Grabby Heavy clutch pedal - only with engine on

["Livio Passera" <livio@domain.elided>]

Fellow Digesters,

The patient is a 73 Berlina, with hanging pedals.

The symptoms are as follows:

With the engine off the clutch pedal feels great.
Smooth operation,  consistent pedal force throughout
its entire motion of travel.  Start the engine, and within
a minute or two (perhaps once the engine bay heats
up?) the pedal becomes heavy, the travel is not smooth
but creaky and "grabby" making smooth pedal releases
difficult and parking in tight spot, very interesting.
Turn the engine off, and pedal travel immediately returns
to normal.  The car is new to me, but the P.O. says
the master cylinder, clutch, throw-out bearing and
pressure plate were all recently changed.  The clutch
is a Sachs so presumably of good quality.

An Archive search has proven fruitless, any ideas
as always, would be greatly appreciated!

Livio Passera
Toronto, Canada
77 Spider
73 Berlina
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