Your question is indeed tricky - the fault will be rediculessly obvious when located -
Note BMW "sickness" such as:
- oil leaking into the shaft from the gearbox.
- oil leaking into shaft from the bevelbox => lose nut => bevel about to get really badly damage.
In a way you kind of describe what happened to my 32/10 bevel - the bevel part connecting to the shaft suffered one bad ballbearing causing excessive travel. It was seen only as a bit more metal on the magnet than could be expected. My mechanic said I was over concerned... I drove -many- miles with a really bad bevel... broke some teeth... and what prompted me to check was that backing the bike became weird.
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If I had not used Omega 690 80W/90 the bevel would have jammed for me... the oil was still in very good shape after 40-45 000km incl the "broken" ballbearing(!) - point, change oil to look at the magnet(!) every 5-8000km or there about = very cheap "insurance".
Check you disc-brake. Check that you did install all parts correctly and bleeded the caliper fully. A warped disc / worn-out (common BMW sickness) could cause the sounds (but that kind of requires you to have touched the brake-pedal...).
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Drive Safely,
Albert
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