tweeter static

I have a focal PS 130V components running 3-way active on a DEH 80prs powered by a zapco ST-4XP 4 channel amp. I keep getting static in the tweeters only when I put my brakes on faster then normal. If I slow to a stop they don't have any distortion. What could be causing this I thought maybe some wires were loose behind the receiver but when I looked I didn't see anything abnormal.