Lexus LS460 Owner's Manual page 784

756
6-3. Do-it-yourself maintenance
NOTICE

If you remove the air cleaner filter
Driving with the air cleaner filter removed may cause excessive engine
wear due to dirt in the air.

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.
LS460_EE (OM50D49E)