Oklahoma CDL Combination study plan
Oklahoma CDL Combination · Give each week a clear focus.
8 weeks · About 6 hours per week
Air Brakes and Brake Systems on Combination Vehicles & Combination Vehicle Basics and Rollover Risks
Explain how a tractor protection valve, relay valve, and spring brakes interact when air pressure drops, and state the pressure at which the warning buzzer and spring brakes activate
Perform the three air-brake leak tests (static with engine off, applied-pressure leakage, low-pressure warning) in sequence and interpret pass/fail results
Describe how a lightly loaded or empty trailer changes stopping distance and brake balance compared with a loaded trailer
List the four conditions that most often cause combination-vehicle rollover and match each to a specific driver action that prevents it
Your checkpoint
A one-page air-brake cheat sheet showing each test, the gauge reading to watch, the pass criterion, and the corrective action for a failure
Coupling and Uncoupling & Inspection of Combination Vehicles
Recite the coupling sequence in order, including the pre-coupling inspection of the fifth wheel, kingpin, and apron
Recite the uncoupling sequence in order, including landing gear, air lines, electrical cord, and the pull-away test
Name the high-value items on a combination pre-trip inspection and state the defect each one would show if worn or broken
Differentiate a visual check from a physical check for fifth-wheel jaws, locking pins, and safety latches
Explain why the tractor must be backed under the trailer squarely and what a high hook or low hook does to the coupling
Your checkpoint
A written coupling and uncoupling script in numbered steps, plus a 15-item pre-trip checklist for the tractor-trailer connection
Tractor-Trailer Turning, Off-Tracking, and Lane Control & Hazard Perception, Space Management, and Speed Control
Define off-tracking and calculate how much the rear wheels cut the corner for a given wheelbase and turn radius
Describe how to set up a right turn so the trailer's rear wheels clear the curb without swinging the tractor into oncoming traffic
Identify when to begin a lane change with a long combination vehicle and how to verify the trailer has cleared the adjacent lane
Apply the four-second following rule and adjust it for rain, night, and heavy traffic
Scan ahead 12 to 15 seconds and name the hazards that should trigger a speed reduction before the vehicle reaches them
Your checkpoint
A sketched diagram of a right turn and a left turn showing tractor path, trailer path, off-tracking gap, and the mirror checks at each stage
Antilock Braking Systems (ABS) & Skid Control, Jackknifing, and Emergency Maneuvers
Explain what ABS does and does not do, and state that it does not shorten stopping distance on all surfaces or replace the need to brake early
Identify the ABS lamp locations on a combination vehicle and describe how to test that the system is working
Describe the correct response to a tractor jackknife, a trailer jackknife, and a front-wheel skid, including what to do with the brakes and steering
Explain how to recover from a drive-wheel skid and why releasing the brakes is the first move
State the conditions that make a jackknife likely and the driving habits that reduce the risk
Your checkpoint
A skid-recovery decision table covering four skid types with the correct steering and brake response for each, written from memory and then checked against your notes
Backing and Parking Combination Vehicles & Cargo Securement, Weight Distribution, and Load Limits
Describe the GOAL method and the use of both mirrors plus a spotter when backing a combination vehicle
Explain the pull-up technique for correcting a misaligned trailer while backing and when to stop and start over
Compute the weight limits for a given tractor-trailer using axle ratings, tire ratings, and bridge formula basics
Explain how to distribute cargo to keep weight on the steer axle, drive axles, and trailer axles within limits
List the four cargo securement requirements: restraint system, working load limit, number of tiedowns, and aggregate strength
Your checkpoint
A weight-and-balance worksheet solved for one sample load, showing axle loads before and after shifting cargo, with a written justification for the final placement
Combination Vehicle Basics and Rollover Risks & Air Brakes and Brake Systems on Combination Vehicles
Describe the difference in handling between a loaded and an empty combination vehicle in braking, turning, and crosswind
Explain how brake fade develops on a long downgrade and how to control speed using gearing and engine braking
State the correct use of the trailer hand valve and why it must not be used for parking
Explain how to check that the trailer brakes are working using the tug test and a rolling brake check
Describe what to do if the low-air warning sounds while driving
Your checkpoint
A downgrade driving plan for a 6 percent grade one mile long, listing gear selection, target speed, brake application strategy, and the escape action if brakes fade
Coupling and Uncoupling & Inspection of Combination Vehicles & Tractor-Trailer Turning, Off-Tracking, and Lane Control & Backing and Parking Combination Vehicles
Complete a full combination pre-trip inspection aloud within the time limit, covering coupling, air brakes, lights, tires, and cargo
Perform coupling and uncoupling aloud with every step narrated, including the pull-away test
Demonstrate the right-turn setup and the backing maneuver in a practice lot or with a qualified instructor
Self-score each skill against the official scoring criteria and list your three weakest points
Correct each weak point with a targeted drill and re-test it
Your checkpoint
A timed mock skills test with a self-score sheet and a written correction plan for the three weakest items
Antilock Braking Systems (ABS) & Skid Control, Jackknifing, and Emergency Maneuvers & Cargo Securement, Weight Distribution, and Load Limits & Hazard Perception, Space Management, and Speed Control
Answer 100 mixed practice questions across all ten domains and review every missed item to its source rule
Re-explain ABS limits, skid recovery, and cargo securement rules from memory without notes
Re-take the weakest two domains from weeks 1 through 7 and confirm improvement
Build a final one-page summary of the ten rules you are most likely to forget under test pressure
Confirm test-day logistics: appointment, required documents, and vehicle condition for the skills test
Your checkpoint
A practice test score report by domain showing at least 85 percent overall and no domain below 80 percent, plus the one-page final summary
Milestones
Week 2: Recite the full coupling and uncoupling sequences from memory with no missed step, and pass a 25-question quiz on Domains 2 and 3 at 80 percent or better
Week 4: Pass a 40-question quiz covering Domains 1, 4, 5, and 8 at 85 percent or better, and explain the three air-brake leak tests without notes
Week 6: Score 85 percent or better on a 50-question mixed quiz across Domains 1 through 9, and complete the weight-and-balance worksheet with all axle loads within limits
Week 8: Score 85 percent or better overall on a 100-question practice test with no domain below 80 percent, and complete a timed mock pre-trip and skills test with a self-score