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A duel airbrake system has 2 systems designated: Primary & Secondary
  a) true                       b) false
A: TRUE
A combination Vehicle air brake system cannot leak more than___psi/minute with the engne off & the brakes releasd

     a) 1      b) 2      c) 3      d) 4
C: A COMBO AIR BRAKE SYSTEM MAYN'T LEAK MORE THAN 3psi/minute WITH THE ENGINE OFF & THE BRAKES RELEASED
A straight truck or bus airbrake system cannot leak more than___psi/minute with the engne off & the brakes releasd

      a) 1     b) 2     c) 3     d) 4
B: A STRAIGHT TRUCK OR BUS AIR BRAKE SYSTEM MAYN'T LEAK MORE THAN 2psi/minute WITH THE ENGINE OFF & THE BRAKES RELEASED
A vehicle with a duel airbrake system:
  a) will have only 1 set of brke contrls
  b) will have 2sets of airbrakes
  c) will have only 1 airbrake system
  d) will have 2 primary systems
A: DUEL AIRBRAKE SYSTEMS HAVE ONLY ONE SET OF BRAKE CONTROLS
In a combo truk air presure loss msn't
xceed 1psi/minit while prsure is xerted on the brake pedal
   a) true                         b) false  
B: FALSE: A COMBO TRUCKS MAXIMUM ALLOWABLE AIR PRESSURE LOSS DURING BRAKE PRESSURE EXERTION IS 4psi/minit OR LESS 
Airbrake equipped vehicles must:
  a) never xceed 30psi
  b) have a bkup hydraulic system
  c) have a gauge 2 sho avail air prsure
  d) never have a 1st tank safety valve
C: ALL AIRBRAKE EQUIPPED VEHICLES MUST HAV AN "AIRBRAKE-AVAILABLE AIR-PRESSURE" GAUGE  2 DISPLAY STORED AIR PRESSURE 4 BRAKING
Air loss in a single type truk shudn't xceed___, with engine off & brakes on, (after initial pressure drop)
  a) 1psi/30 seconds   b) 1psi/minit
  c) 2psi/45 seconds   d) 3psi/minit
D: AIRBRAKE AIR-PRESSURE LOSS IN A SINGLE TYPE TRUCK SHOULDN'T EXCEED 3PSI/MINIT, (AFTER INITIAL PRESSURE DROP), WITH THE ENGINE OFF & BRAKES ON
Airbrake air-tanks shud B drained @ lst
  a) every 2 hours or 100 miles
  b) @ each fuel refill stop
  c) Daily
  d) weekly
C: AIRBRAKE SYSTEMS AIRTANKS SHUD B DRAINED OF BUILT-UP WATER & LEAKED BRAK FLUID ON A DAILY BASIS
Airbrakes cool very slowley:
  a) true                    b) false
A: TRUE: AIRBRAKES DO COOL VERY SLOWLEY
The xtra application time of airbrakes due 2 line airflo time ia called:
  a) brake lag
  b) perception time
  c) reaction distance
  d) none of these
A: BRAKE LAG IS THE TERM WHICH REFERS TO THE INCREASE IN TIME IT TAKES 4 BRAKES 2 ACTUALLY RSPOND AND BEGIN 2 CLOSE DUE TO LINE-AIRFLO IN AN AIRBRAKE SYSTEM
@ 55 mph, pavement: dry, airbrake brake-lag time adds ~ 32 feet 2 total stopping distance:
   a) true                       b) false
A: TRUE
Brake fade occurs only on drum brakes:
   a) true                  b) false
B: FALSE: BRAKE FADE CAN OCCUR WITH EITHER DRUM OR DISC TYPE BRAKES
During nrmal oprtion prking & emrgncy brakes R usually held back by:
  a) centrifugal force
  b) spring pressure
  c) air pressure
  d) fluid reserve
C: AIRBRAKE AIR-PRESURE EXERTS PRESSURE ON SPRINGS TO HOLD  BACK PARKING & EMERGENCY BRAKES FROM DEPLOYMENT
Effective braking dist' = the dist' your vehicle travels:
  a) b4 U decide 2 brake
  b) during U'r reaction time
  c) after U step on the brake pedal
  d) after the brakes actually apply
D: EFFECTIVE BRAKING DISTANCE = THE DISTANCE YOUR VEHICLE TRAVELS ONCE THE BRAKES ACTUALLY APPLY
Emergency brakes R activated.....
