[Shop-talk] Weird clutch petal

[Pat Horne]

You should be able to find a set of seals to try. Lots cheaper than a replacement master. 

In the past I found this kind of leak by having someone watching the fluid surface in the reservoir while I pressed the pedal down. On my master there was a rise of the fluid where the jet of fluid came out of the reservoir to cylinder hole, causing a “lump” in the fluid surface, indicating a bad seal. 

Peace,
Pat

Pat Horne 
We support Habitat for Humanity


> On Oct 11, 2019, at 10:46 PM, Robert Nogueirao via Shop-talk <shop-talk at autox.team.net> wrote:
> 

Okay bleed the lines no solution, chance of air in the lines is remote, the slave is higher than the master, the run between them is only a foot or so and the line turns down for only a couple of inches between them. Additionally the bleederis at the highest point of the slave.  
The lines are new as is the slave and master.   
I did disassemble the master to check it out and it appears to be a Girling knockoff. The piston and reservoir shut off valve feel cheaply made. I’m thinking that the reservoir shutoff may be leaking a bit until pressure is built up thus forcing fluid into the reservoir rather than to the slave.  Only way to check is order a new Girling master from Pegasus, basically a $125 gamble.
Right now Donald and Pat are in the problem solving playoffs.   
Will advise if the gamble pays off
Thanks for the suggestions. 

Bob Nogueira 

B

>> On Oct 9, 2019, at 7:18 PM, Donald H Locker via Shop-talk <shop-talk at autox.team.net> wrote:
>> 
> 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 at autox.team.net> on behalf of Tom Shirley Sr. via Shop-talk <shop-talk at autox.team.net>
>> *Sent:* Wednesday, October 9, 2019 7:46 PM
>> *Cc:* Shop-talk <shop-talk at 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 <shop-talk at autox.team.net <mailto:shop-talk at autox.team.net>> wrote:
>>    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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