In reply to a message from Frank Andersen sent Sat 26 Jan 2008:
It started back when I had a leaky rear caliper. So the air in the
system thing makes some sense. However I used a bleeding pump and
pulled brake fluid through the system until I got fresh clean
fluid. It was better after the brake work but with the very cold
weather it is now more pronounced.
Could the master cylinder have gotten air caught in it and a system
bleed from the calipers would not have gotten it out? Or could have
the air damaged an O-ring or packing?
I have heard there is a brake booster somewhere. My main concerns
is that it may be going bad. That is not a friendly thought. But,
in both the manual and parts book I cannot find a brake booster and
You can’t possibly miss the brake booster, John - it’s a huge round
thing immediately behind, and attached to, the master cylinder. And
listening there may, just may, tell something…
Two things; with any air in the system the pedal will be so
characteristically spongy that it cannot be missed. And; the ms may leak
brake fkuid into the booster, and accumulated it may ‘slurp’ as the
liquid is drawn out when air is drawn out of the booster after braking.
Though; while such leaking is not unknown, noises like that is not - but
listening at the booster may tell. There is no sure-fire way of
detecting, and cure, such a leak except by dismantling - abnormal drop
in reservoir fluid level would be an indication, of course. And you can
disconnect the one-way valve (a possible noise source as well) in the
brake booster air line and see if it is drenched in brake fluid…
If the brakes are otherwise working well, it’s unlikely to cause a
sudden collapse, but on the other hand; any brake anomaly should be
treated with respect. Like an effort to precisely locate the place of
the noise, if not the cause. Also; if the noise is always there, or only
with the engine running or while car is moving - and permutations…?
xj6 85 Sov Europe (UK/NZ)===================================================
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