Weird noise under car

We have been experiencing some wierd noises under our 328is. One noise is when you hit the brakes hard or even moderately, you can hear a few loud clunks from the right front corner of the car. It feels like your hitting a large pothole. It doesn't happen all the time either. In a straight line the car is otherwise noise free with no bearing noise.It doesn't appear to be bearings. Had the wheels off myself. The cars suspension was inspected last summer and everything was suppose to be ok. FYI the suspension is lowered and polybushings are used. This was installed long before this noise started. Another noise, which arrived about the same time is creeking from under the passenger side firewall or rocker area which can occur anytime in stop and go traffic. The car doesn't pull either direction and everything seems ok other than the very loud noise upon braking. Input would be greatly appreciated.

Rob