Brakes Hydraulic system S6 / A6 C4

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#1
Original: German · machine translated
Hello.

I have a S6 C4 Bj 1996 with the 4.2 liter V8 engine. I know that this is not a V8 or A8, but most of the A8 technology is therefore also the question here.
As the hydraulic pump lost liquid, I got a regenerated pump and had it installed by the Audi workshop. This pump is a tandem wing pump which is two-circuited.

When I picked up the car, the brake pedal was hard, the master and the technician had not really noticed, you can do nothing now and it was not at all out that the pump was responsible for the braking force.
Days later, she was admitted to the office. Now the next step is to measure the hydraulic pressure, I'm just not sure if what brings the state is as follows.

If the brake pedal is soft, the best thing to do is to blow up the speed over 3000, then it usually stays that way, only when parking at low speed and frequent bems operations can it become hard again. Also directly at the start the pedal is often not hard, if it was still soft from the switch off. Overall, the effect of the hard pedal has become rarer since I brought the car out of the AUDI Werstatt, but not away.

Where should one look for the error, at the pressure vessel or at the pump, is there a hydraulic plan for the matter? Which part is responsible for what and how does it work? Would be really grateful for help.

Best regards Martin
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#2
Hallo Martin,

ich denke die Pumpe hat was... Denn wenn meiner im Leerlauf dreht, kann ich die Lenkung drehen und die Bremse geht trotzdem "weich", und das trotz eines etwas lädierten Druckspeichers.

Lenkung, Bremse, Pumpe und Druckspeicher bilden ein geschlossenes System im C4 AEC. Der Druckspeicher gleicht den einbrechenden Druck aus, wenn dir während der Fahrt der Motor abstirbt. Dann reicht der Haltedruck noch aus, sauber und gefahrlos anzuhalten. Lass den Druck der Pumpe prüfen, denn da denke ich, hängt der Hammer....

Gruß Uwe
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