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CDL STudy/testing flashcards Oklahoma 2017
Terms in this set (24)
Why should you check the traffic on either side and in back of you in your mirrors regularly
Know where there is space to go in an emergency
The maximum leakage rates per minute after the initial drop are
Three psi for single vehicles and 4 psi for combination vehicles (10-7=, 10-6=)
Spring brakes are
Spring brakes are an important "back-up system"--powerful springs that put brakes on if they sense that the air pressure has been lost for some reason, such as with a leak. They will also come on automatically if the psi gets too low, though ideally you should take control of your brakes before the situation reaches this point.
When should you drain your air tanks?
Unless your vehicle automatically drains the air tanks, you should drain them at the end of each working day so that the moisture and oil do not freeze or coagulate and cause your brakes to then fail.
Which of the follow you should do before leaving your vehicle unattended?
In order to make sure that your truck will be safe when you leave it unattended, you must put on the parking brake and chock the wheels. Removing your keys is a simple safety tip for any vehicle, even a passenger car.
Which conditions are front wheel brakes good under?
Front wheel brakes have been shown to be ideal under all weather and driving conditions, and do not cause skids, even in icy road conditions.
What is the best way to test your vehicle's low air pressure warning signal?
The best way to test the low air pressure warning signal is to turn off the engine of your vehicle while leaving the electric on, then step on and off your brake pedal. The low pressure warning signal should come up when you reduce pressure below 60 psi. You should not need to get down to 30 psi ever.
Which of the following is NOT part of the drum brake?
Drum brakes are on each of your vehicle's axles and contain about 10 different parts, including the axle, slack adjuster, and brake drum itself. While a safety valve is part of an air brake system, it is not part of the drum brake.
Which of the following is true about your brake function if your ABS fails?
Losing the ABS function does not change the basic parts of your truck, so you will still have the same brakes that you have always had. Simply use them, and get the ABS repaired as soon as possible. There is no need to panic, unless your system shows other and more serious warnings.
What is the best way to test if your vehicle's spring brakes come on automatically?
On both tractor-trailer vehicles and single vehicles, you can test whether your vehicle's spring brakes will come on automatically by continuing the same method you use for testing the low air pressure warning signal--stepping on and off your brake pedal, this time until you reach an even lower psi reading and the parking brake valve closes or pops out.
why must you take an exam about air brakes?
You can only receive a CDL with a restriction that allows you to drive only vehicles without air brakes, if you have not studied and passed the section of the CDL exam for air brakes. So, good luck!
Which vehicles must have low air pressure warning signals?
All vehicles on the road that have air brakes must have low air pressure warning signal systems.
The tractor protection valve...
The tractor-trailer protection valve protects your brake system's air supply by providing the air supply, closing automatically if the supply drops too low, and closing if you apply the parking brakes on your vehicle.
Which of the following is NOT part of the air-brake system?
The air brakes are essentially made up of three separate systems: the service brake, the parking brake, and the emergency brake. Before your exam, read your manual to be familiar with what each one does.
Which of the following does ABS do?
ABS does not have a huge effect on your everyday driving in that it neither increases nor decreases your braking capability, nor does it necessarily shorten your actual stopping distance. It just helps you keep your vehicle in control, but it activates when your wheels are about to lock up.
When should you use the parking brake?
You should always use your parking brake with a few rare exceptions: if the brakes are very hot or if they are wet and at risk of freezing.
Which of the following factors can cause brakes to fail or fade?
Brakes fading and failing generally happens from incorrect usage of the brakes, which causes excess heat. This may be from incorrect brake adjustment, not enough reliance on engine braking, excessive use of service brakes, another mechanical reason, or human error.
Slack adjusters are
Slack adjusters are an important part of your air-brake system that allows you to adjust the brakes to ensure that they are safe. They are located in different places, depending upon the type of brakes that you have.
Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with ABS?
When driving a tractor-trailer combination that has ABS, the key is to drive the same way that you have always driven safely. Do not drive any differently because of the ABS. Only use the braking necessary to keep control, pay attention when you slow down, and brake the same regardless of what you're driving. Never speed up, unless it is already part of the safe driving process.
Which of the following is a reason that air tanks must be drained?
Your air tanks hold a mixture of water and compressor oil. If left in to collect at the bottom, the water may freeze and cause brake failure.
How can you tell if your vehicle is equipped with an anti-lock braking system?
Vehicles made after 1998 are required to have anti-lock brakes. They will also have a yellow ABS malfunction lamp.
How do brakes work on a long, steep downgrade?
When it comes to driving down long, steep downgrades, the braking effect of your engine is what's most important, and your brakes are only a supplement to being in the proper low gear. They cannot "correct" your vehicle being in an unsafe high gear without too much pressure on your brakes.
The purpose of a supply pressure gauge is
The supply pressure gauge tells you how much air is in the tank at all times. In some vehicles, it may be connected to a warning bell or light. In others, it might not.
Which of the following is true about a dual air brake system?
A dual air brake system is a system designed for safety and used on most heavy-duty vehicles. It uses one set of controls, where the "primary" system typically operates the rear axle regular brakes and a "secondary" system operates the front axle brakes.
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