Yamaha 2009 WR250R Owner's Manual page 51

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