How is a cracked engine vacuum hose identified visually?

• A. A hose being extremely flexible.
• B. Cracks, splits, or hardened areas on the hose.
• C. A hose length longer than standard.
• D. A hose color matches engine paint.

Answer: (B)

Visual wear on a vacuum hose shows up as visible damage on the hose surface. These hoses age from heat and exposure to oils, so the most telling sign is cracks, splits, or hardened areas in the material. Cracks and splits indicate the rubber has become brittle and is losing its flexibility, which can create vacuum leaks and affect engine performance. Hardened patches show the material has degraded and stiffened over time. The other ideas—being extremely flexible, being longer than standard, or matching engine paint—don’t reflect actual damage to the hose’s wall and aren’t reliable indicators of a crack.