2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 416Get this manual
HYDRAULIC BRAKE Place shop towel over the pistonsDo not use high Position the caliper body with the pistons down and pressure air or bring apply small squirts of air pressure to the fluid inlet the nozzle too close to remove the pistonsto the inlet
Be careful not to Push the dust and piston seals in and lift them outsMng surfacet Clean the seal grooves, caliper cylinders and piswJth c|ean brgked