New Mexico CDL — Air Brakes Practice Test 7

11.You have just finished inspecting the brake components at one axle on the vehicle inspection test. What does the note in Section 11 tell you to be ready for?

Skipping the remaining axles once the first one has checked outRepeating the inspection on the steering axle and nowhere elseRepeating the same brake inspection at every axle, power unit and trailer alikeRepeating the inspection only if the examiner points out a defect

12.The supply gauge in your late-model straight truck reads 65 psi and is falling, and the low air warning has not come on. Going by Section 5 of New Mexico's manual, is the warning device already overdue?

No; it only has to come on before pressure falls below 60 psiYes; the warning is already late once pressure has dropped anywhere under 100 psiYes; the warning has to come on at the moment the governor cuts the compressor inNo; the warning is not due until the spring brakes have begun to apply themselves

13.A New Mexico applicant scores 92% on the general knowledge test and 76% on the air brakes knowledge test the same day. Under the MVD's passing score rule, where does that leave the air brakes test?

Passed, because the two scores average out to more than the 80% requiredPassed, because 70% is enough on an air brakes testNot passed, because the air brakes test alone requires 90%Not passed; each part is graded on its own and needs 80% or better

14.Section 1 explains the Z restriction, no full air brake equipped CMV. For that restriction, how does it define air over hydraulic brakes?

A system working fully on the air brake principle, with hydraulic lines only as a backupA system working partly on the air brake principle and partly on the hydraulic oneA system working fully on the hydraulic brake principle, with air used only for the suspensionAir brakes on the power unit with hydraulic brakes on the trailer

15.Section 5 mentions chocking the wheels in several places. In which of these situations does it NOT mention wheel chocks?

Testing the low pressure warning signalChecking slack adjusters on s-cam brakesHolding the vehicle while very hot brakes coolRunning the brakes-applied air leakage test

16.Most of the Step 7 final air brake check is done standing still. Which part has you move the vehicle forward at about five mph?

The air leakage rate testThe low pressure warning signal testThe service brake testThe governor cut-in and cut-out check

17.In the Step 7 check, a driver finds that air pressure is building too slowly and plans to let it catch up on the highway. What is the manual's instruction?

Drive, but hold the engine at a fast idle at every stopDrive, and drain the air tanks at the first rest areaDo not drive until the problem has been fixedSet the front brake limiting valve to "slippery" and continue

18.Two controls in the manual's passage on parking brake controls are described as spring-loaded. Which pair is it?

The yellow push-pull parking brake knob, and the trailer hand valve on a combination vehicleThe front brake limiting valve control, and the brake pedal or treadle valveThe manual air tank drain valve, and the safety relief valve on the first tankThe modulating control valve, and the release valve in a set of dual parking control valves

19.You are assigned a truck built in 1990. Based on the manual's statement about automatic slack adjusters, what can you assume about this truck?

Nothing for certain; the manual's statement covers vehicles built since 1994It must have automatic slack adjusters, as every air-braked vehicle on the road doesIt cannot have slack adjusters of any kindIt has automatic slack adjusters that never need to be checked

20.An applicant passes the air brakes knowledge test, then takes the CDL skills test in a truck that has hydraulic brakes. What does Section 1 say about the L restriction?

It goes on the license, because the skills test was not taken in an air-braked vehicleIt does not apply, because passing the knowledge test is what keeps it off the licenseIt is swapped for the Z restriction on full air brakesIt applies only until the license is first renewed