CA DMV CDL AIR BRAKES PRACTICE

CA DMV CDL AIR BRAKES PRACTICE

TEST CORRECT 100%

Which of the following can cause air brakes to fail or fade?(A) Brakes being out of adjustment (B) Excessive use of the service brakes (C) Not relying on engine braking enough (D) All of the above - ANSWER (D) All of the above 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 - ANSWER (D) At the end of each working day What is the best way to test if your vehicle's spring brakes come on automatically?(A) On tractor trailers, continue to step on and off the brake pedal until the parking brake valve has popped out.(B) One single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.(C) Continue to step on and off the brake pedal until the manufacturer's low psi specification has been met for spring brakes to deploy.(D) All of the above are correct. - ANSWER (D) All of the above are correct 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 - ANSWER (B) Use gloves and pull hard on each slack adjuster you can reach.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 - ANSWER (B) The vehicle was manufactured after 1998 Which of the following should you do before leaving your vehicle unattended? 1 / 2

(A) Put on the parking brakes (B) Chock the wheels (C) Remove the keys (D) Do all of the above - ANSWER (D) Do all of the above 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 - ANSWER (D) all of the above 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 - ANSWER (D) Every time you leave your vehicle, with rare exceptions 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. - ANSWER (D) With the engine off, step on and off the brake pedal to lower the air pressure below 60 psi 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 - ANSWER (D) All of the above are correct 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 - ANSWER (A) All vehicles with air brakes currently in operation

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