Clunk noise, underneath car while braking Options

[Coligion]

I've been having this problem for as long as I've owned the car. When I put the car in reverse, back up, and then go to first gear and the next instance I brake I hear a loud, clunk noise from underneath (pretty sure it's the rear). After the initial clunk has been made, the noise is gone no matter when I brake--as long as I stay in gears 1 through 5. If I go back into reverse and repeat what I said above, I can repeat the noise everytime; however, it appears to be louder on cold-start. I have no idea how to diagnose the problem. My only thought was possibly sway-bar bushings? The front bar/bushings have been replaced with a Suspension Technique bar, but the rear remains stock. I jacked up the car this evening to have a look at the rear bushing and they don't appear to have any damage on them. Any help is appreciated.

This post has been edited by Coligion: Sep 9, 2008 - 9:38 PM

[Nial]

Its the brake pads shifting within the callipers...mine does it aswell, I dont know about the other models of celica, but the calipers on the faff have a spring clip on them which force the pads against the caliper so that when you brake it dosnt move....trouble is when you go backwards the rotation of the disc is fighting against this spring so that it clunks. If your calliper dosnt have this spring clip (Some may not have one at all) then every time you change direction forwards/backwards when the brakes grip the disc they are going to move in the same direction as the disc until they hit something that stops them.....obviously this is the other side of the calliper. (the movement may only be a fraction of an inch) If your always going forwards then obviously the the pads are already located within the caliper where they need to be without clunking.
Dont know if there is a cure for this or not....possibly a spring clip you can buy.

Hope all that makes sense.