2006-2009 Honda TRX250EX/TRX250X Service Manual, Page 273Get this manual
BRAKE SYSTEM If brake bleeder is not available, use the following procedure:
Pump up the system pressure with the front brake lever until the lever resistance is felt
Connect bleed hose to the front brake caliper bleed valve and bleed the system as follows:
Do nor release the brake lever untilhe bleed valve has been closed
1Squeeze the brake lever all the way and loosen the bleed valve 12 of turnWait several seconds and then dose the bleed valve2Release the brake lever slowly and wait several seconds after it reaches the end of ils travel3Repeat the steps and until there are no air bubbles in the bleed hoseTighten the bleed valve