So about a year ago I put a ("new") used brake booster on the 300TD
after spending a lot of time chasing a no-brake-boost problem, and
finally decided it was the brake booster after huge amounts of effort on
that. Put on a new one and it was fine. So a few weeks ago same
problem, and no shutoff, I figured the used booster I put on had crapped
out too. Ordered one from the list mom, put it on last weekend, still
no brake boost. sh*t. So today I put the previous one back on and
started chasing vac problems again with the vac meter, and by isolating
things it seems to be related to the lock system (they have never really
worked) or something else not very critical, maybe in the HVAC system
(which is not working either for some time. I plugged off one tee going
to the locks, have a bit better vac now but still not what it should be,
and the car will shut off when I rev it a bit. Brakes seem to be OK,
but I gotta bleed them now, again.
So Occam's razor proves correct once again, I should have taken a look
at that first. But I am really good now at changing brake boosters and
master cylinders, in particular that last nut way up under the pedal
bracket that you have to contort to get at.
--R
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