   a) by the brake pedal
   b) by the "S"-cam
   c) by a loss in air pressure
   d) only when the driver can justify it
C: A DROP IN THE AIR PRESSURE WHICH HOLDS BACK EMERGENCY  & PARKING BRAKES FROM DEPLOYMENT IS THAT WHICH ACTIVATES THEM 
How do U chk "manuel slack adjuster" free play?: a) stop level grnd & apply emgncy brks    b) wth engne idlng, pump brke     c) prk on lvl grnd, & drain off presure-make adjstmnts  d) prk on lvl grnd, chock wheels, release prking brakes & pull on slack adjustrs
D: 2 CHECK SLACK ADJUSTERS: PARK ON LEVEL GROUND, CHOCK WHEELS, RELEASE THE PARKING BRAKE AND LASTLEY: PULL ON SLACK ADJUSTERS
If the air system dvlops a leak, what will keep the air in the reserve tanks?:
   a) the trailer hand valve
   b) the tractor protection valve
   c) shut-off valves
   d) the 1 way check valve
D: IF THE AIRBRAKE SYSTEM DEVELOPS A LEAK IN ITS AIR RESERVE TANKS THE ONE-WAY CHECK VALVE WILL KEEP THEM PRESSUREIZED
A low pressure warning sounds on a duel brake system, U:
  a) must get it fixed within 24 hours
  b) slowdwn, trn.on 4 ways, don't use brakes unless absltly' nec'
  c) chck wrning buzr 2 asure prop func
  d) park & get the airsystem chkd/rprd
D: IF THE LOW PRESSURE WARNING SOUNDS ON A DUEL BRAKE SYSTEM U MUST STOP, PARK & HAVE THE AIR SYSTEM INSPECTED & REPAIRED
If, on a NONduel airbrake system, a rupture ocurs to an emrgncy brake line
  a) the air pressure will drop slowley
  b) U shud aply presre 2 sprng brakes
  c) the spring brakes auto activate
  d) the chck valv actvtes & chcks airlos
C: SPRING BRAKES R BY DESIGN, BACKUPS TO AIRBRAKES. IN CASE OF RAPID PRESSURE LOSS THEY AUTO-ACTIVATE.
On alcohol evaporator equipped vhcls, in winter, U shud:
  a) check &, if need B, fil the evaprator
  b) drain & replace alcohol
  c) omit routine daily air tank drainage
  d) drain accumulated alcohol 
A: ALCOHOL EVAPORATORS PREVENT ICE BUILD-UP IN AIRBRAKE SYSTEMS IN FREEZING WEATHER. ITS RESERVOIR NEEDS PERIODIC CHECKING & TOPPING OFF TO ENSURE ICE-UP PREVENTION
The alcohol evaporators job is to....
  a) rid the systm of alcohol condsation
  b) replace routine daily tank drainage
  c) eliminate carborator icing in winter & vapor-lock in summer
  d) prvnt icing of airbrk tnks, vlves etc
D: ALCOHOL EVAPORATORS PREVENT ICE BUILD-UP IN AIRBRAKE SYSTEMS IN FREEZING WEATHER
Sddenly air systm presre drps, U shud:
  a) allow twice the normal stppg dist'
  b) carry on til' the next repair facility
  c) activate 4 ways & stay undr 45mph
  d) stop as soon as safely possible
D: IF AIRBRAKE SYSTEM PRESSURE SUDDENLY DROPS U SHOULD STOP AS SOON AS SAFELY POSSIBLE AND ASERTAIN &, IF POSSIBLE, CORRECT THE PROBLM B4 MOVING ON
With duel parking control valves, pressure from a seperate tank can:
  a) release emergency triggered spring brakes 2 move vhcle   b) add brake pressure if main tank is low   c) stay parked w.o. tapping service air presur  d) back up the compressor during severe service demands
A: ON A SYSTEM EQUIPPED WITH DUEL PARKING CONTROL VALVES, PRESSURE FROM A SEPERATE TANK CAN BE USED TO RELEASE EMERGENCY AUTO TRIGGERED SPRING BRAKES
If the low pressure warning comes on, U shud stop & park your vehicle as soon as possible:
   a) true                     b) false
A: TRUE
If your vehicle pulls 2 1 side while testing the service brakes, there may be a problem with the service brakes:
   a) true                    b) false
A: TRUE, (OBVIOUSLY)
Airbrke equipd vhcles: the parkng brks
  a) R used whnever U park
  b) R used as seldom as possible
  c) R only used in an emergency
  d) R used 2 slow dwn on steep hills
 
A: WELL DUHHH, THEY ARE CALLED "PARKING" BRAKES
Modern airbrake systems use 3 combind systems called: service, parking & emrgency:
  a) true                     b) false
A: TRUE: MODERN AIRBRAKE SYSTEMS USE 3 COMBINED SYSTEMS: SERVICE, (MANUALLY ENGAGED, AIR PRESSURE POWERED), PARKING BRAKE, (MANUALLY ENGAGED, SPRING POWERED), EMERGENCY BRAKE, (LOW AIR PRESSURE TRIGGERED-AUTOMATICALLY ENGAGED, SPRING POWERED).  
