has anyone swapped....[dead bomb]

[Alex Kowalski]

jason wrote:

>well, after 12 pumps that were exactly the same
>pressure, i figure that the bomb has not yet
>detonated.  so, i'm assuming that it's not the
>culprit.

Pressure warning switch on the hydraulic servo as the cause of the autocheck
light flashing?

http://www.sjmautotechnik.com/trouble_shooting/brakeTSB47_92_2.html

In this case it could be a bad switch, or even a bad pump in the central
hydraulic system.  As I recall there is a filter in one of the lines that
can get clogged if the fluid hasn't been changed out in a long time.

Also, how about a faulty warning switch on the brake fluid reservoir cap?

These are just off the top of my head, I hope they help.  I can look up the
testing procedure for the pressure switch on the servo. in the Bentley.
That would neatly explain why you still have bomb function but a warning
light while the car is running.  If the brake servo itself has gone south,
expect to spend at least $250.  Ouch.

As far as the "sponginess" is concerned, I would do a full brake-fluid flush
and pressure bleed with nice, new clean brake fluid.

Alex Kowalski
'87 5KCSTQ
'86 5KCSTQ