Hey future trucker, if you’re looking at your CDL and you see the letter “L” printed under the Restrictions column, I want you to know two things right away.
- First, you are not alone! This is one of the most common restrictions we see on new drivers’ licenses.
- Second, it is absolutely removable. It just takes knowing the right steps.
In this guide we are going to break down exactly what the L restriction means, why you got it, how badly it limits your job options. Most importantly, we’re gonna talk about the exact step-by-step process to get it removed so nothing is standing between you and the career you want.
Not sure where to start? Talk to a CDL Advisor
What Is the L Restriction on a CDL?
An L restriction on a Commercial Driver’s License indicates that the driver is not authorized to operate a commercial motor vehicle equipped with air brakes. In plain terms: If your CDL has an L restriction, you cannot legally get behind the wheel of any truck, bus, or commercial vehicle that uses an air brake system as its primary means of stopping.
Since most CMVs over 26,000 pounds rely on air brakes, an L restriction can significantly limit employment opportunities for those pursuing a Class A or Class B CDL. Think about that for a second. If you want to drive a standard tractor-trailer, a large dump truck, a transit bus, or most Class A and Class B commercial vehicles, those all run on air brakes. The L restriction essentially closes the door on the majority of high-paying commercial driving jobs until you get it removed.
What Causes the L Restriction?
The L restriction is applied when a driver does not pass the air brakes knowledge test, or takes the CDL skills test in a vehicle that does not use air brakes. More specifically, here are all the ways you can end up with an L on your license:
- You failed the air brakes written knowledge test at the DMV. The air brakes section is a separate module on the CDL permit exam. If you skipped it or didn’t pass it, the restriction gets applied automatically.
- You didn’t take the air brakes knowledge test at all. This catches a lot of first-time applicants off guard. If you show up to the DMV, pass your general knowledge test, and walk out with your CLP without taking the air brakes module, the L restriction goes on your permit and carries forward to your CDL.
- You took your CDL skills test in a vehicle without air brakes. Many CDL schools train students on trucks with hydraulic brake systems because they’re cheaper to maintain. If your road test vehicle didn’t have air brakes, the restriction gets added regardless of how well you drove.
Also there are technically two different air brake restriction codes which are the L restriction and the Z restriction, and they are slightly different. Let’s make sure you know which one you actually have.
L Restriction vs. Z Restriction
These two get confused constantly, and it matters because the removal process is slightly different.
| L Restriction | Z Restriction | |
|---|---|---|
| What it means | No air brake vehicles at all | No full air brake vehicles |
| How it's triggered | Failed air brake test OR tested in a hydraulic brake vehicle | Tested in an air-over-hydraulic (partial air) vehicle |
| What you CAN drive | Hydraulic brake vehicles only | Some partial air-assisted platforms |
| What you CANNOT drive | Any vehicle with air brakes as the primary system | Full air brake tractor-trailers and large CMVs |
| How to remove it | Pass air brake knowledge test + skills test in full air brake vehicle | Pass skills test in a full air brake vehicle |
How Does the L Restriction Affect Your Job Options?
Let’s be completely straight with you here, because this is important if you’re job hunting right now with an L restriction on your license.
- Class A driving jobs: severely limited. Standard tractor-trailers, flatbeds, tankers, refrigerated units, virtually all of them run on full air brakes. If you hold a Class A CDL with an L restriction, most Class A job postings will screen you out before you even get to the interview.
- Class B driving jobs: heavily limited. Large dump trucks, transit buses, and most heavy straight trucks over 26,000 pounds use air brakes. The L restriction eliminates most of these too.
What you CAN drive with an L restriction:
- Light box trucks with hydraulic brakes (think smaller delivery vehicles)
- Hotshot setups using pickup trucks and gooseneck trailers (under 26,000 lbs combined)
- Certain smaller Class C commercial vehicles
The reality is that almost all vehicles over 26,000 pounds use air brakes, making the L restriction very limiting for those looking for Class A or B CDL jobs.
There is one specific scenario worth knowing about that no other article covers: a driver with an air brake restriction may operate a CMV equipped with a hydraulic braking system that has an air-assisted parking brake release. The air brake restriction applies only to the principal braking system used to stop the vehicle, it is not applicable to an air-assisted mechanism to release the parking brake. So if you encounter a hydraulic-braked truck that uses a small air assist just for the parking brake release, that vehicle is still legal for you to drive.
But bottom line is that if you want a real career in trucking, the L restriction needs to come off. The good news is it’s one of the most straightforward restrictions to remove.
If you need help lifting the L restriction and make more money,
Driving Academy can help!
Does Removing the L Restriction Require ELDT?
This is a question we get a lot, and the answer is worth knowing clearly before you start the process.
Drivers applying for removal of a restriction from their CDL which includes the no air brake (L), no full air brake (Z), and no manual transmission (E) restriction are not subject to the Entry-Level Driver Training (ELDT) regulations.
