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Why do combination vehicles get a slightly higher allowable leakage rate than single vehicles?
- A.They have more tanks, longer lines, trailer valves, and gladhand connections, so a small amount of extra normal seepage is allowed
- B.Their brakes are less important at speed
- C.The compressor on combinations is weaker
- D.The limits were set lower for single vehicles by mistake
Correct answer
A. They have more tanks, longer lines, trailer valves, and gladhand connections, so a small amount of extra normal seepage is allowed
Why
More components mean more joints that can seep a trace amount even in a healthy system. The standard accounts for that hardware difference while still capping total loss tightly.
Manual topic: Air Brakes - Air Leakage and Brake Tests · From the Air Brakes practice bank (AB-086).