Banging noise in front end

Greyghost wrote:
I had a very similar issue on a 93 P30. The backing plate on the left front brake was loose. The bolts that secure it were missing. I had to pull the wheel to see the problem. If you can't pull the wheel, crawl underneath and hit the plate with a wrench or something. If it's loose you'll know it.

By backing plate, are you referring to the small plate that is held in place by a allen bolt? This has a convex spring that that goes on top of the plate that removes the gap on the lower slide. My caliper was very loose and I thought this was causing the banging noise because when I applied the brakes and hit the pot hole the noise went away. Or are you referring to the stamped metal plate that covers the brake assembly and prevent stones or water from getting in, and is held in place by 4 bolts?