Yamaha WOLVERINE X2 Owner's Manual page 125

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 Some maintenance items need more frequent service if you drive in unusually wet, dusty, san-
dy or muddy areas, or at full throttle.
 Hydraulic brake service
• Regularly check and, if necessary, correct the brake fluid level.
• Every two years replace the internal components of the brake master cylinder and calipers,
and change the brake fluid.
• Replace the brake hoses every four years and if cracked or damaged.
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