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brake switch is bad or maybe the plastic grommet in which the switch is mounted is worn (if this is anything like my 1990 Audi V8). The plastic grommet is a loose fit and allows the switch to self adjust. If it's too worn the switch slides too far forward. First try removing the switch from the grommet(sp?); then remove the grommet. Now you can test the switch and determine whether or not it is the problem. If not, pinch the grommet so the hole tightens then reinstall and reinstall the switch. Now try the pedal. If this doesn't work, replace the grommet with a new one from the dealer.

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Q: Why would the brake lights be on while driving a 1999 Audi A4?
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