Brake ?
 

Have a 2015 FRS recently had a frozen caliper after a brake pads exchange. Turns out it's because of a rubber bushing on the lower slide pin so I remove the bushing for now. The upper slide pins are a solid piece with no bushing, and will fit in the lower slide pin hole. Does anyone know why the bushing is used in the lower pin chamber? Can I just buy a set of upper pins for lower chamber?