Oregon CDL Doubles & Triples: Uncoupling Doubles/Triples Test 2026

Taking a set of doubles apart safely follows its own careful order, and this uncoupling drill teaches it so nothing rolls away. You will practice securing the rear trailer, releasing the dolly from its kingpin, disconnecting the air lines and safety chains, and lowering the landing gear in the right sequence. These CDL doubles and triples uncoupling steps keep both the trailers and everyone around them safe.

The questions stress chocking wheels, supporting the trailer weight before releasing a lock, and confirming the area is clear before you pull the dolly out. Getting this order right is a standard requirement of the Oregon T-endorsement test.

Since scored question counts differ by jurisdiction, verify yours in the Oregon CDL Manual before test day. Rehearse this uncoupling procedure until it is automatic, then bring it all together with the doubles and triples practice test for your 2026 prep.

Keep going:

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

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