See also:

Brake fluid
WARNING Over a period of time, the brake fluid absorbs moisture from the air; this lowers its boiling point. If the boiling point of the brake fluid is too low, vapor pockets may form in the ...

Servicing the brakes
If the red brake warning lamp lights up in the instrument cluster and you hear a warning tone while the engine is running, the brake fluid level may be too low. Observe additional warning ...

Checklist before driving off-road
– Engine oil level: check the engine oil and add oil if necessary. When driving on steep gradients, the oil level must be sufficiently high to ensure a correct oil supply in the vehicle. – DEF ...