Two weeks ago I posted a thread on the fact my 87' 205GTi had 11mm thick front discs, not the 20.5mm ventilated discs that every other 205GTI came out with. I was scratching my head trying to work out WHY. Today we were trying to see if the calipers and discs off a 405 would fit. Once we removed the disc on one side we noticed how far the piston was sticking out of the caliper, we took out the pads and pushed the piston back in, fitted the new 20.5mm disc and put the pads back in, put the caliper and the pads back onto the new disc and guess what?????. they fitted perfectly. SOME IDIOT HAD REPLACED THE ORIGINAL WORN 20.5mm DISCS WITH THE 11mm DISCS USED ON THE 205SI. Just imagine what would have happened once the pads had worn out!!!!. Them and the pistons could have easily fallen out of the caliper. I should have listened to Peter T when he said " someone has fitted shitty brakes to your GTI". I COULD HAVE BEEN KILLED!!!!!! Maxie.