1987-2003 Yamaha YFZ350 Banshee supplementary service manual, Page 193Get this manual
AIR BLEEDING
Bleed the brake system if: The system has been disassembled brake hose has been loosened or removedThe brake fluid is very lowThe brake operation is faultyA dangerous loss of braking performance may occur if the brake system is not properly bled
Air bleeding steps: Add proper brake fluid the reservoirInstall diaphragmBe careful not to spill any, fluid or allow the reservoir overflowConnect the clear plastic tube (4.5 mm, 316 in inside dia tightly to the caliper bleed screw