When inspecting the air and electrical lines between the tractor and trailer, what should you look for?

AIR AND ELECTRICAL LINE INSPECTION: Check the lines connecting tractor and trailer for: AIR LINES (glad hands/hoses): not cut, cracked, worn through, or damaged; not tangled, pinched, or rubbing against moving parts; not dragging on the ground; securely connected to the correct couplers; no audible air leaks; ELECTRICAL LINE (pigtail/cord): firmly seated and locked in the socket; not cut, cracked, or with exposed wires; not dragging or tangled; PROPER ROUTING: lines should have enough slack to allow turning without stretching or disconnecting, but not so much that they drag or tangle; SECURED so they don't catch on the fifth wheel or moving parts; FUNCTION: air lines operate the trailer brakes (critical safety); the electrical line powers trailer lights, signals, and ABS; DAMAGED LINES can cause: brake failure (air leak), loss of trailer lights/signals (electrical), or a disconnection while driving; these lines are a key combination vehicle inspection item — damaged or improperly routed lines are a common violation and safety hazard; inspect every trip and watch that they don't drag or tangle during turns.