When i brake hard i get a wierd sound

Tried to listen for it but...

k well i went ahead and looked at the rear brakes. the pads seem a little glossy. im not to sure what that means, but thats what it is. also i braked hard a few times (i kno that makes so sense, but you know what i mean) and i listened for the sound more closely. it sounds wierd, but it sounds as if something is hitting my mufflers. one of my mufflers is 1/2" or less away from my driveshaft. im not sure if its even possible, but i have no clue :shrug: . it also made a similar sound when pulling a uturn in a parking lot. that time it sounded like a tie rod, or my new wheels rubbing on something. ill get the car back on stands and look at it. can someone tell me what my brakes should look like when they need to be changed. (the rear drums).

.........its always somethin :bang: :bang:

thanx