[urq] sticky clutch pedal

[William Elliott]

Dave and I agree in results but not in details...


<<> If a clutch system is sucking in air, it's the master cylinder.>>

Agreed.

<<  Slave > cylinders on audi's don't leak, they sieze. >>

Mine was leaking by internally. Was not seized.

<<It's the master cylinders that  > leak.  When a master cylinder starts
leaking it's because the slave is siezing, > and the pressure buildup is
blowing the seals on the master.>>

My master was slightly leaking externally... so I assume it had internal
leakage as well. Maybe caused by pressure buildup... more likely caused
by being 16 years old...
> 
> Thus, the problems in hydraulic clutches are caused by the slave, not the> master. The master is the 'weakest' link in the system, and thus is the first  > noticeable thing to go.

Interestingly, the local German wrench says he rarely replaced an Audi
master... usually low pedal is caused by the slave leaking internally.
> 
<<> If you are replacing the slave OR the master, ALWAYS replace the
other one at > the same time.>>

ABSOLUTELY agree in theory... and in any car, not just Audi. 

Bill Elliott
Lake Barrington, IL