BRAKE warning light on

justjust73 said:
Ok thanks because i unplugged it and it stayed on so the problem could still be the pad side of the wiring

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The wiring loom for this is a known weak spot and so Audi stock a repair loom kit at around £54.

The wires tend to break where they go through into the engine compartment.

So it could well be that is what has happened to yours.

Some people just connect the two wires together and that disables the warning, you should be inspecting your brake pads regularly anyway, so the lack of a warning is not an issue if you maintain your car well.

Steve B
 
justjust73 said:
Ok thanks because i unplugged it and it stayed on so the problem could still be the pad side of the wiring
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If you unplug it and then shorten the connection in the plug on the cable from the engine compartment (e.g. screwdriver touching both pins) then if the light goes out then your cable from the plug to the dash is OK. Therefore the problem must be the pads (worn) or the other half of the connector on the pads or the cable between the two.

See http://www.a2oc.net/forum/showthread.php?18624-Brake-Pad-Wear-Sensor-Repair-Guide
 
I got break pad Waring sing on the dashboard, (Audi A2 1.4TDI diesel 2001 ) but there are no sensor built in to my front brake pads (rear is drum brake), I don’t have cable harness coming to the wheal(apart from ABS sensor wire and brake oil tube), is this time/mileage based waring sign? How do I rest this? , is this normal NOT to have wring harness for break pad sensor on audi a2 ?
 
audia2owner said:
I got break pad Waring sing on the dashboard, (Audi A2 1.4TDI diesel 2001 ) but there are no sensor built in to my front brake pads (rear is drum brake), I don’t have cable harness coming to the wheal(apart from ABS sensor wire and brake oil tube), is this time/mileage based waring sign? How do I rest this? , is this normal NOT to have wring harness for break pad sensor on audi a2 ?
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Are you looking at the correct brake?
As you look at the car from the front the brake pad sensor is on the brake on the right hand side (near side in the UK and Driver’s side in the rear of Europe)

if you pad wear warnibg has BG has just come on then it does seem to indicate that you have the loom on that side.
It could just be that your pads are genuinely worn, or it could be the very common loom fault.

Steve B
 
HI Steve,
Thank for the reply, i have look form all sides, there is no wiring harness coming to the wheal(apart form ABS cable), new brake pads have sensor but i got no ware to plug them(old pads didn't had any sensors or wires built in). warning light on the dash board is ministry.. brake-pad-monitoring.gif
 
audia2owner said:
HI Steve,
Thank for the reply, i have look form all sides, there is no wiring harness coming to the wheal(apart form ABS cable), new brake pads have sensor but i got no ware to plug them(old pads didn't had any sensors or wires built in). warning light on the dash board is ministry.. View attachment 32717
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it may be that soneone has taken the plug off and joined the two wires together because the old pads didn’t have sensors.
Trace the ABS loom back from the disc (on the side I mentioned) you should find a spot somewhere in that loom where the pad warning wires have been cut and connected together. It may even be inside the engine bay where the loom comes through from the brake.

If this warning has had only recently appeared (and the annoying BEEP) then it sounds like the temporary fix a previous owner has carried out has come undone.

Steve B
 
The wiring loom to the front nearside wheel is available as a spare part, because it is susceptible to damage when changing brake pads. I suspect, as Steve says, it's been bodged by a previous owner who didn't want to repair a broken loom properly.
 
As far as I'm aware, all UK spec A2s have brake wear sensors fitted to the front nearside wheel.

4qxdnnq.jpg


This is what you're looking for - where the tape is in this photo is where the loom splits in two - one part goes to the wheel speed sender and the other to the brake wear connector. I have come across cars where the loom has been neatly sliced off. Open circuit is bad - the only way to cancel the warning is to close the circuit, best achieved by using a new loom (which includes the speed sender part and goes back to the engine bay).
 
HI Guys,
I know this is an old thread but I have all the faults listed above plus one.
My car also appears to be going into a safe mode { wont go above 55mph } and the traction control light flashes.
Is this a loom problem ?
 
