Arkansas CDL Doubles & Triples: Air Brakes Test 2026

Pulling doubles or triples adds air brake shut-off valves that a single trailer never needed, and this Arkansas CDL doubles and triples air brake shut-off test makes them clear for 2026. At the rear of each trailer except the last, the service and supply glad hands must be closed off with shut-off valves, sometimes called cut-out cocks, so air is not lost out the open back of the final trailer.

This doubles and triples drill drives home a critical habit: the shut-off valves on the very last trailer must be open, while those between trailers must be closed. Get this backward and the trailer brakes will not work as expected, a mistake the T endorsement exam is designed to catch.

The number of doubles and triples questions is set by Arkansas, so check your Arkansas CDL Manual for the exact figure. Learn the shut-off valve logic until it is automatic, and this part of the Arkansas DFA - Driver Services test becomes easy points.

Keep going:

• Arkansas Doubles and Triples Practice Test
• Arkansas Doubles and Triples Practice Test 2
• Arkansas Doubles and Triples Endorsement Test
• Arkansas CDL Practice Test
• Arkansas Air Brakes Practice Test
• Arkansas CDL Combination Practice Test
• Arkansas CDL Pre-Trip Inspection Practice Test
• Arkansas Hazmat Practice Test
• Arkansas CDL Practice Test

Every question traces back to the Arkansas CDL Manual - skim the right-of-way and signs chapters before your retake.