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Brake warning light woes!!!

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by fozworth, Jul 11, 2010.

  1. fozworth
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    fozworth Member

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    I know this problems have cropped up in various forms but I can't find a problem like mine . Basically my large brake warning light comes on and flashes and beeps 3 times but not that often and not generally when cold but from time to time when engine is at running temp and sometimes when cold but only now and again. It doesn't seem lazy on startup and the fluid is full and all pads are fine and new on front.the old front ones were worn past the sensors and I don't know if I needed to reset anything? But I can't think what else it is brakes are working fine.
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  2. GAudiTech
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    GAudiTech Member

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    Only when starting?. Had this issue a few times and there is a known fix for it. Its due to the current draw during starting affecting the level sensor and involves fitting a relay on to the sensor signal wire to dash panel which disconnects it under cranking.
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  3. fozworth
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    fozworth Member

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    Cheers , is that a main dealer only job plus any idear of the cost. Cheers
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  4. GAudiTech
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    GAudiTech Member

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    If your handy with wiring then its a 10min job. Its only a relay so wont cost much. Is it still under warranty?
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  5. fozworth
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    fozworth Member

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    No mate but if I knew exactly where it went I could get it done.
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  6. GAudiTech
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    GAudiTech Member

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    il give you a diagram if you want. Just to confirm.. When your cranking the engine.. the red brake warning light iluminates?. Just dont wanna give you a fix and turns out not to be that. PM me your email. Cheers
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  7. jwhat
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    jwhat Member

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    Could you PM me the fix too please.
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  8. GAudiTech
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    GAudiTech Member

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    Email sent..
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  9. fozworth
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    fozworth Member

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    Thanks mate I've printed it off but I will defo have to get someone to do it . Thanks again though. I will do a search to see if somevone is near to me that can do the job
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  10. s4marsh
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    s4marsh Member

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    i have this problem on a 99 S4, i read today that if your battery is on its way out it will cause this problem due to the voltage drop when cranking the engine. Would a battery test show the battery performance dropping and would a new battery resolve it? My problem only started when i'd been away working and had to charge the battery when i got home it never felt 100% for a while when starting but seems fine now
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  11. mt.audi
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    mt.audi New Member

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    have the same problem. red brake light iluminates when cranking. i would appreciate a diagram for fitting relay. cheers
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  12. jon1982
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    jon1982 diesel dodger

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    it is true about the battery because it did the brake warning light on mine a few times not long before the battery died, new battery fitted and i have,nt seen the warning light since.
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