Lexus IS F 2012 Owner's Manual page 405

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Adding fluid
Make sure to check the fluid type and prepare the necessary items.
Fluid type
Items
Brake fluid can absorb moisture from the air
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Excess moisture in the fluid can cause a dangerous loss of braking efficiency. Use
only newly opened brake fluid.
CAUTION
When filling the reservoir
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Take care because brake fluid can harm your hands or eyes and damage painted
surfaces.
If fluid gets on your hands or in your eyes, flush the affected area with clean water
immediately.
If you still experience discomfort, see a doctor.
NOTICE
If the fluid level is low or high
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It is normal for the brake fluid level to go down slightly as the brake pads wear or
when the fluid level in the accumulator is high.
If the reservoir needs frequent refilling, it may indicate a serious problem.
FMVSS No.116 DOT 3 or SAE J1703 brake fluid
Clean funnel
4-3. Do-it-yourself maintenance
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