Free California CDL Practice Test (2026)
Practice the California CDL permit test the way it is really written, with the correct answer and an explanation on every question.
California CDL Requirements
5-Question CA Challenge
Real general knowledge questions, with the answer and an explanation after each one.
What is the primary function of an alcohol evaporator in an air brake system during winter?
California CDL permit test: what to expect
The written exam most people call the California CDL permit test is the general knowledge test, and passing it is what gets you a commercial learner's permit rather than the license itself. You need 80% to pass, a federal standard that is the same in every state. The number of questions is set by California, and our practice tests use the common 50-question format.
Once you hold the permit you have to keep it for at least 14 days before you are allowed to attempt the skills test, so it is worth sitting the written exam as early as you can. Practice below until you are clearing California's standard comfortably rather than scraping it.
How to get a CDL in California
To obtain a Commercial Driver's License in the California, you must first pass the General Knowledge exam. Depending on the type of vehicle you intend to drive, additional endorsements like Air Brakes, Tanker, or Hazmat may be required.
- Get a DOT medical exam, and if this is your first Class A or B license, finish your Entry-Level Driver Training (ELDT) with an FMCSA-registered provider.
- Fill out the commercial license application, bring your medical certificate and a 10-year driving history, and pass the knowledge tests for your class at a DMV office. You need 80% to pass.
- Get your commercial learner permit (CLP) and hold it for at least 14 days before the drive test.
- Practice with a licensed CDL holder, then schedule and pass the three-part drive test: pre-trip inspection, basic control skills, and the on-road drive.
- Pay the $100 fee for your original Class A or B CDL to have your California commercial driver's license issued.
Test fees: $100 for the original Class A or B CDL (this covers your knowledge and drive tests). Official source: California DMV.
What's on the California CDL test
Getting a California CDL means passing two things: a written knowledge test and a three-part drive test. The General Knowledge test has 50 questions, and you need at least 80% to pass. If you want endorsements, each one adds its own written test, and some vehicles also require the Air Brakes and Combination Vehicles tests.
California offers the commercial knowledge tests in English, Spanish, Arabic, Chinese, Punjabi, and Russian, though the hazardous materials test has to be taken in English. Once you apply, you have 12 months to finish every test and pass the drive test, or the application expires and you start over. Practicing the real question style ahead of time is the simplest way to clear the 80% bar on the first visit.
California CDL endorsements and what they let you haul
Endorsements are add-ons that let you drive specific kinds of commercial vehicles, and each one has its own knowledge test. The H endorsement covers hazardous materials and also requires a TSA background check and fingerprinting. The N endorsement covers tank vehicles, and the T endorsement covers doubles and triples.
If you plan to carry people, the P endorsement covers passenger vehicles built for 10 or more, and the S endorsement covers school buses on top of that. A lot of California drivers pair Tank and HazMat, since the state's refineries and ports pay a premium for drivers who can haul fuel and chemicals.
What can disqualify you from a California CDL
California follows the federal disqualification rules, and they are strict. A first major violation, such as driving under the influence, leaving the scene of an accident, or using a commercial vehicle to commit a felony, disqualifies you for at least one year. If it happened while you were hauling placarded hazardous materials, it's three years. A second major violation disqualifies you for life.
Smaller offenses add up too. Two serious traffic violations in a commercial vehicle within three years, like reckless driving or improper lane changes, cost you a 60-day disqualification, and a third within three years costs you 120 days. Keeping a clean record is worth real money in California, where employers screen hard and the best-paying dedicated lanes go to drivers with spotless histories.
Practice every part of the California CDL test
Your California exam is split into separate knowledge tests. Drill each one until you're confident.
5 California CDL Practice Questions and Answers
Here are 5 sample California general knowledge questions with the right answer and a quick explanation for each. Read through them, then take the quiz above to see how you do without looking.
1. What is the primary function of an alcohol evaporator in an air brake system during winter?
- A. To clean the air filters.
- B. To cool the compressor faster.
- C. To prevent moisture in the air lines from freezing. (correct answer)
- D. To increase the braking pressure on icy roads.
Why: An alcohol evaporator puts alcohol into the air system to reduce the risk of ice forming in air brake valves and other parts, which could cause brake failure.
