I have an 08 Toyota Sienna and yesterday I started to notice a very slight grinding or rubbing sound when I apply the brakes coming from the passenger side front wheel. I can only hear the grinding or rubbing sound when I am going very slowly (like the last 20 feet when approaching a stop sign). The sound pulses slightly like two surfaces that are not parrell are rubbing. There is no pulsation or wobble felt in the brake pedal. Any suggestions? I'm thinking it's time to get the rotors turned, but it could also be the brake pads.