2007-2009 Honda TRX300EX TRX300X service manual, Page 284Get this manual
HYDRAULIC DISC BRAKE Check the fluid level in the master cylinder reservoir as this operation causes the fluid level to rise
Push the caliper piston all the way to allow installation of new brake padsPull the pad pins out of the caliper while pushing in the pads against the pad springRemove the brake pads with the shimClean the inside of the caliper especially around the caliper piston
Make sure the pad Install the pad shim onto new brake pad as shownspring is installed Install new pads into the caliper body with the shim correctlyfacing the pistonAlways replace the brake pads in pairs Install the pad pins by pushing in the pads against to ensure even disc the pad spring to align the pad pin holespressure