hi- just purchased a 2006 GX 470 (31k miles) Monday. Driving home today noticed that as i would brake the pedal would stair step down to the floor. If i released the brake and resumed braking the stair step would in effect stop. I drove the car into the local Lexus service shop. They didnt have a real explanation. Did ask if there was grinding--which there wasn't--the car was state inspected on Monday(no brake issues). There were no warning lights on (abs etc etc).Lexus was very accomodating and said they would have their techs check it out tomorrow. I will post their findings asap--just curious if anyone has experienced this before ? thanks, Shawn
