'88 5ktqa brake warning light mystery

[Ben Swann]

As Bernie suggests,  the car had awiring fault.  I fixed it similarly.

Ben
----- Original Message ----- 
From: "Bernie Benz" <b.benz at charter.net>
To: "Ben Swann" <benswann at comcast.net>
Cc: "200q20V mailing list" <200q20v at audifans.com>
Sent: Friday, July 23, 2004 4:54 PM
Subject: Re: '88 5ktqa brake warning light mystery


> Ben,
>
> I sold my 5K Bentley so can't help in detail, but it must be very similar
to
> the 200-20V.  Do you have the 5K Bentley?
>
> The "(O)" symbol is the pad wear symbol, is it not?  A good pad wear
system
> provides ground to the board computer display.  If grounding the lead from
> the driver's side pad wear connector to the display (bn/bk?) does not
> eliminate the light you most probably have an broken wire, BTDT.  The pad
> side of this connecter /wire should be at ground thru the two pads.  I
> couldn't find the break so went upstream somewhere in the engine
compartment
> and permantly grounded the wire there.  IMO, you don't need pad sensors
> anyway, inasmuch as the backing plates rubbing on the unworn rotor surface
> annular rings will give ample warning without damaging the rotor surface.
>
> Bernie
>
> > From: "Ben Swann" <benswann at comcast.net>
> > Organization: Swann
> > Reply-To: Ben Swann <benswann at comcast.net>
> > Date: Fri, 23 Jul 2004 14:17:22 -0400
> > To: <quattro at audifans.com>, <200q20v at audifans.com>
> > Cc: Ben Swann <benswann at comcast.net>
> > Subject: '88 5ktqa brake warning light mystery
> >
> > Ever since I have put this '88 5ktq avant back together again and pretty
much
> > eliminated any quirks, a problem still eludes me.  Brake pads are
relatively
> > new all-around, all reserviors full and power steering pump has been
changed
> > to known good working one, fresh pentosin hydr. fluid, etc.  Yet I get
this
> > brake warning symbol when the ignition is turned on, regardless of
whether
> > engine is running or not.  This is the Brake or ((!)) symbol which stays
on
> > for the duration while ignition is on.  Occasionally I get a red
triangle
> > warning for brake pads worn when I step on the pedal hard/more forceful
> > braking.  I checked the lead to the padwear indicator and both sides in
front
> > have continuity, and being sceptical, I bypassed them with a jumper
wire, but
> > it doesn't  help.
> >
> > ABS seems to be working fine, and braking and steering seems to be
working
> > fine.
> >
> > Anyone have this happen before?  What could be triggering this?  Perhaps
there
> > is a sensor somewhere that I have overlooked - so far I have checked: 1)
pad
> > wear indicator leads front right and left, 2) power steering /hydr.
fluid
> > reservior, 3) Brake fluid reservior 4) pressure sensor located at back
of
> > MC/brake booster  cyl.  There is another set of leads near brake res.
tied off
> > that are not connected to anything, but they were that way and I think I
have
> > seen them tied off on other cars.
> >
> > Ben
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>