NJ CDL Combination study plan

Name every coupling component in order from tractor to trailer (fifth wheel jaws, kingpin, air lines, electrical cord, landing gear) and state the check performed on each

Walk through the full pre-trip inspection sequence for a combination vehicle and write it out from memory as a numbered checklist of at least 25 items

Explain the difference between the tractor protection valve, the trailer supply line, and the emergency line, and which one releases the trailer spring brakes

Identify the seven-step coupling procedure and the three-step tug test, and state the consequence of skipping each

Demonstrate the uncoupling sequence in correct order, including landing gear contact, trailer brake set, and line disconnection before pulling the pin

Trace the path of air from the compressor through the governor, reservoirs, treadle valve, relay valve, and brake chambers on a combination vehicle

Describe what the tractor protection valve does when trailer air pressure drops below roughly 45 psi and why that protects against a breakaway

Perform and interpret the three air brake tests: static leak-down with engine off, applied-pressure leak test, and low-air warning and spring brake pop-out check

Explain the purpose of the trailer hand valve and why it must never be used for parking or for normal stopping

Describe how a relay valve shortens brake application time on a long combination vehicle and what a stuck relay valve feels like from the cab

List the causes of brake fade on a long downgrade and state the correct gear-selection and snubbing technique to prevent it

Identify the symptoms of a dragging brake, a leaking chamber, and contaminated air (alcohol evaporator or dryer failure) and state the action for each

Describe the correct path of a right turn in a combination vehicle, including when to swing wide, how to use the pivot point, and why the trailer off-tracks to the inside

Calculate and explain off-tracking for a 90-degree turn and state how much extra space to allow for a 53-foot trailer

Explain the procedure for a lane change and a merge in a combination vehicle, including mirror use, signal timing, and the space needed to complete the move

State the stopping distance formula for a loaded combination vehicle at 55 mph and identify how much of that distance is reaction, lag, and actual braking

Describe how to control speed on a downgrade using gearing and snubbing, and state the rule for selecting a gear before starting the descent

Explain the effect of a light trailer or bobtail condition on braking and stopping distance, and why empty combinations need more following distance

Identify the three main causes of a jackknife and describe the corrective action for each, including what to do if the drive tires lose traction

Explain how to recover from a trailer swing versus a tractor jackknife, and why releasing the brakes can be the correct move

Explain the causes of a front-wheel skid and the correct response, including why locking the steer tires removes steering control

Describe the correct use of the retarder or engine brake on wet and icy surfaces and when it must be turned off

List the steps for responding to a tire blowout on a combination vehicle, including what not to do with the brakes

Explain hazard response for a brake failure on a downgrade, including using an escape ramp, and state the correct entry technique

Complete a full timed pre-trip inspection aloud on a combination vehicle, including the in-cab air brake test, within the time allowed by your state test

Perform coupling and uncoupling aloud with every step narrated, without prompting

Answer 60 mixed practice questions across all four domains and log every miss by domain

Re-study only the two domains with the lowest accuracy from the practice set

Re-test every item you missed in week 7 until each is answered correctly twice in a row

Rehearse the air brake test and coupling procedure one final time under test conditions

Review the specific New Jersey CDL manual sections on combination vehicles and air brakes for any state-specific differences

Confirm your appointment requirements, vehicle for the skills test, and documents needed on test day