I have a 2011 G37xS sedan. I have been noticing the above 40mph when I brake there is a big of vibration, feel it in the seat and steering wheel. I had installed Centric rotors (front/back) back in July 2017 along with new pads and did the whole bedding process. I drive about 15 miles a day. I kept reading it is probably not warped rotors but pad deposit. I went ahead and tried to clean them out by doing several 60mph down to 10mph braking with no luck. Just few days ago I went ahead and replaced all the pads with new pads and bed them in. It still feels the same, great stopping power but not smooth. Anything else I can do other than replace 4 rotors again?

 

Seems one of your pistons in the caliper is binding. Buy rebuild kit for seals

 

Why do you think it is a caliper that is binding? Even if that is the case, is there any way of knowing or does one just rebuild all the calipers? I have done the passenger rear before but it is not a hard job.

 

New pads and rotors warping usually is caused by piston seal going bad

 

Warped rotors can also be caused by not torqueing the lug nuts on your wheels to spec.

 

I would check the torque of all the lug nuts. I will admit I have been using an electric impact gun to tighter the wheels.

 

Solution was to replace the rotors. I purchased 4 new rotors from RockAuto. I went with coated Raybestos rotors, came to about $108 and they are coated and should not rust.

 

There was nothing wrong with your rotors that an Italian tune-up wouldn't have fixed. For free.