Missouri CDL Class B to A Upgrade Study Material
Everything for upgrading a Missouri Class B CDL to Class A, in one place: Combination Vehicles, Air Brakes, Class B to A Upgrade. Each one has the official manual rewritten section by section with its diagrams, a quick review of what the test asks about, practice questions with every answer explained, and narrated audio for the drive. It settles the parts that catch people out, like how to spot a trailer skid before it gets away from you.
Missouri Class B to Class A Upgrade Study Material Overview
Upgrade prep for Class B CDL holders moving to Class A, including combination vehicles, coupling, air brakes, and HOS theory.
Class B to Class A Upgrade for Missouri CDL Applicants
Missouri's central location makes it a critical cross-country freight junction connecting all four US quadrants. With agriculture and grain, automotive assembly, beer and beverage distribution driving much of the freight in Missouri, the Class B to Class A Upgrade material below is the part of the Missouri CDL that those employers screen for first.
The Missouri Class B to A upgrade: Combination Vehicles and Air Brakes knowledge tests at Missouri Department of Revenue, then a Class A skills test. Since February 2022, ELDT theory and behind-the-wheel training must also be logged with an FMCSA-registered provider before Missouri Department of Revenue will schedule the test.
Where Missouri drivers use this
- Beer and beverage distribution: regional and over-the-road tractor-trailer distribution runs
- Aerospace components: oversize aircraft sections and aerospace components on specialized flatbed and step-deck trailers
- Automotive assembly: the tractors and straight trucks on every plant route
- Aerospace components: the heavy-haul tractors and straight trucks on aerospace plant routes
- Almost every Class A and Class B vehicle in Missouri; skip this test and your CDL carries an L restriction
Most Missouri CDL work runs the I-44, I-55, I-70 corridors and the Jefferson City area, so the examples in the practice questions lean on the vehicles and loads you will see there.
Testing, appointments, and fees are handled by Missouri Department of Revenue. See the Missouri CDL classes and Missouri endorsements pages for the full licensing picture.
Common Missouri questions
- Is this Class B to Class A Upgrade material specific to Missouri?
- Yes. The knowledge test content is federal (49 CFR 383), so the questions apply in Missouri, and this page adds Missouri details: where you test (Missouri Department of Revenue), which Missouri industries use this license, and the Missouri corridors the examples are drawn from.
- Where do I take the Class B to Class A Upgrade knowledge test in Missouri?
- Knowledge tests are given by Missouri Department of Revenue. Bring your Missouri driver license, proof of residency, and your medical certificate; most Missouri offices require an appointment for CDL testing.
- How long do I have to study the Missouri Class B to Class A Upgrade material?
- Access lasts 120 days from purchase, and you can take 180 or 365 days instead at checkout. That is enough to study, take the practice tests, and pass at Missouri Department of Revenue with time to spare. Retakes in Missouri are allowed after a short wait, so a second attempt is covered too.
Who should get the Missouri Class B to Class A Upgrade Study Material
Already hold a Class B and being asked to pull trailers? Moving up to Class A means passing Combination Vehicles and Air Brakes. This program covers both, plus the upgrade theory.
Topics Covered for Missouri Class B to Class A Upgrade Study Material
Upgrading from Class B to Class A means operating vehicles with fundamentally different handling. Off-tracking, rearward amplification, and trailer swing all require new driving habits. The Combination Vehicles written test focuses on these differences compared to single heavy vehicles.
Correctly connecting a tractor to a trailer is a critical Class A skill tested both on the written exam and during the skills test. This module covers the exact coupling sequence that examiners expect to observe during the pre-trip exercise.
Class A combination vehicles use service and emergency air lines between the tractor and trailer that Class B drivers have not typically operated. You will learn how to connect them correctly, perform pressure checks, and identify warning signs of failure.
Adding a trailer to your pre-trip inspection means covering the coupling area, fifth wheel, air connections, trailer brakes, and landing gear in sequence. The Class A skills test expects you to demonstrate all of these additional inspection points.
The Class A upgrade requires passing the Combination Vehicles written knowledge test plus completing a new skills test on a Class A vehicle. This section prepares you for the content differences, scoring criteria, and what Class A evaluators assess differently from Class B.
Missouri Class B to Class A Upgrade Study Material
MO Class B to Class A Upgrade Study Material Includes
- Combination Vehicles
- Air Brakes
- Class B to A Upgrade Theory
$39.85$37.95
You save $1.90 vs. buying the MO CDL test prep study material separately
120, 180, 365 days of access · No subscription
No subscription, no auto-renewal: 120 days of access included, or extend to 180 or 365 days at checkout.
Failing your Missouri CDL exam costs more than preparing.