over the weekend i went on long trip 400 miles each way. and noticed some brake problems. car 2005 g6 gt. 48,000 miles. at speeds over 60 mph if i got on the brakes somewhat aggressively. i had a bad shutter like feeling on pedal. have done some research here i guess the rotors wear out alot. could be the problem. but my other problem that when i use the brakes it now seems like the brake pedal is soft. the pedal goes down way to far when i use the brakes. it goes almost to the floor. can anyone shine some light on this problem. could it be related to the rotors needing replace also????