[s-cars] Bleeding Clutch Hydraulic System

[Brent Henry]

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I have just replaced both the Master Clutch Cylinder and the Slave Clutch C=
ylinder on my '92 S4.  I initially attempted to "gravity bleed" the system =
by filling the brake fluid reservoir and by cracking open the bleeder valve=
 on the slave cylinder and allowing gravity to pull the fluid through the s=
ystem (draining through a hose into a container).

This seemed to be working... after about a half an hour some fluid started =
dripping through the bleeder valve!  I have heard (somewhere on this list) =
that this method takes a fair bit of time... so, I continued with this meth=
od for over 15 hours (overnight), filling the brake fluid reservoir every f=
ew of hours to ensure that I don't introduce any new air bubbles into the s=
ystem!

This morning I closed the bleeder valve up tight and checked for pressure i=
n the clutch pedal... there was no pressure!  It went right to the floor?  =
So, I began pumping the clutch pedal by hand (as to facilitate lifting the =
pedal up to normal rest position)... after about 300 pumps, I started to de=
tect some pressure in the bottom inch or two of the pedal movement.  Howeve=
r, at 800 pumps there is no significant increase in pressure at the pedal?

I remember doing this procedure in my old '88 5KTQW, it only took about 100=
0 pumps to get the system fully pressurized (however, I only changed the Ma=
ster Cylinder)... by changing both master and slave cylinders, does this me=
an that it requires twice as many pumps?

Can someone who has BTDT provide some feedback on how best to bleed this sy=
stem.
Thanks,
Brent.
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