most lightly it's going to be the front pin thats seized..
The rear pin fits in a rubber sleeve...
On the front pin pull the little rubber boot/seal off "it's toast anyway
& will need replaceing" Then get a spanner & see if you can turn the pin
to brake it free... It should be screwed into the caliper..
Replace both rubbers...

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...