brake life is dependent on many things, type of pad for one. Ceramic are pretty good ones. It also depends if you are a heavy footed/left foot brake person, any mechanic will be ableto tell by wear on lh side of brake pedal. If you are getting vibration on rotors its pulsation form getting out of round, usually by repeated heavy stops or riding the brake. You could also have calipers that are frozen or not sliding well on mounting. A mechanic can tell by one side or the other of pad being worn. All brake pads manufactured in u.s. have ratings on them like EF or FF the higher the alphabet the better they stop cold or hot.. I think the ratingnow goes to HH, but ceramics are normally FF.