Yamaha FZ1 Owner's Manual page 49

NOTE:
From 24000 mi (37000 km) or 36 months, repeat the maintenance intervals starting from 8000 mi (13000 km) or 12 months.
NOTE:
G
The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
G Hydraulic brake service
• After disassembling the brake master cylinders and calipers, always change the fluid. Regularly check the brake fluid
levels and fill the reservoirs as required.
• Every two years replace the internal components of the brake master cylinders and calipers, and change the brake
fluid.
• Replace the brake hoses every four years and if cracked or damaged.
PERIODIC MAINTENANCE AND MINOR REPAIR
6-8
EAU17630
6