I had the same problem before.

my mechanic adviced me, if you're changing brakes, make sure to change the "same pair" of pads and calipers and mount (forgot the name). it could very well be like what your mechanic said - old and new part no, but your other brake parts might not be fully compatible. blame bmw for this.

i learned the hard way - brake stopped working when you really need it to work. changed the whole thing and don't change mechanic shop.

who knows really. it's a beemer. shit problems like this is common and regular for pretty much everybody.

the squeel should go away after all the rusts dah hilang. but if it doesn't, maybe realigning the brake parts like calipers might help. macam cabut pasang balik. i'm not a mechanic lah so I dunno, I'm just using PC logic lel.


last time i find that jamming the brakes hard can hilangkan the squeel sound.