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Air Brake Test

33 Questions
Automobile Quizzes & Trivia

CDL-AIR BRAKE TEST

Questions and Answers
  • 1. 
    WHICH BRAKE SYSTEM APPLIES AND RELEASES THE BRAKES WHEN THE DRIVER USES THE BRAKE PEDAL?
    • A. 

      EMERGENCY

    • B. 

      PARKING

    • C. 

      DRUM

    • D. 

      DUAL

  • 2. 
    MODERN AIR BRAKES ARE A COMBINATION OF SERVICE, PARKING, AND WHAT OTHER BRAKE SYSTEM?
    • A. 

      HAND

    • B. 

      EMERGENCY

    • C. 

      DRUM

    • D. 

      DUAL

  • 3. 
    WHAT DOES THE AIR COMPRESSOR GOVERN CONTROL?
    • A. 

      THE BRAKE CHAMBER RELEASE PRESSURE

    • B. 

      AIR PRESSURE APPLIED TO THE BRAKES

    • C. 

      AIR COMPRESSOR SPEED

    • D. 

      AIR PUMPED INTO THE AIR TANKS

  • 4. 
    WHY SHOULD YOU DRAIN WATER FROM COMPRESSED AIR TANKS?
    • A. 

      WATER CAN FREEZE AND CAUSE BRAKE FAILURE

    • B. 

      WATER COOLS THE COMPRESSOR EXCESSIVELY

    • C. 

      WATER CAN GET IN TO THE OUT OF THE COMPRESSOR

    • D. 

      WATER MIXED WITH OIL CAUSES BRAKE OVERHEATING

  • 5. 
    WHAT IS THE PURPOSE OF AN ALCOHOL EVAPORATOR?
    • A. 

      ELIMINATES NEED FOR TANK DRAINING

    • B. 

      BOOSTS TANK PRESSURE

    • C. 

      REDUCES THE RISK OF ICE IN AIR BRAKE VALVES

    • D. 

      ELIMINATES ALCOHOL THAT CONDENSES IN THE AIR TANK

  • 6. 
    FOR VEHICLES WITH AN ALCOHOL EVAPORATOR, WHAT SHOULD YOU DO EVERY DAY DURING COLD WEATHER?
    • A. 

      REMOVE THE EVAPORATED ALCOHOL

    • B. 

      CHECK THE ALCOHOL FOR OIL

    • C. 

      CHECK AND FILL THE ALCOHOL LEVEL

    • D. 

      CLEAN THE EVAPORATOR AIR FILTER

  • 7. 
    WHAT DOES THE BRAKE PEDAL DO IN AN AIR BRAKE SYSTEM?
    • A. 

      CONNECTS THE SHOCK ADJUSTERS BY RODS AND LINKAGES

    • B. 

      CONTROLS THE AIR PRESSURE APPLIED TO THE BRAKES

    • C. 

      CONNECTS THE SERVICE AND PARKING BRAKE SYSTEMS

    • D. 

      CONNECTS THE SERVICE AND EMERGENCY BRAKE SYSTEMS

  • 8. 
    THE MOST COMMON TYPE OF FOUNDATION BRAKE IS THE:
    • A. 

      WEDGE DRUM BRAKE

    • B. 

      S-CAM DRUM BRAKE

    • C. 

      DUAL DISC BRAKE

    • D. 

      DISC BRAKE

  • 9. 
    ALL AIR BRAKE EQUIPPED VEHICLES HAVE:
    • A. 

      AIR SUPPLY PRESSURE GAUGE

    • B. 

      A HYDRAULIC SYSTEM

    • C. 

      AT LEAST ONE BRAKE HEATER

    • D. 

      AN AIR USE GAUGE

  • 10. 
    WHAT DOES THE AIR SUPPLY PRESSURE GAUGE INDICATE?
    • A. 

      HOW MUCH AIR HAS BEEN USED IN THE TRIP

    • B. 

      A HYDRAULIC SYSTEM

    • C. 

      THE PRESSURE IN THE AIR TANK

    • D. 

      THE AMOUNT OF AIR THE AIR TANK CAN TAKE

  • 11. 
    THE APPLICATION PRESSURE GAUGE SHOWS:
    • A. 

      THE AMOUNT OF AIR PRESSURE IN THE AIR TANK

    • B. 

      HOW MUCH AIR PRESSURE YOU ARE APPLYING TO THE BRAKES

    • C. 

      THE PRESSURE APPLIED TO THE BRAKE PEDAL

    • D. 

      THE PRESSURE APPLIED FOR

  • 12. 
    THE DRIVER MUST BE ABLE TO SEE THE AIR PRESSURE WARNING LIGHT COME ON BEFORE THE PRESSURE GETS BELOW:
    • A. 

