Clunk in Reverse

I have a problem only after a cold start and I'm in reverse, to get out of a parking spot. I start the car, put it in reverse, apply the brakes and CLUNK! This only happens on a cold start, and it only happens when in reverse. I'm not slamming on the brakes or anything, just lightly applying them. Also, this doesn't always happen. Somedays it will after a cold start, somedays it will not. Brake pads? ? Thanks in advance

is the sound coming form the front or the back brakes? If the fronts maybe the slide bolts, if the backs possibly a shoe is off the anchor pin. I had an old pontiac 6000 with a similar problem, changed the springs and religned everything inside the drums and it worked. Any help? Let me know how it goes.

grand prixs dont have rear drum brakes... have been all discs since 1988 i believe

Did you checked the tranny mounts? My Z-34 has worn mounts and sometimes the clunk comes when accelerating of breaking

The problem is coming from a gasket that pieces two parts of the exhaust together. When the exhaust heats up and expands the connection is tight, so the clunk goes away. Annoying, but not a major problem. I had the dealer replace the gasket under warranty, once I discovered the problem, but it can be done easily by anybody. I can't remember now which two pieces it joined, it has been a long time.