2006 Honda TRX680 Rincon Factory Service Manual, Page 425Get this manual
BRAKE SYSTEM Remove the bracket pin, boot and pad springs from the caliper bracketRemove the caliper pin and boot from the caliper bodyBRACKET PIN AND BOOT PAD SPRINGS
CALIPER PIN AND BOOT Place shop towel over the pistonDo not use high Position the caliper body with the piston down and pressure air or bring apply small squirts of air pressure to the fluid inlet the nozzle too close to remove the pistonto the inletR theton boot