5 BASICS
THIS BUILDS UP AND MAINTAINS AIR PRESSURE REQUIRED FOR BRAKING
WHAT IS THE COMPRESSOR?
THIS SHOULD OCCUR AT 60 PSI OR HIGHER
WHAT IS THE LOW AIR WARNING ALARM?
RESERVOIRS SHOULD BE COMPLETELY DRAINED THIS OFTEN
WHAT IS DAILY?
THIS OCCURS WHEN THERE IS MORE HEAT ABSORBED BY THE DRUMS OR ROTORS THAN CAN BE DISSIPATED
WHAT IS BRAKE FAILURE?
THE NORMAL OPERATING TEMPERATURE FOR BRAKE LININGS
WHAT IS 120 DEGREES CELCIUS?
THIS IS USED TO DRAW AIR FROM THE RESERVOIRS TO SLOW AND STOP THE VEHICLE
WHAT IS THE FOOT VALVE?
THIS HAPPENS BETWEEN 120-145 PSI
WHAT IS GOVERNOR CUT-OUT?
THIS ALLOWS AIR TO BE DIRECTED FROM ONE OF TWO SOURCES TO ENSURE THERE IS AIR AVAILABLE FOR BRAKING
WHAT IS A 2 WAY CHECK VALVE?
THIS IS CREATED BY THE FRICTION BETWEEN THE BRAKE SHOE LINING AND BRAKE DRUM
WHAT IS HEAT?
THIS MEASUREMENT IN TIME IS THE DRIVER REACTION TIME
WHAT IS 3/4 TO 1 1/2 SECONDS?
THIS HOUSES A LARGE COMPRESSED SPRING USED TO PARK OR AS AN EMERGENCY BRAKE
WHAT IS A BRAKE CHAMBER?
THIS HAPPENS AT 100 PSI MINIMUM, OR 20-25 PSI LESS THAN THE CUT-OUT PRESSURE
WHAT IS GOVERNOR CUT-IN PRESSURE?
A SAFETY VALVE BLOWING OFF EXCESS PRESSURE INDICATES A PROBLEM WITH THIS
WHAT IS THE GOVERNOR?
THERE SHOULD BE 1/2 INCH TO 3/4 INCH OF PUSH-ROD TRAVEL WHEN CHECKING AND ADJUSTING THIS TYPE OF SLACK ADJUSTER
WHAT IS A MANUAL SLACK ADJUSTER?
VEHICLE SPEED AND WEIGHT ARE DOUBLED, YOUR STOPPING DISTANCE IS NOW INCREASED THIS MANY TIMES
WHAT IS 8?
THIS HOUSES THE COMPRESSED AIR NEEDED FOR BRAKING
WHAT ARE THE RESERVOIRS?
THIS SHOULD BE ABLE TO BUILD PRESSURE FROM 85-100 PSI IN 2 MINUTES OR LESS, WITH SPRING BRAKES APPLIED
WHAT IS THE COMPRESSOR?
APPLYING THE SERVICE BRAKE WHILE THE SPRING BRAKES ARE APPLIED IS CALLED THIS
WHAT IS COMPOUNDING?
NORMALLY, 2-4 BRAKE APPLICATIONS OF NO LESS THAN 100 PSI WILL KEEP THESE TYPES OF SLACK ADJUSTERS IN ADJUSTMENT
WHAT ARE AUTOMATIC SLACK ADJUSTERS?
THIS TEST IS CONDUCTED WITH THE ENGINE RPM BETWEEN 600-800
WHAT IS THE COMPRESSOR BUILD TEST?
THESE ARE THE COMPONENTS AT THE AXLE ENDS
WHAT ARE THE FOUNDATION BRAKES?
WHEN PERFORMING A LEAK TEST, NO MORE THAN ____ PSI CAN BE LOST OVER THE COURSE OF ONE MINUTE ON A TRACTOR TRAILER UNIT
WHAT IS 4 ?
PREVENTING TOTAL BRAKE FAILURE IS THE ADVANTAGE OF HAVING THIS SYSTEM
WHAT IS A DUAL-CIRCUIT AIR SYSTEM?
WHEN CHECKING THE ADJUSTMENT ON AN AUTOMATIC SLACK ADJUSTER BY HAND, IT SHOULD EXTEND THIS MUCH
WHAT IS 1 INCH OR LESS?
THIS IS THE AVERAGE BRAKE LAG TIME IN A PROPERLY MAINTAINED AIR BRAKE SYSTEM
WHAT IS 4/10 OF A SECOND?