Hi, I have a GS300 2006 with 80k miles on the clock. Recently, I have experienced acceleration problems and was advised by a Lexus dealer that the rear brake callipers had seized. I have got the problem fixed by an independent garage (JEM). This is resolved the problem to some extent but the car still does not accelerate as fast as it used to. I feel as if the car takes a while to go beyond the second gear. Any suggestions to remedy the issue? Many thanks !