      40 PSI

    • B. 

      50 PSI

    • C. 

      60 PSI

    • D. 

      80 PSI

  • 13. 
    DURING NORMAL DRIVING, SPRING BRAKES ARE USUALLY HELD BACK BY:
    • A. 

      CENTRIFUGAL FORCE

    • B. 

      SPRING PRESSURE

    • C. 

      AIR PRESSURE

    • D. 

      BOLTS

  • 14. 
    • A. 

      SPRING BRAKE

    • B. 

      SPRING BRAKE

  • 15. 
    WHAT AFFECTS THE POWER OF THE SPRING BRAKES?
    • A. 

      HEAT MAKES THE SPRING BRAKES STRONGER

    • B. 

      THE ADJUSTEMENT OF THE SPRING BRAKES INSURES THE POWER

    • C. 

      THE CONDITION OF THE SERVICE BRAKES

    • D. 

      THE CONDITION OF THE PARKING BRAKES

  • 16. 
    WHAT IS THE PURPOSE OF DUAL PARKING CONTROL VALVES?
    • A. 

      TO APPLY MORE PRESSURE TO THE BRAKES

    • B. 

      TO BALANCE THE SERVICE BRAKE SYSTEM WHEN PARKED

    • C. 

      TO INCREASE PARKING POWER

    • D. 

      TO RELEASE THE SPRING BRAKE IN AN EMERGENCY

  • 17. 
    FOR A DUAL AIR BRAKE EQUIPPED VEHICLE, WHAT SHOULD YOU DO IF THE SECONDARY SYSTEM FAILS?
    • A. 

      CONTINUE TO THE NEXT CONVENIENT PLACE TO STOP

    • B. 

      SLOW DOWN AND CONTINUE USING THE PRIMARY SYSTEM

    • C. 

      DRIVE TO THE NEAREST GARAGE FOR REPAIRS

    • D. 

      BRING THE VEHICLE TO A SAFE STOP, AND GET THE SYSTEM FIXED

  • 18. 
    HOW DO YOU CHECK THE FREE PLAY OF MANUAL SLACK ADJUSTERS ON S-CAM BRAKES?
    • A. 

      PARK ON LEVEL GROUND, CHOCK THE WHEELS, TURN OFF PARKING BRAKES

    • B. 

      PARK ON LEVEL GROUND, SET THE PARKING BRAKES

    • C. 

      SET THE PARKING BRAKE, DRAIN OFF AIR FROM THE SERVICE BRAKE

    • D. 

      PARK ON AN INCLINE, AND SET ONLY THE EMERGENCY BRAKE

  • 19. 
    WHEN TESTING THE LOW PRESSURE WARNING SYSTEM, YOU SHOULD BUILD UP YOUR AIR PRESSURE, AND THEN:
    • A. 

      LEAVE THE ENGINE ON AND STEP HARD ON THE BRAKE

    • B. 

      TURN ELECTRICAL POWER ON AND PUMP BRAKE WITH ENGINE OFF

    • C. 

      TURN ELECTRICAL POWER OFF AND PUMP BRAKE

    • D. 

      TURN THE ENGINE OFF AND STEP HARD ON THE BRAKE

  • 20. 
    WHEN CHECKING THAT THE SPRING BRAKES COME ONE AUTOMATICALLY, THE PARKING BRAKE KNOB SHOULD POP OUT WHEN:
    • A. 

      THE AIR PRESSURE BUILDS UP TO 60 PSI

    • B. 

      THE AIR PRESSURE FALLS TO BETWEEN 20-40 PSI

    • C. 

      YOU STEP ON THE FOOT BRAKE

    • D. 

      ALL OF THE ABOVE

  • 21. 
    A STRAIGHT TRUCK AIR BRAKE SYSTEM WITH THE ENGINE OFF AND THE SERVICE BRAKE RELEASED, SHOULD NOT LEAK AT A RATE GREATER THAN:
    • A. 

      1 PSI PER MINUTE

    • B. 

      2 PSI PER MINUTE

    • C. 

      3 PSI PER MINUTE

    • D. 

      4 PSI PER MINUTE

  • 22. 
    • A. 

      1 PSI IN ONE MINUTE

    • B. 

      1 PSI IN 30 SECONDS

    • C. 

      2 PSI IN ONE MINUTE

    • D. 

      PSI IN ONE MINUTE

  • 23. 
    WHEN TESTING THE SERVICE BRAKES, YOU HAVE A PROBLEM WHEN:
    • A. 

      A DELAYED STOPPING ACTION IS PRESENT

    • B. 

