You should take it to a shop and let them fix it. Tell them what you have done so far, and let them take it from there.

Whereas your brakes may benefit from bleeding, you should not do it IMO.

__________________
2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue