It would sound like air to me, too, but that it works "90% of the time"
which would indicate to me that one of the seals is not sealing properly.
It's been a while, but I had a similar experience, and discovered that
if I hit the pedal quick and hard, the clutch action was good; if not
fast or hard enough, the pedal was soft.
My guess is that a seal is old and not always flaring out to the MC bore
when the pedal is pressed.
Donald.
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On 2019-10-09 8:03 p.m., PJ McGarvey via Shop-talk wrote:
> Sounds indicative of air in the lines, since the first pump is
> weak/soft, but as you pump it a few more times you get more pressure.
> Check for loose connections and then bleed a whole bottle of fluid.
>
> PJ
>
> ------------------------------------------------------------------------
> *From:* Shop-talk <shop-talk-bounces@autox.team.net> on behalf of Tom
> Shirley Sr. via Shop-talk <shop-talk@autox.team.net>
> *Sent:* Wednesday, October 9, 2019 7:46 PM
> *Cc:* Shop-talk <shop-talk@autox.team.net>
> *Subject:* Re: [Shop-talk] Weird clutch petal
> Air in the lines?
>
> On Wed, Oct 9, 2019, 6:38 PM Robert Nogueirao via Shop-talk
>
>
> I have a hydraulic clutch, Girling 5/8? master and a internal slave
> that fits over the input shaft. Both are new. Problem is I have a
> really good feeling petal, no leaks and good operation 90% of the
> time but occasionally when you depress the clutch to change gears
> the petal feels soft and will not fully release the clutch. Letting
> the petal out and again depressing it and the feel and release are
> again normal. Reservoir shows no lost of fluid.
> Since the slave is mounted on the input shaft and operates directly
> on the throw out bearing there is no linkage to cause the problem.
> Any suggestions as to what could be causing this problem?
> Bob Nogueira
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