KTM 450 SX 2009 Owner's Manual page 118

MAINTENANCE ON CHASSIS AND ENGINE
Warning
Danger of accidents Reduced braking due to old brake fluid.
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Have the front and rear brake fluid replaced according to the service plan in an authorized KTM workshop.
Warning
Environmental hazard Problem materials cause environmental damage.
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Dispose of oil, grease, filters, fuel, cleaning substances, brake fluid, batteries, etc. according to regulations.
Info
Never user DOT 5 brake fluid! This is based on silicone oil and is colored purple. Oil seals and brake lines are not designed for
DOT 5 brake fluid.
Avoid contact between brake fluid and painted parts. Brake fluid attacks paint!
Use only clean brake fluid from a sealed container!
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Remove screw
100049-10
with membrane .
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116