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      04-01-2020, 03:30 AM   #2
spudulike
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Drives: BMW 330i (2006)
Join Date: Aug 2018
Location: Gloucester

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Is the vibration coming through the steering wheel or the seat? That'll tell you which end the problem is.

It sounds like you're talking about the slide pins which allow the caliper to float. You don't need to remove them to get the caliper off but it can be a good idea to replace them if they're pitted or blackened.
I recently replaced mine- I had to use an extension to get the force necessary. After 117000 miles mine were actually slightly curved!

It sounds like yours are in good shape if you can move the caliper freely, as that's what the slide pins are there to do.

To get the caliper off you just need to remove the caliper hanger IIRC these are two 16mm bolts.