I recently replaced both front wheel bearings on my 03 E39 525i - approximately 107k miles. Since replacement I get a "knock" when braking at low speed. Almost as if there was a hard spot in rotor or a stone embedded in a pad. The knock does NOT occur at speeds above 8 - 10 mph I double checked that the strut was aligned after the bearing replacement, I have double checked all mounting bolts. I have replaced the following trying to rectify: Caliper slide bushings and pins Rotors Pads It seems to be just the left front. There is NO high speed shimmy or shake and no issues when braking at speed. Any suggestions are welcome.