Missouri CDL Combination study plan

Missouri CDL Combination · Give each week a clear focus.

8 weeks · About 7 hours per week

Week 1

Combination Vehicle Knowledge Test

Define the three coupling systems on a combination vehicle (fifth wheel, air lines, electrical cord) and state the order in which they are connected and disconnected
Label a blank diagram of a tractor-trailer with kingpin, fifth wheel plate, locking jaws, release handle, glad hands, and trailer air lines
Explain why the trailer supply valve (red) and trailer parking brake must be set before coupling, in your own words
List the four steps of the walk-around coupling check and state what a visual low-fifth-wheel gap or a tug test failure tells you

A one-page hand-drawn coupling and uncoupling checklist with all steps in correct order, scored against the manual with no more than one omission

Week 2

Describe how a trailer hand valve and the tractor protection valve interact, and state when the hand valve must not be used for parking
Explain the causes and prevention of trailer swing, jackknife, and rearward amplification in a longer combination
Compute the off-tracking path of a 53-foot trailer in a 90-degree turn and describe how to set up the turn to keep the trailer off the curb
Identify the correct braking technique for a downgrade with a combination vehicle, including proper use of engine brakes and snub braking

A written answer set of 20 combination-vehicle practice questions with a short justification for each answer, scoring at least 85 percent

Week 3

Recite the seven-step vehicle inspection sequence in order without notes
Identify what to check at each step for a combination vehicle, including coupling devices, air lines, and landing gear
Explain the air brake leak test procedure: build pressure, shut off engine, watch the gauges for one minute, and state the acceptable loss for tractor-trailer units
Describe how to test the trailer spring brakes and the tractor protection valve during the inspection
State the legal and safety consequences of skipping the inspection, including out-of-service criteria for brakes and coupling devices

A timed 15-minute verbal walk-around of a combination vehicle performed for a study partner, who scores it against the seven-step list

Week 4

Perform a full pre-trip inspection on a real or simulated combination vehicle and self-score every item
Demonstrate the in-cab inspection items: seat belt, gauges, horn, wipers, heater, defroster, mirrors, and parking brake test
Explain how to check slack adjusters and brake chamber pushrod travel, and state the adjustment limit
Describe the coupling system inspection: fifth wheel jaws closed, mounting bolts, air line condition, and electrical cord security

A completed self-scored inspection sheet with every item marked pass or fail and a written correction plan for any failed item

Week 5

Practice straight-line backing, offset backing to the left and right, and alley docking in a controlled lot
Set up and hold a 90-degree alley dock using proper mirror discipline and GOAL (get out and look) habits
Explain how pivot points and trailer length change your steering inputs while backing
Demonstrate a controlled stop from 20 mph in a straight line with smooth, progressive braking
Describe the scoring criteria for the basic control skills test and identify your two weakest skills

A practice log of 10 backing attempts with distance from the cone line recorded for each, showing measurable improvement over the session

Week 6

Combine the three basic control skills into one continuous run under time pressure
Explain lane positioning, following distance, and speed management for a combination vehicle on urban and rural roads
Describe the correct procedure for turning right without striking the curb, and for turning left without cutting the corner
State the rules for railroad crossings in a combination vehicle, including when to stop and when to check the trailer

A full mock basic control skills test scored on a standard point system, with a written list of every point deducted

Week 7

Describe how to handle a downgrade, including gear selection before the grade and brake use during it
Explain what to do if the trailer starts to swing or the vehicle begins to jackknife
State the correct response to a tire failure, a brake failure, and a loss of air pressure while driving
Describe safe passing, merging, and lane-change procedures for a tractor-trailer, including checking blind spots and trailer tracking
Explain hours-of-service awareness and fatigue management as part of on-road safety

A written emergency-response sheet covering five in-motion emergencies, each with a cause, immediate action, and prevention note

Week 8

Complete a full mock road test covering pre-trip, basic control, and on-road driving
Review every missed item from weeks 1 through 7 and re-answer those questions correctly
Recite the coupling and uncoupling procedures and the seven-step inspection from memory
Identify remaining weak areas and schedule targeted practice before the actual test

A full mock test scored against all four domains with a pass or fail result and a written remediation plan for any domain below 80 percent

Week 2: Score at least 85 percent on a 20-question combination-vehicle knowledge set and explain every wrong answer without notes

Week 4: Complete a full seven-step pre-trip inspection in 15 minutes or less with no more than two missed items

Week 6: Pass a mock basic control skills test with zero disqualifying errors and a written breakdown of every point deducted

Week 8: Pass a full mock road test across all four domains and hold a written remediation plan for any domain below 80 percent