Section 5- Air Brakes

Question 1

WHAT IS A SUPPLY PRESSURE GAUGE USED FOR?

Answer 1

SHOWS HOW MUCH PRESSURE IS IN THE AIR TANKS

Question 2

ALL VEHICLES WITH AIR BRAKES MUST HAVE A LOW PRESSURE WARNING SIGNAL. TRUE OR FALSE?

Answer 2

TRUE.

*THE WARNING SIGNAL MUST COME ON BEFORE THE AIR PRESSURE IN THE TANKS FALL BELOW 60 PSI. THE WARNING IS USUALLY A RED LIGHT BUT COULD BE A MECHANICAL ARM THAT DIPS INTO YOUR VIEW. (WIG WAG)

Question 3

WHAT ARE SPRING BRAKES?

Answer 3

A MECHANICAL BRAKE ACTIVATOR USED AS AN EMERGENCY AND PARKING BRAKE

Question 4

FRONT WHEEL BRAKES ARE GOOD UNDER ALL CONDITIONS. TRUE OR FALSE?

Answer 4

TRUE

Question 5

HOW DO YOU KNOW IF YOUR VEHICLE IS EQUIPPED WITH ANTILOCK BRAKES?

Answer 5

THE VEHICLE WILL HAVE A YELLOW ABS MALFUNCTION LAMP

Question 6

A _____ _____ _____ SYSTEM HAS TWO SEPARATE AIR BRAKE SYSTEMS, WHICH USE A SINGLE SET OF BRAKE CONTROLS. EACH SYSTEM HAS IT’S OWN AIR TANKS, HOUSES, LINES, ETC. ONE SYSTEM TYPICALLY OPERATES THE REGULAR BRAKES ON THE REAR AXLE OR AXLES WHILE THE OTHER OPERATES ON THE FRONT AXLE.

Answer 6

DUAL AIR BRAKE

Question 7

WHAT ARE SLACK ADJUSTERS?

Answer 7

A SAFETY FEATURE FOUND ON S-CAM BRAKES THAT REDUCES BRAKE SLACK

Question 8

WHAT DOES THIS CHECK FOR?

1) PARK ON LEVEL GROUND AND CHOCK THE WHEELS
2) RELEASE PARKING BRAKE
3) SLACK ADJUSTER MOVEMENT (1” MAXIMUM)

Answer 8

SLACK ADJUSTERS

Question 9

WHAT DOES THIS TEST FOR?

1) SHUT OFF ENGINE
2) TURN ON ELECTRICAL POWER STEP ON AND OFF THE BRAKE PEDAL (BLEED PFF AIR)
3) LOW PRESSURE SIGNAL COMES ON BEFORE PRESSURE DROPS TO LESS THAN 60 PSI IN THE AIR TANK

Answer 9

LOW PRESSURE WARNING SIGNAL

Question 10

WHAT DOES THIS CHECK FOR?

1) PARK ON LEVEL GROUND AND CHOCK THE WHEELS
2) RELEASE THE PARKING BRAKE
3) SHUT OFF ENGINE
4) BLEED OFF AIR AS STATES ABOVE

Answer 10

SPRING BRAKES

Question 11

MATCH: WHAT ARE THE MAXIMUM LEAKAGE RATES FOR VEHICLES?

A) 2 PSI/ MIN BRAKE OFF, 3 PSI/ MIN BRAKE ON

B) 3 PSI/ MIN BRAKE OFF, 4 PSI/MIN BRAKE ON

Answer 11

A) SINGLE VEHICLE

B) COMBINATION VEHICLES

Question 12

WHY SHOULD YOU BE IN THE PROPER GEAR BEFORE STARTING DOWN A HILL?

Answer 12

TO UTILIZE THE BREAKING EFFECT OF THE ENGINE

Question 13

WHAT FACTORS CAN CAUSE BRAKES TO FADE OR FAIL?

Answer 13

EXCESSIVE HEAT CAUSED BY USING BRAKES TOO MICH QND NOT RELYING ON ENGINE BRAKING EFFECT

Question 14

THE USE OF BRAKES ON A LONG, STEEP DOWNGRADE IS ONLY THE SUPPLEMENT TO THE BREAKING EFFECT OF THE ENGINE. TRUE OR FALSE?

Answer 14

TRUE

Question 15

IF YOU ARE AWAY FROM YOUR VEHICLE FOR ONLY A SHORT TIME, YOU DO NOT NEED TO USE THE PARKING BRAKE. TRUE OR FALSE?

Answer 15

FALSE. ALWAYS USE THE PARKING BRAKE UNLESS THE BRAKE ARE VERY HOT OR WET IN FREEZING TEMPERATURES

Question 16

HOW OFTEN SHOULD YOU DRAIN AIR TANKS?

Answer 16

AT THE END OF EACH WORKING DAY UNLESS THE VEHICLE HAS AUTOMATIC AIR TANK DRAINS

Question 17

HOW DO YOU BRAKE WHEN YOU DRIVE A TRACTOR-TRAILER COMBINATION WITH ABS?

Answer 17

AS YOU NORMALLY WOULD BY APPLYING THE NECESSARY BRAKING FORCE TO STOP SAFELY AND STAY IN CONTROL

Question 18

YOU STILL HAVE NORMAL BRAKE FUNCTIONS IF YOUR ABS ARE NOT WORKING. TRUE OR FALSE?

Answer 18

TRUE. DRIVE NORMALLY BUT GET THE SYSTEM SERVICED SOON.

Question 19

WHY MUST AIR TANKS BE DRAINED?

Answer 19

TO EXPEL WATER AND OIL FROM THE COMPRESSED AIR IN THE BRAKE SYSTEM