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<DIV><FONT size=2>Firstly the tilt in the later clutch master - that was to
clear the larger brake reservoir cap on North American models when they gained
the dual circuit system, but was fitted to all MGBs. AFAIK the tilt
rotates the master cylinder about the centre-line of the bore, so everything
should remain in line. Whilst the pipe could be moved to mate up with the
master outlet, if the position of the bore changed relative to the pedal that
could cause problems.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>1. If you continue highway driving, after you have
experienced the long travel and corrected it with a couple of pedal presses,
does it happen again? Or does it only happen once no matter how far you
drive? If it only ever happens once then it looks like a master seal
problem.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>2. Another test, once you feel the slackness, stop the
car where safe without using the clutch, and see if you have any free
play in the release arm. If there is, then something would appear to
be nudging the piston back into the bore. However, there should be a
spring inside the cylinder which is constantly trying to push the piston out,
and that should continually being taking up any free play. The purpose of
this is to take up any and all play from there on i.e. in the release bearing
and friction plate, it is this that makes the MGB clutch self-adjusting for
wear.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>As another part of this test, at various temperatures, by
pushing on the release arm move the push-rod and hence the piston all the
way back into the cylinder, let it go, and it should ease its way out
again. Make sure the master reservoir has some space at the top to avoid
the fluid overflowing.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>PaulH.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
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<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">It
is a bizarre problem. I was hoping someone might have had similar problems.
Since my last email, I have made two 15 mile drives with the same very
predictable issue. The master remains the primary suspect because the issue
happened after replacing the master cylinder. The slave cylinder was an
aftermarket replacement I put in about 4-5 years ago but the only thing I have
done with it is to drain the brake fluid.<o:p></o:p></SPAN></P>
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