5k brakes

[Bernard Littau]

Hi David,

Perhaps some confusion over the term solid or hard pedal.  Here is a link
that describes what I was attempting to describe as far as counting pumps:
http://www.sjmautotechnik.com/brake.html#bomb

Specifically this paragraph:
The test for the accumulator, is to run the engine for a few minutes, turn
off the engine, and then pump the brake pedal until the pedal feels hard,
(no more power assist). Normally with a good, working brake accumulator,
this test takes 25-35 pumps on the pedal before the pedal gets hard. If the
pedal gets hard with only a few pumps on the pedal, the brake accumulator is
defective and should be replaced.

You almost certainly have a bad bomb, perhaps a bad hydraulic pump.

I have heard people with immense Audi experience and credibility claim a bad
bomb can mimic a failing MC.  I, and others, simply have difficulty
believing this.  So be it.

Fix the bomb and hydraulic pump (if needed), and see if both the warning
light and the pedal to the floor go away as problems.

Best,

Bernard Littau
Woodinville, WA
'88 5ktq

>
> Evening all,
>
> I was asked to describe how many pumps it took to get to solid pedal after
> running the engine.
>
> Here are the results of numerous tests:
>
> - no engine, stood on the pedal for 5 minutes, no fade at all, rock solid
> about 25% from the top
>
> - ran motor for 5 minutes, press brake, solid for about 30 seconds then
> slowly fades to the floor, alarm comes on.  Spongy brake feel and buzzerat
> every press. Alarm goes off 10 seconds after letting off the brake.
>
> - disconnected the two fluid conectors and still get alarm.
>
> - turn off motor, solid brake on first press. Pushing REALLY hard and can
> feel pressure pushing back on the pedal, feels wierd :-P
>
> - turn motor on again, normal braking seems fine, to the floor pressure,
> again brake fade.
>
> Anything else I can try? Any conclusions?
>
> On another topic, I have also an irratic idle, since the talk was
> about the
> isv, I swapped a spare one in, after spraying it with carb cleaner and
> drying. Now, I have a solid idle at 2000rpm. Disconnected the harness and
> still ran at 2000. I guess both isv's are toast huh?
>
> Thanks
> David Templeton
> '85 5Ks wagon
>