[urq] bomb test variation with S4 brakes?

Martin Pajak martin at quattro.ca
Mon Aug 7 11:34:47 EDT 2006


Number of of times you can pump the brakes will only be determined by your
pedal travel, not what brakes you have..
If you have air in the system or spongy hoses, your pedal travel will be
longer and number of pumps less.. however I can not see how that number
can be reduced to 10 if you have properly functioning brakes.

Hmmm... try this.  Empty your bomb, mark the level in the reservoir.  Then
run the car for few minutes to charge the bomb and measure your fluid
level once again.  Let me know how much is gone and I can can compare with

This will let you know if the bomb is charging to it's capacity.  If not
the pressure on the bomb might be higher than stock.

Hope this helps.
Martin Pajak


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
> Hi All,
> I just replaced my bomb on my early 83 urq. It was down to "Hmm, will I
> get
> any assist when I brake this time?"
> I got a great deal on a new Lemforder bomb at my Euro FLAPS.
> While driving, everything is wonderful now.
> BUT, when I do the bomb test, all I get are about 10 pumps before it goes
> hard.
> I have twin piston G60's up front and urS4 rears. Might these somehow
> influence the number of pumps before the pedal goes hard?
> Ot, did I buy a bomb that had been sitting on the shelf long enough to
> lose
> some charge?
> Ideas?
> Thanks.
> Cheers,
> Brady
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