Intermittent brake fault

[Mark Rosenkrantz]

Have you tired engaging ABS by braking hard to see if that kicks on the
warning?  Red means some sensor input is out of bound and the computer
"sees" a problem and/or can't calculate a solution to the inputs.  With a
red indication, ABS, traction control, and ESP (which I know you don't have)
are all disengaged.

Have you had any work done recently that would've aligned the car (steering
wheel position calibration) or taken the center console apart (yaw sensor)?

If you can't force the red indication, have no suspects due to other
maintenance, and the computer has no codes stored... best advice I can give
is to wait until it gets worse.  It could be a lot of things, including ABS
module itself.

Mark Rosenkrantz

On Sat, Nov 27, 2010 at 12:56 PM, Richard van der Hoff <
quattro at rvanderhoff.org.uk> wrote:

> Hi folks,
>
> Since we've been on the topic of intermittent fault indicators this
> week, here's another one:
>
> Patient is a 1999 (B5) S4. Three or four times lately the big flashing
> red brake fault indicator has come up on the driver information display.
> It flashes away for a few secods, and then stops. I've checked the fluid
> level (which seems to be fine) and have hooked up the VAG-COM (no stored
> codes), but haven't really looked much further (it's a bit cold to be
> poking around tbh...)
>
> The brakes seem fine, but obviously having the big red warning coming on
> is a bit worrying. Any suggestions as to things to check?
>
> Thanks
>
> Richard
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