For brake drag generally all you have to do is just pick up some brake caliper grease, and wire brush and lube the two slide pins. You can usually go for a drive and when you stop put your hand on the calipers and feel if one is hotter than the next. The hot one is the culprit. It is still a good idea to lube the slide pins frequently anyways as general maintenance, and it's pretty easy to do for the novice DIYer
Unless they are rusted stuck or the no one has changed the brake fluid in ages, and rusted the caliper pistons. That takes years of neglect so don't worry about that too much with the xb
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