Frenkit Rear Caliper Seal and Piston Kit BREMBO 629020 for BMW Frenkit Frenkit 629020: rear caliper seal and piston kit. See if it fits your bike. BMW R 1100 GS BMW R 1100 R BMW R 1100 RT BMW R 1100 S BMW R 1150 GS BMW R 1150 R BMW R 1150 RS BMW R 1150 RT BMW R 1200 C BMW R 850 C BMW R 850 GS BMW R 850 R