Before you can supply air to the air tanks of a second trailer you need to:

Question

Accepted Answer

A: Open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of the second trailer.. First, open the shut-off valves at the rear of the first trailer. Second, close the shut-off valves at the rear of the second trailer.

Before you can supply air to the air tanks of a second trailer you need to:

Colorado CDL Doubles/Triples Test Info