OK, heres the deal. Have an 08 DC still under warranty. Recently I discovered that during a normal stop, while holding the brakes, the pedal will gradually go to the floor. Well my previous Tundra did the same thing and I had to change out the master cylinder. Every vehicle I've ever had that displayed this symptom usually had a defective master cylinder. So I make an appointment at my local dealership to have the truck worked on. After explaining the problem I leave it and go home. Shorlty I get a call that my truck is ready. Then the caller tell me that there was no problem with the brakes and that this is "normal" on all Toyotas. I tell him that I can't accept that and that I will pick up the truck and contact Toyota. Then he wants me to talk to the mechanic. I talked with him on the phone and he explains that he cant duplicate the problem. I'm not too impressed because I have to explain how you start the engine and step on the big pedal and in about 15 seconds the pedal will be on the floor. Then he starts to tell me how this is normal. Anyway I explain to him that before I left the truck for work I had the parts dept order in a MC because I was sure it was a defective MC. He then says he will have to ask his manager about this. A few minutes later the adviser calls me back and says the MC is going to be replaced. Now my question is has anybody experienced this and how could this be called "normal" brakes. Why would you design a brake system for the pedal to go to the floor?