Toyota 2009 4runner Owner's Manual page 395

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If you remove the air cleaner

Driving with the air cleaner removed may cause excessive engine wear due

to dirt in the air. Also a backfire could cause a fire in the engine compart-

If the fluid level is low or high

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.

4-3. Do-it-yourself maintenance