2. When inspecting dual tires, what is a crucial element to look for between the wheels?
- A. That the mud flap is touching both tires.
- B. That the inner rims are welded together.
- C. That there is proper spacing, the tires are not touching, and there is no debris lodged between them. (correct answer)
- D. That there is a cross-tread pattern connecting them.
Why: When inspecting dual tires, you must verify they are evenly spaced, not touching each other, and that no rocks or debris are wedged between them.
3. Why should you back slowly?
- A. Because commercial vehicles do not have reverse lights.
- B. It allows you to make steering corrections easily and stop quickly if necessary. (correct answer)
- C. It saves wear and tear on the reverse gear synchros.
- D. It prevents the air brake pressure from dropping rapidly.
Why: Backing slowly gives you the crucial time needed to monitor your path, correct your steering, and stop before hitting an obstacle.
4. If you sound your horn to warn a pedestrian walking near the edge of the road, what must you still be prepared to do?
- A. Speed up to pass them quickly.
- B. Stop or take evasive action, because they might not hear the horn or may step into the road anyway. (correct answer)
- C. Assume they will immediately step off the road.
- D. Turn on your four-way flashers and force them into the ditch.
Why: You cannot assume a pedestrian hears your horn or will react safely. They could be distracted, deaf, or simply step the wrong way. Always be prepared to stop.
5. Which of the following is the best way to handle severe sun glare while driving?
- A. Drive faster to get out of the sun quickly.
- B. Turn off your headlights.
- C. Keep the windshield clean, use sun visors, and wear sunglasses. (correct answer)
- D. Look directly at the sun to adjust your eyes.
Why: A dirty windshield scatters light and makes glare much worse. Sun visors and polarized sunglasses also help maintain visibility.
CDL Job Market in California
California has some of the highest-paying specialized routes you'll find anywhere. The state runs the nation's busiest import ports and the most productive farm region on earth, so CA drivers are right at the center of the supply chain. Entry-level Class A drivers in Los Angeles usually start around $59,950, and experienced drivers on dedicated lanes regularly report more than $90,000 a year.
FedEx Freight, UPS Freight, Old Dominion Freight Line, Schneider National
California CDL average: $60,490 in 2026 (BLS). Driver demand here is among the highest in the country, fed by port work in Long Beach and ag freight out of the Central Valley.
California CDL Test FAQs
How old do you have to be to get a CDL in California?
You can get a commercial learner permit at 18 and drive commercially within California. To drive across state lines or haul hazardous materials, you have to be 21.
What score do I need to pass the California CDL knowledge test?
You need at least 80% on each knowledge test at the DMV. Our free California CDL practice tests use the same question style, so you'll know where you stand before you go in.
How much does a California CDL cost?
An original Class A or B CDL is $100, which covers your knowledge and drive tests. A commercial drive-test retake is $46, and a Class C commercial license is $59.
How long do I have to hold my California commercial learner permit?
You must hold your CLP for at least 14 days before you're allowed to take the CDL drive test. That waiting period is a federal rule that California follows.
How many questions are on the California CDL general knowledge test?
The General Knowledge test follows the standard 50-question format that every new CDL applicant takes. Study the California Commercial Driver Handbook with our practice tests and you'll have seen every topic first.
Can I take the California CDL written test in Spanish?
Yes. California offers the commercial knowledge tests in English, Spanish, Arabic, Chinese, Punjabi, and Russian. The one exception is the hazardous materials test, which federal rules require you to take in English.
How long is my California commercial learner permit valid?
Your CLP is valid for up to 180 days and can be renewed once for up to another 180 days, but no longer than one year from your application date. You also have to hold it for at least 14 days before you can take the drive test.
What can disqualify me from getting a California CDL?
A first major violation, such as a DUI, leaving the scene of an accident, or using a commercial vehicle to commit a felony, disqualifies you for at least one year, or three years if it happened in a placarded hazmat vehicle. A second major violation is a lifetime disqualification. Two serious traffic violations in a commercial vehicle within three years cost you 60 days, and three cost you 120 days.
What endorsements can I add to a California CDL?
The common ones are H for hazardous materials, N for tank vehicles, T for doubles and triples, P for passenger vehicles, and S for school buses. Each endorsement has its own knowledge test, and the hazmat endorsement also requires a TSA background check and fingerprinting.