How can i remove the brake calipers from my vauxhall vectra?

I have tried to remove the calipers, in order to get access to the front wheel bearings that need replacing. Used a star key and other tools but no luck. Vehicle is a Treg 16 valve 1.8
Michael Clarke, August 2005
Calipers are secured to the wheel hub by means of 2 bolts which have plastic dust cap covers. You will need an allen key to remove the bolts

GC, September 2005
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