One way to check for a A-arm problem is to crank your wheel all the way to the left until it stops. Watch your wheel just as it comes to the end of the travel. If you have a loose A-arm you will see it "flex" when the steering comes up against the stops. The wheel will actually tilt a little. Try this on both wheels in turning either direction. This may be your problem because you put a lot of stress on the lower A-arms when you put on the brakes. I have heard them clunk. You can also use this test to see play in the ball joints too. A visual test would be the only way to check the frame mounts. You may be able to see marks where there has been movement. Sometimes they look good but when you try to turn them they crumble. Good Luck! Jim