[Biturbos4] brake problem

Michael Benno mbenno at yahoo.com
Wed Dec 1 14:29:45 EST 2004

Well it sounds like air and or moisture has gotten into your system. The conditions you describe are similar.
I would definitively flush and bleed the system, especially if yuo have been using the same fluid for 2 years.

Keman <keman at interwolf.net> wrote:
Have you got a vag-com tool and a pressurized brake bleeder?

If not take it to the dealer and have em bleed the brakes for you. They
pressurize the master cylinder to 2 bar (it's important here, 2 bar not
just 1), and put the ABS/ESP into diag mode and do constant activation for
each corner while bleeding. That gets all the air outa the system and
purges the lines. Unfortunately they can't do this with motul because it's
a big audi tool with a tank of DOT4 brake fluid in it that does the
pressurizing. You could later bleed the system with motul 600 using the
normal methods.

I've seen this problem and this bleeding method usually cures it.

- Keman

On Wed, 1 Dec 2004, Bill Neilsen wrote:

> I have a 2001 S4 with approx. 35k mi. Stoptechbrakes. Motul fluid in for
> about 2 years.
> In the last months the pedal has gotten softer and softer. It slowly goes
> in farther and farther as pressure is applied. At the end of the travel the
> ABS engages even before the car comes to a stop.
> The fluid level is fine and I spot no leakage around any of the calipers.
> Thoughts?
> Thanks, Bill
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