Pre-trip Inspection Procedure

13 Questions | Total Attempts: 12

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"D" Pre-Trip Inspection Practical Check List


Questions and Answers
  • 1. 
    Class "D" Pre-Trip InspectionWhat are the (3)"L"s to help you to remember what to look for when doing a pre-trip inspection.
    • A. 

      Loose, leaks, and levels

    • B. 

      Engine oil , engine anti-freeze, windshield washer fluid, power steering fluid, fuel, and battery acid

    • C. 

      Long, length, and loop

  • 2. 
    Air-brake Practical Check list Low-Air Warn Device Test. Trailer Spring Brake (Red) Tractor Spring Brake (Yellow)
    • A. 

      Disconnect service air line (blue)

    • B. 

      Start engine (key must be in the 'on' position)

    • C. 

      primary & secondary air tank pressure gauges is above 80psi(551kPa)

    • D. 

      Release trailer spring brakes (red buttons out)

    • E. 

      Pump the brake pedal and watch and listen for low air warning light and buzzer to activitate

    • F. 

      Watch and listen for air warning device comes on above 55psi. Safe to operate

    • G. 

      When the device activates, note the air pressure displayed by the gauge(s)

    • H. 

      Below 55psi. Not Safe to operate. Park & report

  • 3. 
    Air Brake Practical Check Air Pressure Build-up Test
    • A. 

      Apply trailer spring brakes (red button out) Trailer brakes applied

    • B. 

      Lower air brake system pressure to about 80psi(552kPa)

    • C. 

      Idle engine at 600-900rpm

    • D. 

      Watch the primary and secondary air tank pressure gauges

    • E. 

      Start timing at 85psi(587kPa)

    • F. 

      Stop timing at 100psi(690kPa)

    • G. 

      2 Minutes or Less is a Pass. Vehicle is safe to operate

    • H. 

      More than 2 Minutes is defective Vehicle is not safe to operate. Park & report

  • 4. 
    Tractor Brake Adjustment Check
    • A. 

      (B) Brakes Released (Tractor Spring Brake Valve- Yellow Button Push IN)

    • B. 

      Release the Trailer hand valve

    • C. 

      (A) Adjust Air Pressure (100 psi)

    • D. 

      (T) Truck Engine off

    • E. 

      Exit Vehicle and complete the following sequence

    • F. 

      Circle entire vehicle (left side to right side) listen for air leaks on the supply side of the air brake system and

    • G. 

      Check BRAKE SAFE Indicators. Ensure than in all 4 rear chambers that the red pin is set at "0"

    • H. 

      Enter Vehicle and check: Air Pressure should be 100psi AFTER SUPPLY TEST

    • I. 

      Make and HOLD a full brake application using an assistant or a brake prop. Note the pressure reading on both air pressure gauges

    • J. 

      Exit Vehicle and complete the following sequence:

    • K. 

      Circle entire vehicle (Left side to right side) and listen for air leaks on the service side of air brake system AND

    • L. 

      Check BRAKE SAFE INDICATORS at every chamber that the red pin has not traveled beyond the second yellow mark

    • M. 

      At the rear of the Tractor - Brake lights working. ENTER VEHICLE and check:

    • N. 

      Note air pressure reading on both air pressure gauges: You cannot lose more than 3 psi IN ONE MINUTE

  • 5. 
    CIRCLE CHECK TRACTOR
    • A. 

      Apply Tractor Spring Brakes:

    • B. 

      Turn key to the 'ON" position

    • C. 

      Allow for systems check to cycle

    • D. 

      Start engine(in warmer weather engine can be off)

    • E. 

      Turn on all exterior lights: 1 switch for exterior lights, 1 switch for fog lights, 1 work/flood light, 1 left signal, High beam

  • 6. 
    To test a tractor protection valve, close (pull out) the trailer supply valve, disconnect the trailer service line , and apply the service brakes. At this time, no air should exhaust from the trailer service line. Air exhausting from the service line indicates a defective protection valve. True of False? A vehicle must not be operated?
    • A. 

      Air does not exhaust from the trailer service line

    • B. 

      Air exhausts from the trailer service line

  • 7. 
    Air Pressure Build-up Test To be certain that the air compressor is capable of meeting the demand of the airbrake system and restores airbrake sytem pressure to the normal range quickly, a test is conducted to confirm that the air pressure rise the specified amount within he prescribed time. If a trailer is attached, close the trailer supply valve to ensure accurate test results. If the vehicle has other air operated systems such as air ride suspension be sure to fill theses fully or shut them off so that the test is only measuring the time required for air pressure to rise in the airbrake system. Test the air pressure build-up time by dropping the airbrake system pressure to below 80psi(552kPa). Operate the engine at idle(600 and 900rpm) and observe the time required for the air pressure to rise from 85to100psi(587to690kPa). True of False? If pressure build-up time is equal to or less than two minutes. Is the vehicle safe to operate?
    • A. 

      True.

    • B. 

      False

  • 8. 
    Air Brake Practical Check List Governor cut out
    • A. 

      Start engine

    • B. 

      Idle engine at 600-900rpm

    • C. 

      Watch the primary and secondary air tank pressure gauges

    • D. 

      Run the engine until air brake system reaches its maximum level and note the cut-out pressure setting

    • E. 

      Depress and release the brake pedal several times to lower the system pressure and when the air dryer purges air &/or psi gauge stops rising.

    • F. 

      Cuts out pressure setting is between 100 & 135psi(690-932kPa). Pass.Park & report. Vehicle is safe to operate.

    • G. 

      Cut out pressure Below 100psi or above 135psi. Defective Park & report. vehicle is not safe to operate.

    • H. 

      Governor cut out at ( psi)

  • 9. 
    Airbrake Practical Check List Air compressor Governor cut in
    • A. 

      Normally cuts 20-25psi below cut out

    • B. 

      Normally cuts 30-35psi below cut out

    • C. 

      Lower psi (pump brake pedal)

    • D. 

      Must cut in above 80psi Is good to go

    • E. 

      Cuts in below 80psi or not at all. Park & report

  • 10. 
    Air Brake Practical Check List Tractor Protection Valve Test
    • A. 

      Check the air brake system is within its normal operating pressure 552-932kPa(80-135psi)

    • B. 

      Apply trailer spring brakes (red button out)(closed)

    • C. 

      Push & hold brake pedal down

    • D. 

      Listen for air leaking from the trailer service blue air line glad hand

    • E. 

      Air leaking park & report. Tractor protection valve defective must not operate vehicle

    • F. 

      No leak park & report. Tractor protection valve. Pass. Vehicle is safe to operate

    • G. 

      Reconnect service air line (blue)

  • 11. 
    The pressure is at or above 55psi(380kPa) on both primary and secondary air tank gauges when the device activates. Is the vehicle safe to operate? true or false?
    • A. 

      True

    • B. 

      False

  • 12. 
    During a low air warning device test you reduce the air pressure gauge in the air tanks by pumping the brake pedal until the low air warning device activities. If the low air warning activates below 55psi(380kPa) on either the primary or secondary air pressure gauge and the device fails to activate True or False? Is the vehicle is safe to operate?
    • A. 

      True

    • B. 

      False