That means you do not need to enroll in a federally registered ELDT program or complete a full course with a Training Provider Registry school just to remove your L restriction.
That said, practically speaking, you still need to actually know how to operate air brakes and pass both the written and skills tests. Getting professional training before you attempt the tests is absolutely worth it. Showing up to a skills test in an air brake truck without proper practice is how people fail and waste time. That’s where Driving Academy can help as we have half course that provides the equipment and training you need without forcing you through an unnecessary full-length CDL program.
How to Remove the L Restriction
Here is the exact process. Follow these steps in order and nothing will slow you down.
Step 1: Pass the Air Brakes Knowledge Test
Your first stop is the DMV. You need to take and pass the Air Brakes written knowledge test. This is the written exam module that covers how air brake systems work, their components, inspection procedures, and safe operation.
What the test covers:
- Air brake system components (compressor, reservoirs, valves, chambers)
- How to perform an air brake check during pre-trip inspection
- Brake lag and stopping distance differences vs. hydraulic brakes
- Spring brakes and parking brake operation
- Air loss rate limits and low pressure warning systems
- Dual air brake systems
Study the Air Brakes section of your state’s CDL Manual thoroughly. This is not a long section but it is specific. You need to know the inspection procedures and the federal limits (for example, air pressure loss rates, minimum pressure before driving) cold.
The good news is that the air brakes test can be retaken as many times as necessary until the restriction is lifted. So if you don’t pass the first time, you can come back and try again.
Step 2: Get Your Updated CLP/Permit
In most states, once you pass the air brakes written test, your CLP needs to be updated to reflect that you now have air brake testing authorization. The driver must purchase a CDL permit with the restriction removed before proceeding to the skills test.
Step 3: Train in a Full Air Brake Vehicle
This is where you prepare for the skills test. You need practice time behind the wheel of a commercial vehicle equipped with a full air brake system and not hydraulic, not air-over-hydraulic, but full air brakes.
During your training, focus specifically on:
- Air brake pre-trip inspection: You will need to walk the examiner through the complete air brake inspection during your skills test. This includes checking for air leaks, testing low pressure warning devices, testing the spring brake pop-out, and checking the brake pedal for proper feel and response. This is the part most people underprepare for.
- Air brake feel and application: Air brakes respond differently than hydraulic brakes. There is a slight lag between pressing the pedal and full brake engagement. Stopping distances are longer in certain conditions. You need enough seat time to feel comfortable and natural with the system before the examiner gets in that cab.
- Air loss rate check: During pre-trip, you will be expected to build air pressure to governor cutoff, turn off the engine, release the service brakes, and then monitor the air pressure gauge. You need to know the acceptable loss rate limits cold.
Step 4: Pass the CDL Skills Test in an Air Brake Vehicle
Schedule your CDL skills test at your state DMV or through an approved third-party tester. Complete the skills test in a vehicle equipped with air brakes, including both the vehicle inspection and on-road driving portions.
The three parts of the skills test remain the same:
- Pre-trip vehicle inspection with full air brake system walkthrough
- Basic vehicle control (backing maneuvers)
- On-road driving test
Make sure the vehicle you use for the test is properly documented — you’ll need the registration and insurance for the vehicle. If you are using a Driving Academy vehicle, we handle all of that for you.
Step 5: Get Your New CDL Issued
Once you complete the skills test successfully, obtain a new CDL with the L restriction removed. Standard licensing fees apply. Go to your state DMV, submit your passing test results, pay the standard CDL issuance fee, and your new license will be issued without the L restriction on it.
Frequently Asked Questions
It means you are not authorized to operate any commercial motor vehicle that uses air brakes as its primary braking system. It was either triggered by failing the air brakes knowledge test or by completing your CDL skills test in a vehicle without air brakes.
Yes, you can still drive commercial vehicles that use hydraulic brakes. However, since the vast majority of Class A and Class B commercial vehicles use air brakes, the L restriction severely limits your job options in most segments of the industry.
You need to retake the skills test, but only in a vehicle with air brakes. You do not need to retake the general knowledge test or start the CDL process from scratch. The removal process is specifically targeted at the air brake components.
No. Federal FMCSA rules specifically exempt L, Z, and E restriction removals from the ELDT requirement. You need to pass the air brakes knowledge test and the skills test in an air brake vehicle, but you do not need to complete a full ELDT program.
The L restriction means no air brake vehicles at all, you tested in a hydraulic brake vehicle or failed the air brake test. The Z restriction means no full air brake vehicles, you tested in a vehicle with a partial or air-over-hydraulic system. The Z is slightly less restrictive than the L, but both need to be removed for full Class A and B driving privileges.
Yes. According to the FMCSA, the air brake restriction applies only to the vehicle's principal braking system. A truck that uses hydraulic brakes to stop but has an air-assisted mechanism to release the parking brake is still legal to drive with an L restriction.
