Audi A6 Brake Switch Issues Trigger Multiple Warnings

Had a similar situation with my 2000 A6 1.8T last year. I have some basic experience working on cars, mainly doing simple maintenance tasks. The brake light switch issue caused similar electrical issues and warning lights. The brake pedal sensor was misaligned, causing the switch to falsely trigger. This triggered multiple warnings on the dash and affected other systems. The fix was surprisingly simple. The brake light switch needed adjustment rather than replacement. A mechanic showed me it was just slightly out of position. After proper alignment, all electrical issues disappeared immediately. Total cost was 0 Euro since it was just a positioning error. Before suggesting specific fixes for your case, could you share: Are the brake lights working intermittently or not at all? Does the brake pedal feel different than usual? When exactly do these warnings appear, during startup, while driving, or out of nowhere? Have you noticed any other electrical issues besides the infotainment system? This information would help determine if your issue matches what I experienced or if you might be dealing with a different electrical issue requiring more involved diagnosis.

Last service was at 105229 KM, and I can confirm the brake lights work intermittently. The brake pedal feels normal, but the warnings appear out of nowhere while driving. The automotive switch started acting up right after a heavy rain. The tail light assembly is dry inside, but the electrical connections might have been affected. No other electrical issues noticed besides the infotainment glitches you mentioned. Based on your experience, I will have a mechanic check the brake light switch alignment before considering a full replacement of the brake system components. The issue seems very similar to what you described. Good to know it might be a simple fix rather than a major repair.

Thanks for the additional details. Sounds exactly like what I experienced with my A6, especially the timing with the rain. After my brake light switch adjustment, I actually took some preventive steps to avoid future issues. Since our cars are similar and showing the same symptoms, here are some things that worked in my case: The intermittent function is a classic sign of moisture affecting the automotive switch contacts. I had my mechanic apply electrical contact cleaner to the brake light switch area and connections. This simple step, combined with the proper alignment, completely resolved the unusual warnings. Some tips from my experience: Have the mechanic check the rubber boot around the switch for tears, Make sure all brake system connectors are properly sealed, Consider applying dielectric grease to protect connections from future moisture The fact that your brake pedal feels normal is actually good news, matches my situation where it was just a connection issue, not a deeper brake system problem. Total repair time in my case was under an hour, and the vehicle safety systems returned to normal immediately after the fix. Just make sure whoever does the work understands these older models, as the switch positioning needs to be quite precise.

I appreciate this detailed feedback. The similarities between our cases are really helpful. Good call on checking the rubber boot and applying contact cleaner to the brake light switch, those are practical solutions I hadnt considered. The rain correlation makes even more sense now. Since my tail light assembly is dry but the electrical issues started after rain, focusing on the switch area connections seems like the right approach. The automotive switch probably just needs cleaning and proper alignment like in your case. Will have my mechanic look at it this week, focusing first on the electrical connections and switch position before jumping to replacements. The fact that your cars electrical issues cleared up with such a straightforward fix gives me confidence this wont require major work. Thanks for the specific tips about the dielectric grease and connector seals too. Since these cars seem prone to moisture-related brake switch problems, taking those preventive steps makes a lot of sense.