Arkansas CDL Combination Vehicles Test common mistakes
Arkansas CDL Combination Vehicles Test · Understand the traps and how to avoid them.
Rolling through a stop or slowing without a full stop while pulling a loaded trailer, treating the stop as optional because the rig 'feels slow enough'.
Candidates carry over light-vehicle habits and underestimate how much longer a loaded combination takes to shed speed; the cab feels stable so the stop feels controlled when it is not.
What to do instead
Brake earlier and harder than instinct suggests, come to a complete stop with the brake held until the wheels are fully settled, and physically check the stop before releasing.
Downshifting or coasting through a downgrade and only then applying the brakes, letting the service brakes overheat and fade.
Drivers trust engine braking less than the pedal and delay shifting until speed is already climbing; they also misjudge how quickly a heavy trailer accelerates downhill.
What to do instead
Select a low enough gear before starting the descent so engine braking holds the speed, use intermittent firm brake applications rather than light continuous pressure, and never coast in neutral.
Performing a brake test that never checks for air loss, low-pressure warning, or trailer brake operation, then declaring the system 'good'.
Candidates memorize a checklist order but skip the measured steps because they cannot recall the acceptable leak rates or warning thresholds.
What to do instead
Build the test as a fixed sequence: static leak check with engine off and brakes released, applied leak check, low-air warning activation, and a tractor protection valve/trailer air check; state the pass criteria out loud as you go.
Ignoring the red and yellow ABS lamps during the walk-around, or assuming a lamp that stays on means the brakes are unusable.
Drivers either never learned what the lamps indicate or overreact to them, so they skip the check entirely or refuse to move the vehicle.
What to do instead
Confirm both lamps illuminate at power-up and cycle off above the ABS activation speed; if a lamp stays on, note that ABS is disabled but normal braking remains, and report the fault rather than refusing to drive.
Pulling the tractor out from under the trailer without confirming the landing gear is down and the trailer is chocked or restrained.
Rushed uncoupling sequences and skipped walk-around checks leave the trailer unsupported; candidates also forget the fifth-wheel release sequence.
What to do instead
Follow a fixed uncoupling order: park on level ground, chock wheels, lower landing gear to firm contact, disconnect lines and cable, release the fifth wheel, then pull forward slowly and stop to verify the trailer is stable.
Coupling by backing under the trailer and immediately tugging, without verifying the fifth wheel is locked and the trailer is at the correct height.
Candidates skip the tug test and visual latch check because they assume the audible click means a secure connection, and they misjudge trailer height so the kingpin rides over the plate.
What to do instead
Back under squarely, listen and feel for the lock, do a firm tug test in a low gear, visually confirm the release handle is in and the latch is closed, then connect air lines and raise the landing gear only after the connection is verified.
Running the inspection as a recited list of parts without actually checking coupling security, air line connections, and trailer brake operation.
The inspection is memorized as words rather than as a physical sequence, so candidates narrate items while standing in one place.
What to do instead
Walk the vehicle in a set path (front to rear, then rear to front), physically touch and test each item, and finish with an operational brake check at the trailer wheels before declaring the inspection complete.
Swinging wide on a right turn only at the corner, clipping the curb or a vehicle with the trailer's rear wheels.
Drivers track the tractor's path and forget the trailer cuts the corner; they also misjudge off-tracking on tight turns.
What to do instead
Set up wide before the turn, keep the tractor out from the curb, watch the trailer's rear wheels in the mirrors through the whole turn, and complete the turn slowly enough to correct.
Responding to a trailer skid or jackknife by braking hard and steering away from the slide.
Panic produces the instinctive light-vehicle response, but hard braking on a locked or sliding trailer axle worsens the jackknife.
What to do instead
Release the brakes to let the wheels roll and regain traction, steer in the direction the trailer is sliding to straighten the rig, then reapply brakes gently once the combination is aligned.
Loading cargo without confirming the weight is distributed correctly, overloading an axle, or leaving the load unsecured for the trip.
Candidates treat securement as a paperwork step and focus only on total weight, ignoring axle limits, load placement, and the number of tiedowns required.
What to do instead
Place heavy items over or ahead of the drive axles, verify each axle's weight against its limit, use the required number and rating of tiedowns, and recheck the load and tiedowns after the first few miles.