i recently change my front rotor myself like a month ago. every thing gone smooth, but the passed couple of weeks something is going on under my front driver side. notice a clunk noise (LIKE SOMETHING LOSE) when driving slow and hit small bump and the same for the big bump. like at 5 to 10 mph. but when on the hight speed (50MPH AND UP) i hit the pump it doesn't have any clunk sound. the car driver smooth and wheels turn fine. and other thing i notice is my vsa. normal it would do auto vsa check every time you would start your car and begin to drive and it doesn't have that sound anymore. is it part of the vsa module begining to fail? i only check what under the car for any lose parts but didn't see anything. try to move my caliper, but its mounted pretty tite. i have not check for any other mechanical failure yet. just wonder if anyone have the same issue? and what to look for?

PS: sorry for the english. its not my first language.