I had this fault on a 2006 Jetta TDI,brake lights staying on,no effect on performance,on live data switch was working ok.
The problem with this,lay in the engine ECU.Removed ECU and there was burn damage internally.
I got a local Technician to repair,and it has been ok since,this was 3 years ago.
May not be your problem but thought it might be worth mentioning,
Regards Christy Doyle.
Forgot to mention there was a code for brake light switch retrieved from engine ECU.also the hall sensor on master cylinder had already been replaced.
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