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RE: pump is toast (was: intermittent stalling)
In message <199810102314_MC2-5C49-8C64@compuserve.com> Craig Krivin writes:
> OK, now youíre getting ME nervous. I acquired a 91 90Q about 2 weeks a> go. >
> Iíve noticed that upon a cold start, the red BRAKE light stays lit for > from
> several seconds to a minute or so, then goes out. Iíve assumed that th> is
> was just a sign that it takes some time for ďthingsĒ to pressurize. > But
> Iíve also noted that the brake pedal is somewhat spongy. The car has a> bout
> 69,000 miles. Am I to assume that I to have to consider rebuilding my
> power steering pump?
IMO it's more likely to be the brake servo than the pump.
a) Pull the return line from the servo to the hydraulic oil reservior -
carefully, because it's easy to break off the plastic return nozzle.
It's sometimes a good idea to saw the clip off with a small hacksaw
rather than extert torque on the reservoir. If it drips continuously,
however slowly, it's toast.
b) There should be a low pressure warning switch on the side of the
turbo. It should take 20+ brake depressions to cause this switch
to close. See how many it takes when the car is first stopped -
less than around fifteen means a bad bomb. Run the engine to
charge the system up again (let it run for thirty seconds after
the switch opens to indicate good pressure) and leave the car
overnight. Do another count in the morning - if it's only a few
or none at all then the system has leaked down overnight (I suspect
this is your problem) and the results of test a) above will tell
you whether it's the servo leaking down or the bomb.
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