Paul,
Thanks for the advice. In fact I have now bitten the bullet and gone and
bought a nice new servo, but now I know how to take the old one apart I might
do it anyway, just because it bugged me so much that I couldn't!
Getting a new servo was simultaneously just what I needed to do, and probably a
total un-necessary spend of #149. It seems what I REALLY needed was the
instructions that came with it.
Of course, when I unpacked the new servo, I completely ignored the
instructions, and just bolted the new servo in exactly the same way the old one
came out - and, given the bracket design, exactly the way MG intended. That
is, with the cylinder horizontal, and the connector for the vacuum hose at the
bottom (a guide for the hose is part of the front support bracket, so the hose
has to go at the bottom to use this guide). This puts the air valve right at
the top. A bit like this:
http://www.cbett-carsales.co.uk/IMAGES/MGB-ENGINE-SM.jpg (not my car, just a
random photo off the 'net)
Once installed, I re-bled (for the umpteenth time) - the brakes seemed better,
but still not right. The pedal didn't quite reach the floor on the first pump
any more, but still required two pumps before the pedal felt right. So, STILL
felt like air in the system. Nevertheless, the brakes were working, so I
rewarded myself with a little drive :) :) :) Very happy to be driving a
little old car again for the first time in a couple of years!!!
Later, just out of curiosity, I started leafing through the instructions that
came with the servo. They said, quite explicitly, that it should be mounted
with the cylinder pointing up at between 30 and 45 degs, and rotated so that
the air valve was at least 30 degs below horizontal TO AID WITH BLEEDING. So
it sounds like the servo is full of air that won't come out - so I was right to
suspect the servo, but there may have been nothing wrong with the one I
removed!! It also explains why I never noticed a bleeding problem until I
replace the master cylinder (and my subsequent suspicions of the M/C); until I
did the M/C swap there hadn't been any opportunity for air to get into the
servo and get trapped there. I didn't have time to re-position the servo and
re-bleed last night, I hope to one evening this week, but I now feel far more
confident that I know what the problem is and I can fix it - wahoo!!
Richard & Sammy II
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