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Doubles/Triples Air Brake Check

Doubles/Triples Air Brake Check covers the additional air brake inspection steps a driver must perform across multiple trailers, drawn from 49 CFR 383.111(b)(3) (severed or disconnected air lines between units) and (b)(5) (pre-trip check).

Practice Doubles/Triples Air Brake Check

2 Questions

  1. While running the doubles/triples air brake check, you walk back to the last trailer, crack open its shut-off valves, and hear no air escaping from either line. What should you check?
  2. After the stationary checks, how does a driver confirm the trailer service brakes of a double or triple are connected and working?