Yamaha YQ50 Service Manual page 31

INSP
ADJ
PERIODIC MAINTENANCE/LUBRICATION INTERVALS
NOTE:
Brake fluid replacement:
1.When disassembling the master cylinder or caliper cylinder, replace the brake fluid. Normally check
the brake fluid level and add fluid as required.
2.On the inner parts of the master cylinder and caliper cylinder, replace the oil seals every two years.
3.Replace the brake hoses every four years, or when cracked or damaged.
3-2