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I rebuilt some calipers a fewe years ago, not BMW, and a easy way to get the boot over the piston is to use some low pressure are into the hose connection. As you hold and press the piston on the caliper it will blow the boot over the piston. Then fit the piston into the caliper through the seal and put the boot into the piston groove. Use very low pressure. Don't want to push the piston out.
ML
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