      THE VEHICLE PULLS TO ONE SIDE

    • C. 

      THERE IS AN UNUSUAL FEEL

    • D. 

      ALL OF THE ABOVE

  • 24. 
    HOW SHOULD YOU BRAKE IN AN EMERGENCY STOP?
    • A. 

      USE THE FULL POWER IF THE SERVICE BRAKES

    • B. 

      BRAKE SO THAT YOU CAN STEER AND STAY IN A STRAIGHT LINE

    • C. 

      ALWAYS BRAKE HARD AND FAST

    • D. 

      USE THE EMERGENCY BRAKE AND THE SERVICE BRAKE

  • 25. 
    WHAT IS EMERGENCY STAB BRAKING?
    • A. 

      THE SAME AS SQUEEZE BRAKING

    • B. 

      PUTTING ON THE BRAKES HARD WITHOUT LOCKING THE WHEELS

    • C. 

      REPEATEDLY BRAKING UNTIL THE WHEELS LICK, THEN RELEASING PRESSURE

    • D. 

      BRAKING LIGHTLY SEVERAL TIMES IN A ROW

  • 26. 
    WHY DOES AIR BRAKING TAKE MORE TIME THAN HYDRAULIC BRAKING?
    • A. 

      AIR BRAKES ARE FURTHER FROM THE WHEELS

    • B. 

      AIR BRAKES USE DIFFERENT TYPES OF BRAKE DRUMS

    • C. 

      IT TAKES AIR TIME TO FLOW THROUGH THE LINES

    • D. 

      BECAUSE AN AIR BRAKE SYSTEM HAS THREE SUB-SYSTEMS

  • 27. 
    TOTAL STOPPING DISTANCE FOR AIR BRAKES IS LONGER THAN FOR HYDRAULIC BRAKES DUE TO:
    • A. 

      PERCEPTION DISTANCE

    • B. 

      REACTION DISTANCE

    • C. 

      BRAKE LAG DISTANCE

    • D. 

      EFFECTIVE BRAKING DISTANCE

  • 28. 
    HOW CAN YOU TELL IF YOUR BRAKES ARE FADING ON A LONG DOWNGRADE?
    • A. 

      BRAKE LAG DISTANCE WILL BE SHORTER

    • B. 

      YOU HAVE TO PUSH HARDER TO CONTROL YOUR SPEED

    • C. 

      BRAKES DON'T COOL SUFFICIENTLY BETWEEN APPLICATIONS

    • D. 

      ALL OF THE ABOVE

  • 29. 
    WHY IS SHORTER, LIGHT BRAKE PEDAL PRESSURE USED ON LONG DOWNHILL GRADES INSTEAD ON ON-OFF BRAKING?
    • A. 

      LIGHT PRESSURE DOESN'T HEAT UP THE BRAKES AS FAST

    • B. 

      AIR USAGE IS LESS WITH LIGHT STEADY PRESSURE

    • C. 

      STEADY PRESSURE WORKS BETTER WITH VEHICLE IN LOW GEAR

    • D. 

      ALL OF THE ABOVE

  • 30. 
    THE MOST IMPORTANT THING TO DO WHEN THE LOW AIR PRESSURE WARNING COMES ON IS TO:
    • A. 

      STOP AND PARK AS SOON AS POSSIBLE

    • B. 

      ADJUST THE BRAKE PEDAL FOR MORE SLACK

    • C. 

      USE THE PARKING OR EMERGENCY BRAKE TO STOP

    • D. 

      TAP THE AIR PRESSURE GAUGE TO SEE IF IT IS WORKING

  • 31. 
    IN AN AIR BRAKE VEHICLE, WHEN DO YOU USE THE APRKING BRAKES?
    • A. 

      ONLY DURING PRE AND POST-TRIP INSPECTION

    • B. 

      ONLY IN AN EMERGENCY AND WHEN PARKING

    • C. 

      ANY TIME YOU PARK

    • D. 

      ON DOWNGRADES WITH THE SERVICE BRAKE

  • 32. 
    HOW OFTEN SHOULD YOU DRAIN YOUR AIR TANKS IF IT IS NOT DONE AUTOMATICALLY IN YOUR VEHICLE?
    • A. 

      AT THE END OF EACH DAY OF DRIVING

    • B. 

      EVERY FOUR HOURS OF DRIVING

    • C. 

      AT THE BEGINNING OF EACH DAY OF DRIVING

    • D. 

      AT LEAST ONE WEEK

  • 33. 
    Which axle or axles does the dual air brake system operate?
    • A. 

      Front axle

    • B. 

      Rear axle

    • C. 

      All axles

    • D. 

      Only the trailer axles

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