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Colorado CDL Class B to A Upgrade Study Material

Everything for upgrading a Colorado 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.

Colorado 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 Colorado CDL Applicants

Colorado drivers navigate mountain grades and energy-sector hauls across the Rocky Mountain corridor. With oil and gas field services, agriculture, ski resort and mountain freight driving much of the freight in Colorado, the Class B to Class A Upgrade material below is the part of the Colorado CDL that those employers screen for first.

The Colorado Class B to A upgrade: Combination Vehicles and Air Brakes knowledge tests at Colorado Division of Motor Vehicles, 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 Colorado Division of Motor Vehicles will schedule the test.

Where Colorado drivers use this

  • Ski resort and mountain freight: event and production freight moving between venues
  • Aerospace components: oversize aircraft sections and aerospace components on specialized flatbed and step-deck trailers
  • Oil and gas field services: nearly every oilfield truck runs air brakes
  • Aerospace components: the heavy-haul tractors and straight trucks on aerospace plant routes
  • Almost every Class A and Class B vehicle in Colorado; skip this test and your CDL carries an L restriction

Most Colorado CDL work runs the I-25, I-70, I-76 corridors and the Denver 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 Colorado Division of Motor Vehicles. See the Colorado CDL classes and Colorado endorsements pages for the full licensing picture.

Common Colorado questions

Is this Class B to Class A Upgrade material specific to Colorado?
Yes. The knowledge test content is federal (49 CFR 383), so the questions apply in Colorado, and this page adds Colorado details: where you test (Colorado Division of Motor Vehicles), which Colorado industries use this license, and the Colorado corridors the examples are drawn from.
Where do I take the Class B to Class A Upgrade knowledge test in Colorado?
Knowledge tests are given by Colorado Division of Motor Vehicles. Bring your Colorado driver license, proof of residency, and your medical certificate; most Colorado offices require an appointment for CDL testing.
How long do I have to study the Colorado 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 Colorado Division of Motor Vehicles with time to spare. Retakes in Colorado are allowed after a short wait, so a second attempt is covered too.

Who should get the Colorado 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 Colorado Class B to Class A Upgrade Study Material

Combination Vehicle Dynamics

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.

Coupling and Uncoupling Procedure

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.

Air Line Connections

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.

Colorado CDL Trailer and Coupling Inspection

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.

Colorado CDL Class A Test Readiness

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.

Colorado Class B to Class A Upgrade Study Material

CO 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 CO CDL test prep study material separately

Study Material Access Duration

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 Colorado CDL exam costs more than preparing.