About a month or ago after switching my winter tires my mechanic recommended brakes and new hubs for the rear due to noise and rust. I also decided to replace the badly rusted and chipped brake dust shield since everything was pretty much going to be coming out. I'll try and give as much detailed info as I can.
I purchased all the brake parts and my mechanic got 2 rear hubs (Mevotech) and both OEM dust shields from Toyota as GM no longer sells them. Brakes were OEM rotors (19184534), new OEM TRW calipers (19204182 & 19204183), Bosch QuietCast pads (BC1354) new Delco slide pins (19287332) new Bushings (19308010). The caliper bracket was fine, mechanic ground off the rust and cleaned the bores. System was bled after all work was completed.
Everything felt fine for a bit but as the weather got warmer and I opened my windows I could hear a metallic rattle coming from the back on heavy bumps or uneven pavement. Thinking it was suspension, I went back to the shop. Mechanic looked it over took it for a test drive. Noise was present, then he yanked on the handbrake as the car was moving, noise disappeared whenever brakes were applied. So we went over the entire install piece by piece. Noticed caliper was slightly loose and could be moved with force. Re-tightened everything, off I went. Few days later same thing. We tried new guide pins Dorman (HW14470), caliper feels more snug but still moves slightly so the rattle is still there.
At this point, the next move is to just go with a junk yard caliper but I REALLY don't want to do that for obvious reasons. I've checked the OEM diagrams, nothing seems to be out of order. Any ideas? Is there any additional parts missing here?