Hi I am new at this. But I bought my IS200 in Feb and the knocking noise started from the front a couple of months later. Took it to my local garage/mate he diagnosed the pin that holds the floating part of the caliper in place. The noise is a metalic clunking sound when you first touch the breaks and going over a bump in the road. He didn't fit the pin but said it was the calipers, I thought it was the caliper springs as I had a similar problem on a Ford years ago. Anyway the calipers didn't change it, so they were returned and the originals fitted (as they were expensive...). However the noise stopped for a few days and I asked what he had done, just plenty of grease was the answer. I then decided on disc and pads, no difference, I then fitted new caliper springs (small ones that hold pads apart) nothing... Going on a bit now, anyway after reading a forum reply from 2003 it apears that a special grease (white in colour) from Toyota/Lexus is needed on the mating faces of the caliper pistons and pads and lugs that the pads are held in by. This is my next fix at the weekend, I will post the results. The reason for this long reply, is hold on spending anymore money, as I already have... it may just be the grease......
