CA DMV CDL Air Brakes Practice Test Flashcards

CA DMV CDL Air Brakes Practice Test Flashcards Which of the following will be true about your brake function if your ABS fails?(A) It will slow your truck to a halt and force you to pull over.(B) You will sill have normal brake function and will just need to get the ABS repaired soon(C) You will have no brake function, and the truck will be out of control(D) It may cause problems with other mechanical systems and possibly pose a huge fire risk.(B) You will sill have normal brake function and will just need to get the ABS repaired soon Which vehicles must have low air pressure warning signals?(A) All vehicles with air brakes currently in operation(B) None(C) Only those built after 2005(D) Only those built after 2010 (A) All vehicles with air brakes currently in operation An anti-lock braking system (ABS)(A) increases your normal baking capability(B) activates when the wheels are about to lock up(C) decreases your normal capability(D) shortens your stopping distance.(B) activates when the wheels are about to lock up When should you use the parking brake?(A) Only in urban areas where there are many other vehicles(B) Every time you leave your vehicles for any period of time(C) Only if you are away from your vehicle for an extended period of time.(D) Every time you leave your vehicle, with rare exceptions (D) Every time you leave your vehicle, with rare exceptions Spring brakes are(A) brakes that come automatically on a trick or tractor when the psi drops too low(B) not going to take full effect until your psi drops to a certain range, often 20 to 30 psi(C) made up of powerful springs that are held back by air pressure while you are driving(D) all of the above (D) all of the above Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with an anti-lock braking system (ABS)?(A) Brake the same way no

matter what you're driving: a vehicle with ABS, a vehicle

with a trailer, or something else(B) when you slow down, you should monitor your tractor and trailer and ease off the brakes to keep control(C) You should drive more quickly so that you will be able to keep the trailer and tractor straight(D) You should use only the braking necessary to stay safely in control.(C) You should drive more quickly so that you will be able to keep the trailer and tractor straight Why must you study air brakes in the state of California?(A) All trucks have air brakes in California(B) Otherwise, you will have to get a CDL with restrictions(C) Otherwise, you cannot get a CDL at all(D) Otherwise, you cannot get a

CDL permit (B) Otherwise, you will have to get a CDL with restrictions Which of the following is NOT part of the drum brake?(A) Brake drum(B) Slack adjuster(C) Safety valve(D) Return spring (C) Safety valve

How would you check your truck's slack adjusters?(A) Press the brake pedal while listening for any strange noises(B) Use gloves and pull hard on each slack adjuster you can reach.(C) Accelerate and then brake hard(D) All of the above are correct (B) Use gloves and pull hard on each slack adjuster you can reach.Why must air brakes be drained?(A) Your brakes may fail because of water freezing(B) You will drive too quickly if they are not(C) Your transmission fluid may drain out(D) Your left-side bake will cease to operate (A) Your air brakes may fail because of water freezing When should you drain your air tanks?(A) At the end of the month(B) At the end of the fiscal quarter(C) At the end of a trip(D) At the end of each working day (D) At the end of each working day How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?(A) The vehicle was manufactured after 2010(B) The vehicle was manufactured after 1998(C) ABS is still optional(D) The vehicle was manufactured after 2000 (B) The vehicle was manufactured after 1998 Which of the following should you do before leaving your vehicle unattended?(A) Put on the parking brakes(B) Chock the wheels(C) Remove the keys(D) Do all of the above (D) Do all of the above The tractor protection valve(A) closes if you apply the parking brakes(B) provides the air supply for the brake system(C) will close itself automatically if the air supply drops a certain level(D) does all of the above (D) does all of the above What is the best way to test your vehicle's low air pressure warning signal?(A) Pump the brakes while your vehicle is fully on.(B) Pump the brakes until the air pressure drops below 30 psi(C) Manually let the air out of your brakes and see if the signal comes on.(D) With the engine off, step on and off the brake pedal to lower the air pressure below 60 psi.(D) With the engine off, step on and off the brake pedal to lower the air pressure below 60 psi The purpose of a supply pressure gauge is(A) to warn you if there is too little air in the tank(B) to tell you how hot the air in the tank is(C) to tell you how much air is in the tank(D) to do all of the above (C) to tell you how much air is in the tank How do brakes work on a long, steep downgrade?(A) They work as the main braking mechanism, with the engine braking effect as an emergency backup(B) Not applicable; no braking effect is involved in a down a downgrade(C) They work as a supplement to the braking effect of your engine(D) They work as the main braking mechanism (C) They work as a supplement to the braking effect of your engine Which of the following is true about a dual air brake system?(A) Usually, one system operates the front axle and the other system operates the rear axle.(B) One

system is called the "primary" system and the other one is called the "secondary" system.(C) Is uses the single set of brake controls(D) All of the above are correct (D) All of the above are correct What is the best way to test if your vehicle's spring brakes come on automatically?(A) On tractor trailers, continue to