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Red brake warning light but only when warm

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by Thacker, May 9, 2013.

  1. Thacker

    Thacker New Member

    Sep 27, 2010
    Likes Received:
    I have a B7 2.0 tdi and I'm getting the red brake warning light, but not on cold start up only when the car is fully warmed up.

    I've replaced the batterry but it is still doing it?

    I used to have a B6 S4 and that did it also but only on cold morning / cold start ups? Any ideas?

    Is it likely to be the brake fluid reservoir sensor?

    Many Thanks
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  3. V6 Quatt

    V6 Quatt Well-Known Member

    Feb 29, 2008
    Likes Received:
    Check the reservoir levels first and top up if required usually if levels slightly low will bring light on

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