general problems of the 2014 Audi A6

I am writing to formally file a complaint regarding persistent mechanical failures and safety concerns with my 2014 Audi A6, VIN: [xxx] , which have resulted in significant repair expenses, inconvenience, and potential safety hazards. Despite having the front brakes and sensors replaced in the previous year, I recently experienced brake warning lights and related malfunctions. According to the most recent service report from Audi bethesda (repair order [xxx], dated may 9, 2025), it was discovered that the incorrect brake pad sensor had previously been installed and that connectors were not properly secured. Additionally, the repair team found further issues with the abs sensor and rear brake pad sensors—indicating an ongoing pattern of misdiagnosis and improper installation by authorized service providers. More concerning is the failure of the vehicle’s fuel system, including the fuel pump and filter, which were replaced at considerable expense. According to the repair documentation, there were still unresolved low fuel pressure faults present even after parts replacement. The technicians cited potential metal contamination in the fuel meter valve (n290), which could require full fuel system replacement—an unacceptable situation for a vehicle that has already undergone such costly repairs. After further internal investigation by mitch carr’s auto service several other concerns were brought to my attention. 1)battery left to die 2)fuel filter replaced 3)glow plug replaced 4)injector seal replaced 5)re-gen dpf procedure to clear faults 6) rubber stem on tire replaced information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

All four brakes rotors were warped at 37k and had them replaced. Now the dealership is telling me the front ones are warped again after 12k miles. Car vibrates when you brake.

A few times when slowly gliding to a stop (red light or stop sign) when stepping on the brake pedal it seems to go to the floor and needs to be pumped in order to stop. It's a scary situation. I cannot make it happen. It didn't seem to happen until I had the brake fluid changed during routine maintenance at Audi. I reported the problem to dealer where the work was done and they said that they redid the fluid change but the problem has re-occurred a couple of times. Also, it seems that when sitting in the car with it idling I can just about press the brake pedal to the floor.