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Message: <blockquote data-quote="Marky Dissod" data-source="post: 28007" data-attributes="member: 13218">No, that's the GMTT1xx front brake update-upgrade. You confused yself.GMTT1xx 4-piston-caliper update-upgrade tends to need 2019 or later wheels; very few 'older' GM wheels work without removing excess caliper casting material.It also requires washers to center the caliper on the rotor for GMT800s or GMT900s.GMT900 front brake update-upgrade for GMT800 is FAR simpler: 2010 caliper brackets, calipers, rotors, & pads, + 17" GMT800 or GMT900 wheels, reuse brake lines =DONE.</blockquote>