Slapping sound when applying brakes. What could cause this? on 2008 Suzuki Grand Vitara

Recently installed new front brake pads. Now after driving a few miles, when applying brakes, there is a "slapping" type of sound. Noise seems to come from driver side front wheel area. What is the cause?

Asked by for the 2008 Suzuki Grand Vitara
Couple of possibles. The rotor is warped and needs replaced. A brake caliper mounting bracket bolt is coming loose (if you removed it) or the brakeware clips are damaged or missing. Good luck!!!