and a leaking crankshaft seal.  The disk swelled up so much from the oil that it couldn't disengage.  If the disk swells, the PP diaphragm fingers move closer to the flywheel, but the hydraulics will adjust for that, so you end up reaching the maximum travel on the PP before your pedal gets to the floor, and you 'hit the wall'.  And of course, it won't disengage.

Keith Hughes
'86 Westy Tiico (Marvin)
 
 Date:� � Thu, 15 May 2014 22:04:06 -0400
 From:� � Project Pat <psdooley@VERIZON.NET>
 Subject: Re: Can't figure out the clutch
 
 Last time I saw a clutch doing weird things the friction
 material had broken
 down into big chunks and was stuck in the pressure plate.
 
 -----Original Message-----
 From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]
 On Behalf Of
 thewestyman
 Sent: Thursday, May 15, 2014 9:55 PM
 To: vanagon@GERRY.VANAGON.COM
 Subject: Can't figure out the clutch
 
 Hi everyone,
 
 I just can't figure out what can be wrong with the
 clutch.� When I press it,
 it only goes half way and then it's like hitting a wall
 hard.� Seems to work
 until, except it is not disengaging.
 Anyone has an idea?
 Zoltan
 
 ------------------------------
 
 End of vanagon Digest - 14 May 2014 to 15 May 2014
 (#2014-252)
 **************************************************************