1999-2004 Honda TRX400EX FourTrax Service Manual, Page 203Get this manual
HYDRAULIC DISC BRAKE
REAR BRAKE PAD REPLACEMENT
Alwaysreplace the brake pads in pairs to ensure even discpressure
Straighten the lock plate tabs and loosen the pad pinsRemove the mounting bolts and rear brake caliper
Push the caliper piston all the way in to allow installation of new brake padsNOTE: Check the brake fluid level in the brake reservoir as this operation causes the level to risePull the pad pins out of the caliper body with the lock plate while pushing in the pads against the pad springRemove the brake pads