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Turns out that I have a play on the rod that turns the wheels, the rods that have some rubber shield about 6 inches in lenght protecting them; tie rod maybe? In the Hayne's manual for the 320i, it's the predominant rod with the rubber sheild that looks like an accordian on Fig 11.3 page 172. Futhermore, there's play only on the side I experience the knocks and no play on the other side.
This might explain the knocks during breaking, but what explains the knock over bumps? That I still have to figure out.
Klaus, 81 e21 iS
In Search of why e21 shimmer