Wow, sorry to hear you're having problems with your dealer. I went through a similar experience in NYC before I moved here to DC. I had a flat from a huge screw in my tire, got it replaced with a new, matching tire, and started to feel a pronounced shudder when braking, along with wandering whenever I was on the highway. I went to my dealer to get an alignment, with relative change to the condition of the car. I brought my car back, only to find out that when I brought my car in for its 30K service, the techs didn't mention that my rotors were warped. Because of that, they replaced them free of charge, a rarity for any dealer operating in the Tri-State area.