[s-cars] Brake wear sensor question

[Igor Kessel]

Ivan Demkovitch wrote:
> Ok. Used voltmeter to check - seems like I get something weak(0.1-0.2V) and
> fluctuating at one of the pins.
> It could be my ground (suspension bolt) not really good choice or it might
> be broken wire.
> Will continue tomorrow..
> 
> Do you have any pointers on where to look for this wire at firewall?
> 
> -----Original Message-----
> From: Kent McLean [mailto:kentmclean at mindspring.com] 
> Sent: Monday, May 30, 2005 8:08 PM
> To: Ivan Demkovitch
> Cc: s-car-list at audifans.com
> Subject: Re: [s-cars] Brake wear sensor question
> 
> 
> Ivan Demkovitch wrote:
> 
>>Is there 2 front caliper sensors??
>>
>>Also, how do I know which pins? There is 3 wholes in connector. By 
>>just "looking" I seen copper in 2 of them. Is that correct approach??
> 
> 
> Each pair of pads in a front caliper will have a sensor,
> so there is a sensor on the left front brake and another
> on the right front brake.  The circuit goes to the left
> front first, which is why that is the side you want to
> short to ground.
> 
> If you have a voltmeter, attach the negative lead to
> a good ground, then test the holes with the positive
> lead.  (Be sure the ignition is on, to provide juice
> to the circuit.)  One of the holes should show 12V.
> If not, then you may have a break in the wiring
> "upstream". As one lister said, look by the firewall.
> 
> If you don't have a voltmeter, a test light should
> also work. Ground one lead, then insert the other
> into each hole. The "live" terminal is the one that
> lights the light.
> 
> Whichever terminal has 12V, that is the one you want
> to connect to ground.
> 
> --
> Kent McLean
> '94 100 S Avant, "Moody"
> '89 200 TQ, "Bad Puppy" up in smoke
> '56 Austin-Healey 100 BN2, for sale
> 

Ivan,
many years ago when your car was still in Larry's possession he once had 
the pads replaced in some unscrupulous garage that installed some cheap 
aftermarket pads w/o the embedded wear sensors. Which in turn had 
tripped the Autocheque.

After that he brought the car to me for the diagnostic. I cut off a 
couple of female (a.k.a. "the mother") connectors  off some old pads, 
shorted their wires and plugged them into the brake harnesses to fool 
Autocheck into thinking that the pads were OK. I also told Larry to keep 
an eye on the pad thickness since he no longer had the benefit of the 
Autocheck by his side. I told him not to worry about it too much and 
just replace the pads with the proper ones the next time they were due 
for replacement.

Evidently one of the connectors hastingly hacked by me has come loose 
and/or lost contact. Remove them, undo the electrical tape, solder the 
ends and plug them back in. You're going to perform the BBB conversion 
soon, right? In this case I wouldn't spend another minute on fixing the 
crappy G60 since you'll be adapting the Porsche pad sensors to the Audi 
harness anyway....

-- 
Igor Kessel
two turbo quattros