hi guys havent posted much due to the fact i have had nothing wrong with my vectra c 2.0dti
but today i jet washed my motor paying more attention to my alloy wheels then as i was driving away i have a knocking sound coming from the front
i know it must have something to do with the wheels as it gets faster when i speed up and the lower the speed the banging slows down but gets louder also slight clunks in reverse or when i brake

i have no lights or warnings to indicate a problem
also no knocking or rattles when car is stationairy

my friend suggested the brake caliper guard is bent but thats aluminium and the bangs are a lot louder hope he's right

any way please help