Subject: [TR] Clutch Master Cylinder?

From: "John & Pat Donnelly" <[email-masked]>
Date: Tue, 31 Mar 2015 18:40:14 -0700

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Symptom - the clutch pedal fades in pressure to where's there is none.
Observing the master cylinder fluid level in the reservoir, after depressing
the pedal it rises as the pedal pressure fades, and almost overflows. When
the pedal is released the fluid level goes back down to it's original
starting level. Dot 4 brake fluid. Has HVDA transmission conversion. Fluid
bled multiple times. Same results.

What's happening to make the fluid level go up? 

Johnnie

'67 TR4A

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nk=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span style=3D'f=
ont-size:10.0pt;font-family:"Arial","sans-serif"'>Symptom - the clutch peda=
l fades in pressure to where's there is none. Observing the master cylinder=
 fluid level in the reservoir, after depressing the pedal it rises as the p=
edal pressure fades, and almost overflows. When the pedal is released the f=
luid level goes back down to it's original starting level. Dot 4 brake flui=
d. Has HVDA transmission conversion. Fluid bled multiple times. Same result=
s.<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:10.0p=
t;font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p><p class=3D=
MsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'=
>What's happening to make the fluid level go up? <o:p></o:p></span></p><p c=
lass=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","sans-=
serif"'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=3D'fon=
t-size:10.0pt;font-family:"Arial","sans-serif"'>Johnnie<o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial",=
"sans-serif"'>'67 TR4A<o:p></o:p></span></p></div>
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From: Geo Hahn <[email-masked]>
Date: Tue, 31 Mar 2015 20:04:43 -0700

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Johnnie -

I would suspect that the seal at the end of the piston assembly is leaking
- a common failure that results in ineffective clutch but no leaking
fluid.  That seal is what is supposed to keep fluid (fluif) from being
pushed back into the reservoir (and thus causes pressure to move the
slave).  Item 28 in this drawing:

http://www.revingtontr.com/CatalogueImages/TR4/W.jpg

The seal (like a little cap) is a part of the usual rebuild kit.

Geo

On Tue, Mar 31, 2015 at 6:40 PM, John & Pat Donnelly <[email-masked]>
wrote:

> Observing the master cylinder fluid level in the reservoir, after
> depressing the pedal it rises as the pedal pressure fades, and almost
> overflows. When the pedal is released the fluid level goes back down to
> it's original starting level. Dot 4 brake fluid. Has HVDA transmission
> conversion. Fluid bled multiple times. Same results.
>
>
>
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<div dir=3D"ltr"><div>Johnnie -</div><div><br></div><div>I would suspect th=
at the seal at the end of the piston assembly is leaking - a common failure=
 that results in ineffective clutch but no leaking fluid.=C2=A0 That seal i=
s what is supposed to keep fluid (fluif) from being pushed back into the re=
servoir (and thus causes pressure to move the slave).=C2=A0 Item 28 in this=
 drawing:</div><div><br></div><div><a href=3D"http://www.revingtontr.com/Ca=
talogueImages/TR4/W.jpg">http://www.revingtontr.com/CatalogueImages/TR4/W.j=
pg</a></div><div><br></div><div>The seal (like a little cap)=C2=A0is a part=
 of the usual rebuild kit.</div><div><br></div><div>Geo</div></div><div cla=
ss=3D"gmail_extra"><br><div class=3D"gmail_quote">On Tue, Mar 31, 2015 at 6=
:40 PM, John &amp; Pat Donnelly <span dir=3D"ltr">&lt;<a href=3D"mailto:pdo=
[email-masked]" target=3D"_blank">[email-masked]</a>&gt;</span> wrot=
e:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l=
eft:1px #ccc solid;padding-left:1ex"><div lang=3D"EN-US" vlink=3D"purple" l=
ink=3D"blue"><div><p class=3D"MsoNormal"><span style=3D"font-family:&quot;A=
rial&quot;,&quot;sans-serif&quot;;font-size:10pt">Symptom - the clutch peda=
l fades in pressure to where&#39;s there is none. Observing the master cyli=
nder fluid level in the reservoir, after depressing the pedal it rises as t=
he pedal pressure fades, and almost overflows. When the pedal is released t=
he fluid level goes back down to it&#39;s original starting level. Dot 4 br=
ake fluid. Has HVDA transmission conversion. Fluid bled multiple times. Sam=
e results.<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"fo=
nt-family:&quot;Arial&quot;,&quot;sans-serif&quot;;font-size:10pt"><u></u>=
=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-family:&=
quot;Arial&quot;,&quot;sans-serif&quot;;font-size:10pt">What&#39;s happenin=
g to make the fluid level go up? <u></u><u></u></span></p><p class=3D"MsoNo=
rmal"><span style=3D"font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;f=
ont-size:10pt"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span =
style=3D"font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;font-size:10p=
t">Johnnie<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"fo=
nt-family:&quot;Arial&quot;,&quot;sans-serif&quot;;font-size:10pt">&#39;67 =
TR4A<u></u><u></u></span></p></div>
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From: "Randall" <[email-masked]>
Date: Tue, 31 Mar 2015 20:50:58 -0700

> I would suspect that the seal at the end of the piston 
> assembly is leaking - a common failure that results in 
> ineffective clutch but no leaking fluid.  That seal is what 
> is supposed to keep fluid (fluif) from being pushed back into 
> the reservoir (and thus causes pressure to move the slave).  
> Item 28 in this drawing:
> 

I agree entirely.  If you do choose to rebuild, also check the flat area inside the MC around the exit hole (where the seal seats).
Corrosion or damage in that area can cause the seal to not do it's job.

-- Randall