Thanks David. I don't know exactly what it is about Alpine clutches, but know
some people have resorted to raising the front end of the car and leaving the
slave bleeder slightly open all night long (and draining into a jar with fluid
in it) in order to get that last bit of air out. (I tried that once and it
didn't seem to do anything.) I have also used my vacuum bleeder and the good
old helper method and while everything works, there is no question in my mind
that there is still a bit of air in there. I can feel the difference after I
pump the system a couple of times. It is subtle, but definitely there.
Date: Tue, 30 Mar 2010 19:54:29 -0400
Subject: Re: [Shop-talk] Brake system bleeders
From: dmscheidt@gmail.com
To: jandkstone99@msn.com
CC: shop-talk@autox.team.net
On Tue, Mar 30, 2010 at 6:41 PM, Jim Stone <jandkstone99@msn.com> wrote:
I know vacuum bleeders don't work well on hydraulic clutches; how about
pressure bleeders? The design of the Alpine hydraulic system makes it almost
impossible to get the last bit of air out of the slave cylinder and I have
often thought that a pressure bleeder might do the trick.
I've bled the clutches on hundreds of cars, in lots of makes, with a vacuum
bleeder, and never had a problem. I confess to never having worked on alpine
clutch (but I'm sure I've bleed clutches with the same slave cylinder.).
Pressure bleeders make brute force solutions easier (if you run a couple times
the volume of a system through, you can get all the air out.), but vacuum
should work. (One source of problems with vacuum bleeders is air leakage
around the threds of the bleeder screw. Pressure bleeders fill that space
with pressurized fluid, so they don't usually get air sucked in that way. Some
cylinders are more prone ot he problem than others.)
One problem with bleeding British car hydraulic systems is the swept volume of
master cylinders is very low compared to the volume of the wheel cylinders,
calipers and slaves. American and Japanese systems tend to have a much higher
volume of fluid moved per complete stroke of the pedal.
--
David Scheidt
dmscheidt@gmail.com
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