I used this tool on a 1969 VW Karmann Ghia. The front brakes are calipers, as are the bugs from that era. You do not have to remove the piston, but you must rotate it while it is in the caliper to install the caliper backing plate. This tool is very similar to the tool in the repair manual, although the image in the manual only partially shows the tool. Definitely this tool works, but it needs some modification, hence the rating is 3 stars. The quality of this instrument is "Harbor Freight"β¦