Is There a place inside the car you Can find the red and yellow wire? Just to test where the fault is??
 
Howey said:
Not sure but you could bridge the two pins thats how mine is due to damaged plug
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I already did (Down by the brakes) but the warning light still comes on.
That’s why I want to go closer to wherever the wires end up
 
Personally I would repair by replacing the loom. But if you want to completely disable the wear warning the best place to do it is on the instrument panel. If I recall correctly on the BLUE connector you need to join pins 2 and 24 together with a bridge to disable the warning. There is no way to turn off the warning using VCDS to code it out on the A2.
 
Elpres said:
I already did (Down by the brakes) but the warning light still comes on.
That’s why I want to go closer to wherever the wires end up
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I know a lot about this! The red wire goes to a connector at the base of the left A-pillar, I can look out the details if you wish. The yellow wire is actually an earth and joins the the main earth in a weld in the big loom that goes to the earth point at the base of the left A-pillar, but is very inaccessible high up under the dash just beneath the left quarter light, again further detail available if you wish. As I see it more or less pointless using these two test points as more than likely it will just confirm what you seem to know already, that is there is discontinuity in the loom from the brake!, assuming your short between the the two wires at the brake end is good.

I will offer my advice maybe tomorrow, it has been a very stressful day and it is late now.

Andy
 
Andrew said:
I know a lot about this! The red wire goes to a connector at the base of the left A-pillar, I can look out the details if you wish. The yellow wire is actually an earth and joins the the main earth in a weld in the big loom that goes to the earth point at the base of the left A-pillar, but is very inaccessible high up under the dash just beneath the left quarter light, again further detail available if you wish. As I see it more or less pointless using these two test points as more than likely it will just confirm what you seem to know already, that is there is discontinuity in the loom from the brake!, assuming your short between the the two wires at the brake end is good.

I will offer my advice maybe tomorrow, it has been a very stressful day and it is late now.

Andy
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Hi Andy, and thank you for taking your time to post.
I found another post on the web and the red wire seem to end up in the foot area at the a piller left side of the car, in a red connector.
I think the yellow wire is still grounded as I made my multimeter beep touching earth and the yellow wire.
Could I take this red wire in the red connector and ground it?
Do you know if the red wire coming from the sensor goes to the male or female connector in the a pillar foot area?
Thanks a lot..
 
Elpres said:
Hi Andy, and thank you for taking your time to post.
I found another post on the web and the red wire seem to end up in the foot area at the a piller left side of the car, in a red connector.
I think the yellow wire is still grounded as I made my multimeter beep touching earth and the yellow wire.
Could I take this red wire in the red connector and ground it?
Do you know if the red wire coming from the sensor goes to the male or female connector in the a pillar foot area?
Thanks a lot..
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Good Afternoon,

There is quite a lot of info on here about this brake pad warning wire, you don't need the web, try using Google with a search of 'a2oc brake pad sensor'.

Good, you have demonstrated no discontinuity in the yellow wire.

Yes you can ground the red wire in the left footwell and the warning will probably cancel unless there is a discontinuity in the red wire between here and the dash (not unkown). Most likely the warning will cancel and you have proved a discontinuity between here and the brake.

As to male female question look at the image in the link I posted in post 30.

More to say but need to dash to hospital.

Andy
 
Andrew said:
Good Afternoon,

There is quite a lot of info on here about this brake pad warning wire, you don't need the web, try using Google with a search of 'a2oc brake pad sensor'.

Good, you have demonstrated no discontinuity in the yellow wire.

Yes you can ground the red wire in the left footwell and the warning will probably cancel unless there is a discontinuity in the red wire between here and the dash (not unkown). Most likely the warning will cancel and you have proved a discontinuity between here and the brake.

As to male female question look at the image in the link I posted in post 30.

More to say but need to dash to hospital.

Andy
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Thanks again, only uncertainty is regarding the male/female thing, I did go through all the pictures in the post your referring to.
My guess would be that the red wire from the sensor would end up in the red male connector in the left footwell area, But I’m not sure. Can you clarify? Please
 
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