Air Brakes

Question 1

The apparatus is equipped with a dual circuit air brake (primary and secondary) system and a ___ spring brake parking system.

Answer 1

rear

Question 2

Antilock Braking System yrs -

Answer 2

2000 - 2009

Question 3

Auxiliary front axle parking brake system on yrs -

Answer 3

2000 - 2009

Question 4

The _____ delivery system of the dual
circuit air brake system supplies air to the front axle service circuit, whereas the ______ delivery system supplies air to the rear axle service circuit.

Answer 4

secondary

primary

Question 5

Air brake operating system pressure for

safe operation is between __ and __ psi.

Answer 5

90 and 120 psi

Question 6

In the event air brake system pressure drops below approximately ___ psi a warning buzzer and light will come on.

Answer 6

65

Question 7

Low air alarm - As soon as system air pressure increases past _____ psi, the warning light and buzzer will shut-off.

Answer 7

65-75

Question 8

When applying the brakes it is recommended that a firm,
constant pressure be applied to the brake pedal as opposed to “pumping” the brake pedal. Pumping the brake pedal may deplete the brake systems air reservoir supply.

Answer 8

reference

Question 9

Air gauge

Primary - what color needle
Secondary - what color needle

Answer 9

Primary = White needle

Secondary = Red needle

Question 10

The apparatus dual circuit air brake system has a quick buildup feature that allows the pressure to be built up in the _______ section first to enable release of the parking brakes before the pressure in the _________ section is adequately charged.

Answer 10

rear brake (primary)

front (secondary)

Question 11

In an emergency situation, operator discretion must be used as to the need to operate the apparatus when there is less than ___ psi air pressure in both brake circuits.

Answer 11

90

Question 12

Use extreme caution when operating the vehicle with either air brake section charged to less than ___ psi or property or personal injury could result.

Answer 12

60

Question 13

The apparatus spring brakes are located on the ___ axle.

Answer 13

rear

Question 14

The spring brakes are applied and released by operation of the yellow Parking Brake valve

Answer 14

reference

Question 15

The parking brake circuit is intended to hold the vehicle in a parked position only and should NEVER be used for normal driving.

Answer 15

reference

Question 16

If air pressure is lost in the rear (primary) service brake section, the spring brakes will be modulated by pressure from the ______ reservoir allowing a few brake applications before the spring brakes are automatically applied.

Answer 16

secondary

Question 17

If air pressure is reduced to approximately ___ psi in both systems, the spring brake valve will automatically apply.

Answer 17

40

Question 18

When parking the apparatus, whether on level terrain or on a grade, always chock the wheels.

It is Department policy to always chock the wheels when on scene.

Answer 18

reference

Question 19

Antilock braking system 2000 - 2009

The antilock braking system (ABS) automatically applies and releases the brakes during low traction or panic brake applications to prevent wheel lock-up. This improves both braking efficiency and steering control.

Answer 19

reference

Question 20

The ABS system is integral to the air brake system and therefore cannot be turned off or overridden. There is no ON or OFF switch for the ABS.

Answer 20

reference

Question 21

When braking, always maintain a ____ steady pressure on the brake foot pedal to achieve the necessary change in speed or to bring the apparatus to a complete stop.

Answer 21

firm

Question 22

Rapid pumping of the brakes may deplete air pressure faster than the air compressor can supply it resulting in a loss of braking ability as well as decreasing the efficiency of the ABS system.

Answer 22

reference

Question 23

When the ABS applies the Telma Retarder is automatically

_______.

Answer 23

deactivated

Question 24

2000 - 2009

The auxiliary front wheel lock feature uses air brake system pressure to keep the front brakes applied. It is used to augment the rear spring parking brakes in the
event the rear parking brakes cannot hold the apparatus on a steep incline.

Answer 24

reference

Question 25

if there is an air leak in the air brake system, the auxiliary front wheel locks may fail. Therefore, if the auxiliary parking brake is to be used, it should be used only with the engine _____.

Answer 25

running

Question 26

Auxiliary front wheel lock - It is a supplemental brake only, which does not meet the FMVSS (Federal Motor Vehicle Safety Standards) parking brake criteria and must be used in conjunction with the yellow parking brake valve when parking the vehicle.

Answer 26

reference

Question 27

To apply the auxiliary front wheel lock the spring brakes MUST be applied first. In order to apply, first pull out the yellow parking brake knob and then push in the black auxiliary brake knob.

Answer 27

reference