Lexus SC 430 2006 Owner's Manual page 218

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Adding fluid
Turn the ignition switch off.
Depress the brake pedal 40 times or more.
Remove the reservoir cap.
Add newly opened brake fluid up to the "MAX" line.
Brake fluid absorbs 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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Be careful because brake fluid can harm your hands or eyes and damage painted
surfaces.
If fluid gets in your eyes, flush your eyes with clean water immediately.
If you still experience discomfort, seek medical attention.
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 mechanical problem.
Have the system checked by your Lexus dealer.
4-3. Do-it-yourself maintenance
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