Yamaha TT-R230Y Owner's Manual page 35

TIP
The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
Hydraulic brake service.
Regularly check and, if necessary, correct the brake fluid level.
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 ADJUSTMENT
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