TOYOTA 2012 Tacoma - Manual (Page 420)

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4-3. Do-it-yourself maintenance
Battery
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Battery exterior
Make sure that the battery terminals are not corroded and that
there are no loose connections, cracks, or loose clamps.
Terminals
Hold-down clamp
CAUTION
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Checking the fluid level
Take care, as the reservoir may be hot.
NOTICE
■
When adding fluid
Avoid overfilling, or the power steering may be damaged.
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After replacing the reservoir cap
Check the steering box case, vane pump and hose connections for leaks or
damage.