Yamaha XMax YP400RXMAx YP400RA Owner's Manual page 50

PERIODIC MAINTENANCE AND ADJUSTMENT
 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.
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