Problem with brakes, need some help.

[Konstantin Bogach]

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[ Picked text/plain from multipart/alternative ]
Robert,

my bomb is DEAD as I mentioned.  What I don't know is that would bad
bomb cause soft brakes, like a little air is left in the system.  But I
used pressure bleeder and did thoroughly.
It just came to me that I should've check proportioning valve when I
noticed that rears are not working.  But it is most misterious part in
the car.  I took one apart (from another car) and could not figure out
how it works.  I am not sure what to check as besides frozen arm.

Another question:  can the air in the system cause working fronts and
not working rears?  I see it only if some certain conditions occur in
proportioning valve.  It is theory.  The question is: anybody saw it in
real life?

Thank you.
Konstantin.

>
>
>> Hi listers.
>>
>> I finished complete brake system overhaul, bleeded but brakes are
>> soft
>> and car is reluctant to stop. Bomb  is  dead.
>> With engine running pedal is pulsating as it goes down.  Bad bomb
>> causes
>> it, according to some posts in archives.
>> After hard braking rear disks are dead cold.  I aslo want to mention
>>
>> that ABS off light stays on when I try to switch it off (relay
>> clicks).
>> But I believe it has nothing to do with soft brakes but ... just in
>> case.
>>
>> My question is: can just bad bomb cause mentioned symptoms?
>>
>> My second 200tq had also bad bomb before I changed it but brakes
>> were ok
>> - not soft, no pulsation and brakes engaged ok.  This fact causes
>> some
>> confusion in my head.
>>
>> Thank you.
>> Konstantin Bogach.
>> 200tq '89
>> 200tqa '89
>> urS4 '93
>