On newer airbrake vhcles, the parking brake control is:
  a) a lever
  b) a square, red, pushpull cntrl knob
  c) a diamond shaped, yellow, pushpull control knob
  d) the blue service air line 
C: ON NEWER AIRBRAKE EQUIPPED VEHICLES. THE PARKING BRAKE CONTROL PRESENTS AS A: "DIAMOND SHAPED-YELLOW-PUSH/PULL" KNOB 
Parking/emergency brakes on C.V.s can B legally held/powered by:
  a) spring pressure
  b) hydraulic pressure
  c) alcohol evaporative fluid
  d) chocking of drive wheels
A: PARKING & EMERGENCY BRAKES ON COMMERCIAL VEHICLES CAN LEGALLY BE HELD, IE: POWERED BY SPRING PRESSURE
Some vehicles have a seperate air tank which can B used 2 release the spring brakes:
  a) true                          b) false
A: TRUE: IN INSTANCES WHERE LOW PRESSURE TRIGGERS THE SPRING ENGAGED EMERGENCY BRAKE, AIR PRESSURE CAN BE USED TO DISENGAGE THEM 2 ENABLE MOVING THE VEHICLE 
Slack adjusters on "S-Cam" equipped brakes need adjusting if their push rod mves mre thn 2 inches whn chckd
   a) true                       b) false 
A: TRUE: IF, WHEN TUGGED ON, THE SLACK ADJUSTERS PUSH RODS TRAVEL MORE THAN 2 INCHES DURING INSPECTION, THEY R IN NEED OF ADJUSTMENT
The air compressor governor controls:
  a) the air compressor speed
  b) the check valve direction
  c) air pressure applied 2 the brakes
  d) whn air will be pumped 2 the tanks
D: THE AIR-COMPRESSOR GOVERNOR CONTROLS AT WHAT PRESSURE LEVEL AIR SHOULD BE PUMPED & STOPPED FROM BEING PUMPED INTO THE RESERVE TANKS
The brake pedal..........
  a) releases excess air supply pressure
  b) engages the spring brakes
  c) cntrols airflow to engage airbrakes
  d) controls air pressure from compressor 2 tank
C: THE BRAKE PEDAL IS USED WHEN U NEED TO ENGAGE THE BRAKES HENCE IT CONTROLS AIR PRESSURE BEING SENT TO/APPLIED TO, THE BRAKES
The braking pwer of the spring brakes:
  a) increases with heat build up
  b) depends on prper brake adjustmnt
  c) isn't affcted by srvice brake condtn
  d) is controlled by the brake pedal
B: THE BRAKING POWER OF THE SPRING BRAKES DEPENDS ON THEIR BEING IN PROPER & BALANCED ADJUSTMENT 
The most common type of foundation brake on heavy C.V.s is:
  a) disc
  b) S-Cam disc
  c) S-Cam drum
  d) air over hydraulic
C: THE MOST COMMON TYPE OF FOUNDATION BRAKE FOUND ON HEAVY COMMERCIAL VEHICLES IS THE S-CAM ACTUATED DRUM CONFIGURATION
THE PURPSE OF ENGNE RETRDERS IS 2:
  a) provide emergency brakes
  b) help slo th vhcle & rduce brak wear
  c) aply xtra brkng pwer 2 nondrv axls
  d) help prevent skids, slips & slides
B: THE PURPOSE OF ENGINE RETARDERS IS TO HELP SLOW THE VEHICLE SO AS TO REDUCE BRAKE HEAT UP & BRAKE WEAR 
The air supply pressure gauge shows how much pressure is ........
