Brake problem Passat 3BG

3 posts · 3,538 views · started

#1
Original: German · machine translated
Hey, guys.

I have a problem with my Passat Variant 4Motion 2.8L. The vehicle is Bj. ==References== ==References==
==References====External links== 5-10 km) does not release the front brake, although it was hardly used on this track. The EDS or EDS light up occasionally. ABS light (simultaneously) on- that happens max. once a month. So I did not pay much attention to this.
As soon as the ignition is switched off, the lamps don't light up when the engine starts again - it's quiet again. The braking effect is flawless. I can't tell the difference to the past.
When stepping on the brake in a standing position, a slight hissing, similar to the hissing on an air-assisted truck brake, is to be heard.

Crazyly, I have the same problem with my 10V Urquattro (MB). There, the piston in the main brake cylinder seems to warp when it exceeds a certain temperature (in the engine compartment it is quite warm – loader).
(Only one line from the HBZ leads to the front wheels in the Uri - according to the Audi ABS-SSP, this is the case with all-wheelers)
As soon as I cool down the main brake cylinder, the brakes will dissolve immediately. When the wheels are no longer running freely, the pressure point changes when stepping on the brake. The case seems clear here.

Can / must I assume that the passat is also a defective HBZ. There the HBZ seems to be more hidden mounted. It's as obvious as the Uri, it's not installed.
Thank you for your tips
Greetings
Rainer
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#2
Ist denn der Unterdruckverstärker undicht? Hatte ich letztens beim Galaxy, sonst kein Fehler, halt nur dieses zischen wie bei ner Druckluftbremse.
Was sagt der Fehlerspeicher?
Aber beim Uri ist es ja kein Geheimnis das die HBZ´s den Geist aufgeben.
Grüsse Stefan
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#3
Hallo Stefan

Danke für deinen Hinweis. In der Zwischenzeithabe ich mir die Bremsbeleäge angeschaut. Vorn links waren komplett verschlissen (beide Beläge gleich). Rechts hatten die Beläge noch ca. 70%. Also scheint das Problem vorn links zu sein.
Für mich stellt sich die Frage, ob das Problem im ESP-Regelkreis liegen könnte?
Obwohl: bei abgeschaltetem ESP zeigt sich das gleiche Verhalten der Bremse.
Möglicherweise klemmt nur der Kolben des linken vorderen Bremssattels.
Der Fehlerspeicher ist leer.

Ist es eigentlich richtig, dass man zum Entlüften eines Bremssystems mit ESP spezielle Geräte benötigt?

Gruss
Rainer
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