Yamaha Majesty YP400X Owner's Manual page 49

NOTE:
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The air filters and V-belt filter need more frequent service if you are riding in unusually wet or dusty areas.
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Hydraulic brake service
After disassembling the brake master cylinders and calipers, always change the fluid. Regularly check the brake fluid
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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
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fluid.
Replace the brake hoses every four years and if cracked or damaged.
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PERIODIC MAINTENANCE AND MINOR REPAIR
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