The hoses in your vehicle are the links between many vital areas. These pieces of tubing are responsible for the transport of anti-freeze, brake fluid, power steering fluid and vacuum pressure, just to name a few. Because of their importance, and the environment with which they exist, routine inspection is recommended.
Because the materials used to construct hosing are as numerous as the length and width of the automotive hoses available, the potential lifespan of a hose varies greatly. Also, temperature and degree of pressure effect hose life.
Inspection of hosing is as simple as a squeeze. Plastic hose, like that used in vacuum systems, should be hard but not brittle. Breather hose should be soft, but not cracked. At no time, should a hose be damp, as if fluid was soaking through. If there is a question about the condition of a hose, be safe, and replace it.
When inspecting your hoses, take the time to also check the connectors (elbow, right angle, t-fitting, etc.) between many of these hoses. They are as important as the hose, and are effected by many of the same elements as hosing.