[s-cars] Bad brake check-valve??

[Mike Claire]

I'm being distracted from my quest to spend more time
and money on go-fast stuff - my brakes are pretty much
on strike.  Can't get the brake light to go off today.
 I guess I need to pay some attention :(

My brake light stays on, and I feel the brake pedal
pulsating.  I can actually hear a metallic pulsating
noise in sync with the pedal pulse from somewhere
close to the firewall (seems like it anyway).  But
when I open the hood the noise cannot be heard.  Get
back in the car and shut the door, sure enough, the
noise is still there.  I can hear it at idle.  It goes
up and down in frequency with rpm.

Here's the thing.  The car has done this on 3 separate
occasions over the last 3 months.  After several hours
of this it goes back to normal and the brakes work
100% fine.  With the car off I can pump the brakes 30
times before they are hard.

One other thing.  When the brakes are supposedly
working "fine", if I keep my foot on the brake for a
couple minutes the brake light comes on.  Usually if I
pick up the idle it will go away.  But again, if I
pump the brake with the car off it would take 30 pumps
to go hard.

So - my best guess is that my brake pressure
accumulator (bomb) has a bad check-valve.  But it's
not worn out.

I was sure enough of this diagnosis to buy a new bomb
from Blau.  Now I'm getting cold feet before actually
replacing it.  What do you guys think?  What else
could it be?


Mike


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