Audi A6 Soft Brake Pedal Signals Booster Sensor Failure

I had a similar brake performance issue on my 2020 Audi A4 2.0 TFSI. The symptoms matched exactly, soft pedal feel and reduced braking power. The ABS system warning light also appeared on the dashboard. The root cause was incorrectly bled brake lines after previous maintenance work. Air bubbles in the brake lines created inconsistent pressure, affecting the brake booster and causing erratic pressure sensor readings. Diagnostic tools showed multiple brake system fault codes. This required a complete professional brake system bleed using specialized equipment to ensure all air was removed. The technician also tested the brake booster and pressure sensor functionality. The brake booster was actually fine, the main issue was trapped air interfering with proper hydraulic pressure. This is a serious safety concern that needs immediate attention. Reduced brake performance can lead to dangerous situations, especially at higher speeds or emergency braking scenarios. The repair process involves connecting diagnostic tools to clear error codes, pressure testing the entire system, and performing a complete brake fluid flush with proper bleeding sequence. Once properly fixed, the brake pedal should feel firm and consistent.

Thanks for sharing those details about the brake system bleeding. The same issue got fixed on my A6 last month. The vehicle safety was definitely compromised with those symptoms. My brake pedal is now firm and responsive after getting it properly diagnosed and fixed. Could you share how much you paid for the complete brake fluid flush and system bleed? Also wondering if any other replacement parts were needed in your case? Just want to compare costs since these brake-related repairs can vary quite a bit. My ABS module has been working perfectly since the repair, but I keep monitoring for any warning lights just to be safe.

Good to hear your brake system was fixed successfully. In my case, the repair was straightforward, the brake booster pressure sensor failure was resolved through proper bleeding of the hydraulic brakes. The total cost came to 90 Euro for labor and fresh brake fluid. No replacement parts were needed as the diagnostic testing confirmed the ABS system components were functioning correctly. The issue was purely due to trapped air affecting pressure readings. The repair shop used specialized equipment to ensure complete air removal from all brake lines. Your approach to monitoring the warning lights is smart. A properly maintained brake system should provide consistent pedal feel without triggering any alerts. The key was getting an experienced technician who understood the correct bleeding sequence for these specific brake systems.

I finally got my A6 fixed last week after dealing with those brake issues. The mechanic performed a full system diagnosis using proper diagnostic tools and found air trapped in the hydraulic brakes, just like you mentioned. The total repair cost was 120 Euro including fresh brake fluid and labor. The vehicle safety has improved dramatically, my brake pedal is now firm and responsive. No replacement parts were needed since the pressure sensor and other components tested fine. The mechanic used professional bleeding equipment to ensure all air bubbles were completely removed from the system. After a week of regular driving, no warning lights have appeared and the braking performance remains solid. Getting this fixed by a qualified technician who knew the proper bleeding procedure was definitely worth it.