RSQ3 Brake Light Switch Malfunction: Quick Fix Guide

Last month I encountered similar brake light warnings on my 2019 RS4. The error messages pointed to a faulty brake light switch, a common issue in these models. The tail light assembly was functioning correctly, but the brake switch itself had developed intermittent contact issues. The repair involved replacing the brake switch module located near the brake pedal assembly. This is actually a critical safety component that not only controls the brake lights but also communicates with various vehicle systems including cruise control and start-stop functionality. While the automotive switch itself is a relatively simple part, accessing it requires careful removal of under-dash panels. The main concern isnt just the brake light functionality, a faulty brake switch can cause false readings in multiple vehicle systems. This repair falls under the safety-critical category since brake lights are essential safety features. The job typically requires specific diagnostic equipment to properly reset the system and clear error codes after installation. The cars computer needs proper recalibration to recognize the new brake switch. Best approach is having a certified shop perform the repair since they will have the correct diagnostic tools and can properly validate all related systems are functioning correctly after replacement.

Thanks for sharing your experience. Had the exact same electrical issue with my RSQ3 back then. The brake pedal switch was indeed causing those warning lights. Good to hear your repair shop figured it out quickly. Quick question, do you recall the final cost for your switch replacement? Also, have any other vehicle safety concerns popped up since getting it fixed? Just want to compare notes since these problems can sometimes be related.

Had the car checked and it turned out there was actually no defective brake light switch, the issue was just personal error. The brake pedal wasnt fully releasing after being pressed, causing false brake system warnings. A simple adjustment of my driving position solved the problem completely. The mechanic showed me the proper pedal operation and checked the entire brake switch system to be thorough. All tail light and brake light functions were working perfectly. The diagnostic scan showed no actual faults with the automotive switch components. Best part, no repair costs since no parts needed replacement. The warning messages have completely stopped, and the brake lights are functioning normally. This experience shows that sometimes what seems like a complex electrical issue can have a simple solution. Having had no brake system warnings or related problems since that visit three months ago. Just goes to show its worth getting things checked out professionally, even if the fix ends up being straightforward.

Thanks for the update. Funny how our situations were different. After taking my car to the shop yesterday, they diagnosed a faulty brake switch causing those warnings. The repair was straightforward, 45 minutes of labor and a new brake light switch for 180 Euro total. The mechanic showed me the worn contacts on the old switch that triggered those system warnings. Since the automotive switch replacement, all brake lights work perfectly and the error messages have cleared completely. The cars computer shows no more fault codes. Good to know about checking pedal position though. Will keep that in mind if any brake system warnings pop up again. Simple checks first before assuming parts need replacing. Really appreciate everyone sharing their experiences with these brake light issues. Helps knowing what to expect when similar problems come up.