Brake (and now clutch) problem revisited

[amz at eskimo.com]

I'm barely CLUTCHing onto sanity...
about to have a nervous BRAKEdown!

Car: 1988 5ksq
Misc. details: recently replaced front left CV's, clutch & clutch master

A short while ago, just after getting a new clutch master put in, the brakes
started to lose pedal resistance suddenly (i.e. pedal to floor with just a
"hiss").  Couldn't find a drive time, heat or other correlation.  Brakes
would usually just magically come back.  No apparent loss of fluids in
reservoirs.

Then, started to lose "springback" of clutch pedal.  Bentley says possible
air in lines.  Shop pressure bled lines -- both brakes and clutch just
ducky!!  For a day.

Same problems returning... with a new twist.  Did a bunch of local driving
yesterday and started to lose a little brake and a little clutch pedal
return toward middle and end of day.  This morning... Clutch almost to
floor.  OK to start car, but unable to (attempt to) engage gears without
grinding (to drive it to the shop).  Brake pedal, OTOH, is ALL the way to
the top.

A while back, I tried the "turn off engine and pump brakes" test and could
go forever without any change in brake pedal feel.

Could this really just be the brake master?  There is a new clutch master --
possible culprit somehow?

Bad brake booster wouldn't kill clutch, would it?

Is there any way that the ABS sensors could contribute?  Repair shop didn't
have the ABS testing gear that the Bentley mentions.  Is that really needed?

Thanks in advance to anyone/everyone that can assist.

- Andrejs

P.S.  Please cc: my personal e-mail in addition to the Q List.