  a) needed 4 dependable stopping
  b) available in the air reserve tanks
  c) being sent to the brake chambers
  d) all of the above 
B: THE AIR SUPPLY PRESSURE GAUGE SHOWS THE AVAILABLE PRESSURE IN THE AIR RESERVE TANKS
Spring brakes, or emrgncy brke systm
  a) will always work
  b) only work if properly adjusted
  c) can't B tested by 1 prson alone
  d) rgrdles of adjustmnt, will work rite
B: THE SPRING OR EMERGENCY / PARKING BRAKE SYSTEM CAN ONLY WORK IF PROPERLY ADJUSTED
A visable warning dvice must come on when the air pressure drops below ___psi or, on older vehicles, 1/2 the compressor gov' cutout pressure:
a) 0 psi,  b) 15 psi,  c) 60 psi,  d) 120              e) none of the above 
C: THE VISABLE LOW PRESSURE WARNING DEVICE MUST ACTIVATE WHEN THE PRESSURE DROPS BELOW 60 PSI, OR, ON OLDER VEHICLES, 1/2 THE AIR COMPRESSOR GOVERNOR CUTOUT PRESSURE
Th frnt brake limiting valve shud B usd
  a) under slippery conditions
  b) only on dry roads
  c) only on wet roads
  d) never
D: NEVER: RECENT BRAKING STUDIES HAVE SHOWN LIMITING THE FRONT BRAKES STOPPING POWER THRU THE USE OF FRONT BRAKE LIMITING VALVES IS NOT ADVENTAGEOUS 
Pressure loss rate, (aft init P drop), 4 a strt truck or bus, engine off & brakes on, shud B no more than........
a) 1psi/60 secs      b) 1psi/1 minit
c) 2psi/45 secs      d) 3psi/1 minit
D: ON A STRAIGHT TRUCK OR BUS, WITH THE ENGINE OFF & BRAKES ON, PRESSURE LOSS RATE, (AFTER INITIAL PRESSURE DROP), SHOULD BE NO MORE THAN 3 psi/minute 
The alcohol evaporator condenses the air in the brake system:
  a) true                       b) false
B: FALSE: ALCOHOL EVAPORATORS PREVENT ICE BUILD-UP IN AIRBRAKE SYSTEMS IN FREEZING WEATHER
The most common type of foundation brake is the S-Cam drum
  a) true                     b) false
A: TRUE
The tractor protection valve.........
  a) cannot B operated manuelly
  b) is used 2 drain all air from tractr
  c) is also called the brkaway valve
  d) all of the above
  e) none of the above
C: THE TRACTOR PROTECTION VALVE, ALSO KNOWN AS THE "BREAKAWAY VALVE" EXISTS TO CUT OFF PRESSURE TO THE LINES SUPPLYING AIR TO THE TRAILOR WHEEL BRAKES IN CASE OF LINE LEAKS OR BREAK 
The governor is an air compressor regulator which controls when the air compressor will pump air into the air storage tanks:
  a) true                      b) false
A: TRUE
Total stopping  distance 4 an average driver @ 55mph under good traction & braking conditions is about 150ft:
  a) true                       b) false
B: FALSE: @ 55mph, WITH GOOD TRACTION & BRAKING CONDITIONS, (TAKING INTO CONSIDERATION PERCEP DIST: 60FT,  REAC' DIST: 60FT, STOPNG DIST: 170FT, A.B. AIR TRAVEL TIME:32FT), STOPPING DISTANCE IS ABOUT 290 TO 322 FEET
The emergency brake on a heavy vehicle is usually held in place by spring pressure because air pressure can be lost due to leakage:
   a) true                        b) false
A: TRUE
The 1st tank the air compressor pumps air to has a safety relief valve installed to protect the tank & the rest of the systm from too much pressure:
   a) true                        b) false 
A: TRUE
The braking effects of the engine when going down a long &/or steep dwngrade may B suplmnted wi' brakes:
   a) true                       b) false
A: TRUE
The supply pressure gauge tells U how many ft-pnds is acting on the S-Cam:
   a) true                        b) false
B: FALSE: THE SUPPLY PRESSURE GAUGE REVEALS THE TOTAL BACK UP TANK PRESSURE AVAILABLE FOR DELIVERY TO THE BRAKES
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