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There are two schools of thought on applying lubrication to the calipers and pads, and two different products that are typically used.
I put the high temperature grease previously mentioned on the 'ears' of the pads, highlighted in yellow. There are four spots on each wheel. Then I apply it to the caliper where those ears touch the caliper, also highlighted, four spots each wheel. To do this properly you need to undo the caliper (item 1) but not the caliper bracket, and lift the caliper up, to get better access.
Others may promote (either alone or in addition) the use of a plastic compound that is applied over the back of the pads, and which sets up. I don't like to use that except as a last resort. It can squeeze out over time (at which point the noise returns), and it can reduce the firmness of your brake pedal, since it is compressible.
As a side note, make sure that the anti-rattle clip that holds the pad in place is tight, and installed properly.
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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
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