I don't think it is at all likely that this is your problem.

I wouldn't replace the guide pins unless they were obviously worn, and the caliper was moving. If they are seized up, you will have uneven pad wear, that is the tell tale.

Make sure you don't lube them, they are designed to be dry.

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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
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