76 K5 with 44 and 12 bolt. This just started last Wednesday. When I apply the brakes, just before I come to a complete stop I hear a couple creaks. Then when I go again it creaks a couple more times. [Creak] is defined here as a metalic sound. Like something is binding then released, binding then released and veries slightly with the amount of momentum that is stopping. A friend walking next to the truck really thinks it's coming from the back. Friday when I'd hit the brakes hard the brake light would come on and the peddle would feel spongy and they'd fade. We've inspected the driveshaft and it seems fine. Both u-joints are only a couple months old. Verified the axle u-bolts were torqued to 150 lbs. We pulled the drums and noticed the flat metal flap that engages the star adjuster wheel wasn't engaging the star wheel on either side. I replaced those with new hardware put it back together but then the on the test drive the light would stay lit and the brakes were awful, plus the creak was still there. I ended up replacing the brake shoes and the wheel cylinders in hopes of solving this. The brakes are great now and the lite is off but it still does the creaking thing. I was thinking maybe it's the rear springs making the creaking noise. I have the stock springs with a superlift 2" add-a-leaf and 3.5" blocks. Anyone have this noise? Any suggestions as to what to check next?