[urq] bomb test variation with S4 brakes?

[Martin Pajak]

Brady,

Have you checked for moisture on the inside of the car?
My old '83 had a leak in the booster on the inside of the car.
Nice puddle of fluid under the carped beneath the pedals.

With as you describe "pedal travel is now and has always been pretty short
and firm"
There should not be a decrease from 30 to 10 pumps from your bomb.
I can see decrease from 30 to say 25.
Did you check how much fluid actually goes into the bomb?
If the charge press in the bomb is high it will not allow it to fill up to
capacity.

Hope this helps.
-- 
Martin Pajak

http://www.quattro.ca

1982 Audi Ur-quattro (50,000 mi) new project
1983 Audi Ur-quattro (85,000 mi) Concourse d'Elegance
1985 Audi Ur-quattro (212,000 km) Euro spec. import mit 3B :)
1987 Audi 4000s quattro (205,000 km) wintervagen mit 7A :)


> brady zq
> That would be me.
>
> I get 10-12 pumps from as fully charged a bomb as I can get.
>
> On ymy early 83 urq with twin piston G60's, urS4 rears, and braided
> stainless lines, orignial equipment MC, and new bomb, my pedal travel is
> now
> and has always been pretty short and firm. The only time it is mushy is
> when
> I do the bomb test with the engine off.
>
> One thing I should mention, and this is not new (as in it occurred before
> the bomb switch and still does) is that I sometimes hear a "hissing" noise
> from the area of the brake pedal accompanied by very faint feeling change
> in
> the pedal. This happens when I have already stopped for a traffic light or
> something, after light braking, but with my foot on the brake pedal
> lightly
> to keep the car  from rolling. No moisture is evident form this. It's
> almost
> as if the bomb is refilling loudly. The noise is not coming from the pump.
> It's much closer than that.
>
> And I don't have cruise control, so it's not likely to be venting vacuum
> at
> the brake pedal.
>
> Any ideas?
>
> Cheers,
> Brady
>
>>From: "Buchholz, Steven" <Steven.Buchholz at kla-tencor.com>
>>
>>... I don't recall anyone saying that it did.  Someone expressed concern
>>that their brand new PA was faulty because they weren't getting the
>>expected number of assisted pedal applications when the engine was shut
>>off.  My point was only that *if for some reason* you have longer pedal
>>travel than Audi originally planned for when they designed the system
>> that
>>you might well expect the bomb will support fewer brake applications
>> fewer
>>pedal depressions.
>>
>>Steve B
>>San José, CA (USA)
>> >
>> > 1. I don't see how the bomb is going to change the pedal travel.
>>_______________________________________________
>
>
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