I have a 93 Civic Si h/b. I noticed last night when I was driving coming home and braking I could hear something vibrating from what sounds like the rear of the car. I thought it was coming from the caliper or something but I looked at it and it seemed fine. Could anyone tell me what vibration coming from the back may possibly be?

 

If you've got a mechanic friend then borrow their ChasisEars and listen through the headseat to see where its coming from. Disassembly would probably be a better idea if you can't pick up on anything visually. Jack up the car and try to wiggle the tire left/right & up/down to see if you've got some play on a part. Good luck.