[s-cars] Bleeding Clutch Hydraulic System

[Igor Kessel]

Brent Henry wrote:
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> I have just replaced both the Master Clutch Cylinder and the Slave Clutch Cylinder 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 system (draining through a hose into a container).
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> 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 method for over 15 hours (overnight), filling the brake fluid reservoir every few of hours to ensure that I don't introduce any new air bubbles into the system!
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> This morning I closed the bleeder valve up tight and checked for pressure in 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 detect some pressure in the bottom inch or two of the pedal movement.  However, at 800 pumps there is no significant increase in pressure at the pedal?
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> I remember doing this procedure in my old '88 5KTQW, it only took about 1000 pumps to get the system fully pressurized (however, I only changed the Master Cylinder)... by changing both master and slave cylinders, does this mean that it requires twice as many pumps?
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> Can someone who has BTDT provide some feedback on how best to bleed this system.
> Thanks,
> Brent.
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Brent,
clutch bleeding requires a pressure bleder. You can get one for ca. $50.

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Igor Kessel
two turbo quattros