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Thread: Brake pad warning fault

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  1. Brake pad warning fault 
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    My 2006 A6 Allroad suddenly started showing a brake pad warning a week ago. All pads and discs front and rear are like new, hardly any wear. After disconnecting brake warning cables from both sides at the front the warning is still showing, there are no fault codes on the braking system. Can anyone advise what the fault may be. I don't remember connecting brake pad wear cables at the rear, think they are front only. Thanks
     
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  2. Re: Brake pad warning fault 
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    By the way testing the voltage on the supply side I am getting 10.36 volts on both sides with the ignition on.
     
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  3. Re: Brake pad warning fault 
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    There are no rear sensors.

    check the plugs for crud or broken wires.

    The sensors should be open circuit until worn away then the circuit earths via the brake disc.
    Dan
    2009/2010 2.0 TDIe SE
     
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  4. Re: Brake pad warning fault 
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    Quote Originally Posted by dan2485 View Post
    The sensors should be open circuit until worn away then the circuit earths via the brake disc.
    The system works as a closed circuit to keep the light off, disconnect the wires and it will come on, you have to bridge the terminals. The problem is normally with the left strut harness. The function is not linked to the diagnostics.
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
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  5. Re: Brake pad warning fault 
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    Follow the wires to the loom or rear of dash binnacle, on my A4 cabby it was green/brown , slice in bridge wire straight to body earth, the light will never come back and the vehicle check system still works correctly.
    Whilst you should always monitor your brake ware safely, this can save you hours of trying to find damage to the sensor wire and is what people using after market pad upgrades do to be rid of premature warnings.
    A6 2.4 SE (2000)S3 1.8T (2001)80 Coupe 2.3 (1991)
    A3 1.8T sport (1997)A4 3.0 QST (2002)
    80 Coupe 2.6S (1995)A4 Cab 2.4 sport (2002) Another 2.6 '95 coupe in byzanz purple
    '88 type 89 90 saloon kv 5 pot A4 1.8T 2001
     
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  6. Re: Brake pad warning fault 
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    I wondered why it was a double cable, the old system used to just be one cable, when the pad was worn the metal contact would make a circuit with the brake disc and light the warning. As my car is LHD would the offending cable still be likely the same side? Of course I visibly checked all cables and everything looked fine, why does one spur go into the stub axle?
     
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  7. Re: Brake pad warning fault 
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    As I got a voltage on both sides on the supply side sockets that suggests no open circuit on supply therefore the fault should lie on the pad side. My meter probes were too big to get in the pad socket and check continuity therefore I will have to modify my probes and hopefully will find one side open circuit, we will see. Thanks for all the advice.
     
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  8. Re: Brake pad warning fault 
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    The system has always worked on the broken circuit principle, never on a disc contact principle as this would result in a high hysteresis circuit which would result in warning light flickering.
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
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  9. Re: Brake pad warning fault 
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    Thank you Crasher, point taken
     
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