87 5ktq ... wierd brake problem

[Simon Allcorn]

That was what was wrong with mine.

Take out the ABS fuse so that when you start the car in the morning the ABS
never comes on and see if the problem is still there. (Since the ABS fails
anyway this should not present any safety worries)

The ABS fuses is in the top of the relay under the glove box (on a UK RHD
coupe anyway).

P.S. Cheap way to check the sensors: 

1. Wire up a multimeter to each sensor in turn with the setting on a low
voltage (1V) AC setting. 

2. Drive the car

3. The Multimeter should show something, though the value of the reading has
no meaning since the multimeter is measuring 50 / 60 Hz and the wheel sensor
has a continuously change frequency, BUT this should show you that the wheel
sensor is doing something.

Found out that mine just needed to be reset with the plastic spaces.


Simon

> -----Original Message-----
> From:	Beatty, Robert [SMTP:BeattyR at ummhc.org]
> Sent:	Monday, February 05, 2001 2:51 PM
> To:	'Simon Allcorn'; Beatty, Robert; 'quattro at audifans.com'
> Subject:	RE: 87 5ktq ... wierd brake problem
> 
> Yes it has ABS, which switches off after about 100yrds of driving, as i
> have
> at least one bad wheel sensor.
> 
> Rob
> 
> -----Original Message-----
> From: Simon Allcorn [mailto:Simon.Allcorn at CARTESIAN.co.uk]
> Sent: Monday, February 05, 2001 9:48 AM
> To: 'Beatty, Robert'; 'quattro at audifans.com'
> Subject: RE: 87 5ktq ... wierd brake problem
> 
> 
> Does the car have ABS ?
> 
> My old 87 coupe quattro had similar symptoms to this but after the first
> press of the brake (solid no effect) the ABS would then turn off and the
> brake's would work fine all be it with no ABS.
> 
> > -----Original Message-----
> > From:	Beatty, Robert [SMTP:BeattyR at ummhc.org]
> > Sent:	Monday, February 05, 2001 2:38 PM
> > To:	'quattro at audifans.com'
> > Subject:	87 5ktq ... wierd brake problem
> > 
> > Hey gang,
> > 
> > Problem I'm having is this....
> > 
> > Ocasionally when starting the car in the morning, the brake pedal is
> VERY
> > hard, as if the hydralic pump wasnt working at all.  It does NOT happen
> > every day perhaps 1 day in 10.  After one hard application of the
> brakes,
> > the problem is gone and I experience no other symptoms other than the
> > Autocheck brake symbol coming on.  However, that also comes on prolly 1
> > day
> > every 3 after approx 30 seconds of running time.  I know my bomb needs
> to
> > be
> > replaced as it doesnt last more than 7 or 8 pumps.  Is this problem
> > related
> > to the bomb or is there something else going on?  Most everything else
> in
> > the brakes is new.  Rebuilt G-60's/new rotors,  New MC,  I'm on my 3rd
> > hydralic pump in a year though (all of them used however)  I have
> replaced
> > what o-rings were reachable while the pump was on the motor and have
> also
> > replaced the supply line from the pump to the steering rack.  I
> currently
> > dont have any noticeble hydralic or brake fluid loss.
> > 
> > Any ideas on this?  Is it the bomb?
> > 
> > Thanks in advance.
> > 
> > Rob