Yamaha YJ125T Owner's Manual page 39

NOTE:
8 The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
8 Hydraulic brake system
9 When disassembling the master cylinder or caliper cylinder, always replace the brake fluid. Check the brake fluid
level regularly and fill as required.
9 Replace the oil seals on the inner parts of the master cylinder and caliper cylinder every two years.
9 Replace the brake hoses every four years or if cracked or damaged.
PERIODIC MAINTENANCE AND MINOR REPAIR
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