Brake bleeding

[Todd Young <tyoung@wamnet.com>]

Car: '93 90S w/manual trans

With all this talk about brake bleeding, I'm reminded that I really
should do mine. BUT I have one question. From what I've read the
hydraulic clutch bleed has to be the reverse of the brakes, in other
words you force fluid "IN" through the bleeder valve, rather than "OUT"
the bleeder valve. I've read that this applies to early Audis, but
haven't seen mention if it is still true for the later models. I pose
the question, as this concept is entirely new to me and I don't care to
screw up.

If this is true, I believe I should bleed all the brakes first, starting
on the right rear [left hand drive] and making sure the rear
proportioning valve is open. Once I have all the brakes bled so only
clean fluid comes out, I could then run a hose from one of the front
calipers to the clutch slave, open both bleeders, hold in the clutch,
and pump the brakes once to force clean fluid into the clutch slave. If
that is correct, I intend to have someone watch the fluid reservoir, and
as soon as they see dirty fluid from the clutch, yell, and I stop
pumping. I'll pull the dirty fluid out and refill with clean, and repeat
this proceedure until the clutch slave is purged of dirty fluid.

At present I've got a bleeder hose with a one-way valve at the end, I've
used it in the past with excellent results, but only for brakes not
hydraulic clutches. I am contemplating purchase of a MityVac. Would the
MityVac, hooked up in reverse, serve to push the required clean fluid
into the clutch slave?

Any comments/advice should probably be CC'd to the list, as I'm sure
others have had the same thoughts/questions and would appreciate the
knowledge.

--
Todd Young              WAM!NET Inc.
tyoung@wamnet.com       6100 West 110th Street
612-886-5051            Bloomington, MN 55438-2664
800-585-1133 ext.5051   http://www.wamnet.com/