Which brake hoses and tubes are the most prone to damage?
- Those that are larger
- Those that are coloured
- Those that are hidden
- Those that are exposed ✓
Answer: D. Those that are exposed
The brake hoses and tubes that are most prone to damage are those that are exposed.
Why this is the answer
The handbook describes air lines mounted against the frame and structural parts, then contrasts them with exposed lines, saying the exposed ones are more likely to be damaged. It also explains that a hose or tube has an outer protective layer, reinforcing layers and an inner air-tight layer. Damage to the outer layer can progress inward and create an air leak. That is why the exposed ones are the answer.
Why the other answers are wrong
- A. Those that are larger — The passages say each hose and tube must be the correct size and type, but they do not say larger hoses are more prone to damage.
- B. Those that are coloured — Colour is mentioned as a material or industry code and as a possible wear indicator in some cases, not as a reason a hose is more easily damaged.
- C. Those that are hidden — The passage contrasts lines set against the frame with exposed ones and names the exposed lines as more likely to be damaged, so being hidden is not the stated risk.
Remember it
Picture the air lines out in the open: those are the ones that collect scrapes and wear.