Rattle in Rear when slowing down

I just developed a noise coming for the rear when I slow down. Any Ideas? Im sure the rear brakes are proably shot. They are the stock im sure at 71K. I am going to replace them soon. Exhaust pipe ratting??!?! I had this noise before my question below happend.

Also any know if driveing a 5 speed though a huge puddle becuase it was raining would damage anything seems like after that its harder to get in gear. Can the clutch get wet?
 
Same as above. Look for any shiny spots, like on the front of the exhaust system (where braking force would push it), or inside the drum / brake area. Could your exhaust be hitting the driveshaft, etc. ? Check the bolts on your backing plates ans make sure they are tight.