2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 407Get this manual
HYDRAULIC BRAKE Perform air bleeding for the other side bleed valveAfter bleeding air, operate the front brake leverIf it still feels spongy, bleed the system againFill the front master cylinder reservoir to the casting ledge with DOT brake fluid from sealed containerInstall the diaphragm, set plate and reservoir cap, and tighten the screwsTORQUE: (0.2 kgf-m, 1.4 Ibfft) CASTING LEDGE
REAR BRAKE
Close the rear brake caliper bleed valveFill the rear brake reservoir with DOT brake fluid from sealed containerFollow the manufacturer's Connect commercially available brake bleeder to operating the bleed valveinstructions
Operate the brake bleeder and loosen the bleed valveIf an automatic refill system is not used, add fluid when the fluid level in the reservoir is low