What is the most distinct and permanent feature used to identify long-stroke brake chambers?
- The square ports ✓
- The red markings
- The manufacturer's details
- The size of the brake chamber
Answer: A. The square ports
The most distinct and permanent feature is the square ports: long-stroke brake chambers have square air-line ports, while standard chambers have round ports.
Why this is the answer
The handbook lists visible clues for long-stroke chambers: the air lines attach to a square port, a trapezoidal tag sits under the clamp bolt, and markings on the chamber body show it is long-stroke. It then singles out the square ports as the most visible and permanent identifier. The passages also contrast them with standard chambers, which have round ports. That direct contrast is what makes the square port the feature to look for when identifying a long-stroke chamber.
Why the other answers are wrong
- B. The red markings — The passages do not describe red markings as an identifier; the listed clues are square ports, a trapezoidal tag and body markings.
- C. The manufacturer's details — Manufacturer's details are not listed among the visible features used to identify a long-stroke chamber in the passages.
- D. The size of the brake chamber — Chamber size is something you identify to find the adjustment limit, but the passages do not say size alone tells you it is long-stroke; the type is a separate thing to identify.
Remember it
Square port, long-stroke; round port, standard.