Air Brakes Endorsement Test | Pennsylvania 2025 #2

Train for FREE online with our Pennsylvania CDL air brake test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a PA Class A/Class B driver license in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that the requirements for CDL may vary from state to state.

Number of Question 25

Passing Score 20

Number of Tests 20

1 . What happens if the air pressure in a system's air tanks falls below 60 psi?

A warning light will come on.

The vehicle will not shift out of gear.

The front lights will flash.

The vehicle should stop.

In an air brake system, a low pressure warning signal should activate if the pressure in the air tanks falls to a level below 60 psi. This signal may be in the form of a warning light or a wig wag.

2 . What does the air compressor governor do?

Controls when the air compressor pumps air into the air storage tanks.

Controls how quickly air leaves the air storage tanks.

Controls the temperature of the air entering the air storage tanks.

Controls the temperature of the air leaving the air storage tanks.

In an air brake system, the air compressor governor controls when the air compressor pumps air into the air storage tanks.

3 . When only the tractor is equipped with an Anti-Lock Braking System (ABS):

There is a decreased risk of jackknifing.

There is an increased risk of jackknifing.

The brakes will not work as effectively as they would without ABS.

The brakes will become more sensitive.

If a tractor is equipped with an Anti-Lock Braking System (ABS) but the trailer is not, the risk of jackknifing will be reduced and the driver should still be able to maintain steering control. If only the trailer is equipped with ABS, it is less likely that the trailer will swing out to one side.

4 . Service brakes should:

Be tested once a month.

Only be tested by a trained mechanic.

Be tested before every trip.

Before driving, you should always verify that your service brakes are in good working order. Testing the brakes before a trip allows you to locate any problems before you need to brake while on the road.

5 . In cold weather, an alcohol evaporator should be checked and filled:

Once a week.

Every day.

Every hour.

Once a month.

An alcohol evaporator can help prevent ice from building up in an air brake system. In cold weather, the evaporator should be checked and refilled every day.

6 . What kind of force must emergency brakes use?

Air pressure

Mechanical

Heavy

Electrical

Because air pressure can eventually leak away, the emergency brakes in an air brake system must be held on by mechanical force.

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2025 Pennsylvania | Frequently Asked Questions

In Pennsylvania, to secure a CDL Bus endorsement, you must first have a Commercial Driver's License (CDL). You then need to pass a Passenger Endorsement Knowledge Test and a School Bus Endorsement Knowledge Test. After passing these, you'll need to complete a School Bus Skills Test which includes a pre-trip inspection, basic controls, and an on-road driving test.

To obtain a CDL Bus license in Pennsylvania, you must first hold a valid Pennsylvania driver's license. Next, apply for a Commercial Learner's Permit (CLP) and pass the CDL general knowledge test. After 14 days, take and pass the Passenger Endorsement and School Bus Endorsement knowledge tests. Finally, pass a School Bus Skills Test, which includes on-road driving.

Yes, specific training is necessary for a CDL Bus endorsement in Pennsylvania. You must pass the Passenger Transport Test and the Skills Test in a bus-like vehicle. Although not required by law, many employers prefer drivers with professional driving experience or training from a vocational school or community college.

In Pennsylvania, CDL Bus licenses fall under three main classifications: Class A, B, and C. Class A CDL is for vehicles with a combined weight over 26,001 pounds where the vehicle being towed is over 10,000 pounds. Class B CDL is for single vehicles over 26,001 pounds or towing a vehicle not over 10,000 pounds. Class C CDL covers vehicles designed to transport 16 or more passengers.

No, you cannot use your personal vehicle for the CDL Bus driving test in Pennsylvania. The vehicle you use for the test must match the class and type of vehicle you plan to drive with your CDL. Therefore, you should use a bus for your CDL Bus driving test, ensuring it meets all safety standards and regulations.

During the CDL Bus driving test in Pennsylvania, the examiner assesses your ability to perform various maneuvers and skills. These include pre-trip vehicle inspection, basic vehicle control (including backing up, turning, and parking), and on-road driving. On-road driving tests your ability to handle intersections, railway crossings, curves, and more. You'll also be evaluated on proper passenger safety procedures.

Yes, in Pennsylvania, to obtain a CDL Bus endorsement, you must pass a Department of Transportation (DOT) physical examination. This ensures you're physically capable of operating a commercial vehicle safely. The exam assesses various health aspects including vision, hearing, blood pressure, and checks for conditions like diabetes or heart disease that could affect your ability to drive.

No, it is illegal to transport passengers in Pennsylvania without a valid CDL Bus endorsement. This endorsement is necessary for any driver operating a vehicle designed to carry 16 or more passengers, including the driver. Driving without the proper license or endorsement can result in hefty fines, penalties, and even jail time.

Yes, a CDL Bus endorsement can be added to your existing CDL license in Pennsylvania. You don't need to apply for a new license. However, you must pass the necessary written and skills tests related to passenger vehicle operation. Once you pass, the bus endorsement will be added to your existing CDL license.

Yes, there are limitations for drivers with a CDL Bus endorsement in Pennsylvania. Drivers must not have more than two moving violations in a commercial vehicle in the past two years. They also cannot have any conviction for a disqualifying offense while operating a commercial vehicle, such as DUI, hit-and-run, or felony involving a vehicle.