California CDL Combination Vehicles: Uncoupling Test 2026

Uncoupling is coupling in reverse, and skipping a step here is how trailers end up on the ground. This California CDL uncoupling test for 2026 runs the full order: park on solid level ground, ease the tractor slightly under the trailer to relieve pressure on the locking jaws, set the parking brakes, then lower the landing gear until it just touches and take up the slack.

From there the CDL combination uncoupling practice test covers disconnecting and securing the air lines and electrical cord, pulling the fifth wheel release handle, easing the tractor forward until it clears the trailer apron, and only then pulling completely clear. It also asks about soft ground, sloped lots and what happens when landing gear is lowered onto asphalt in summer heat.

Your California CDL Manual lays out the same sequence and is where California DMV publishes the number of questions on the combination vehicles exam, so verify that count before you test.

Keep going:

• California CDL Combination Practice Test
• California CDL Combination Practice Test 2
• California CDL Combination Practice Test 3
• California CDL Combination Vehicles Test
• California CDL Practice Test
• California Air Brakes Practice Test
• California CDL Pre-Trip Inspection Practice Test
• California Hazmat Practice Test
• California Class A CDL Practice Test
• California CDL Practice Test

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