2009 Toyota FJ Cruiser Owners Manual - Page 314

4-3. Do-it-yourself maintenance NOTICE n 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 compartment. n 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. 288