Z Endorsement Test - Quiz 02 (30)

Question 1

You should ascertain whether a trailer uses a spring brake or service brake priority system by…?

Answer 1

Asking your employer or a qualified person

Question 2

The trailer supply valve is usually operated from the dashboard by a control with a knob of which color?

Answer 2

Red

Question 3

Which of these can cause the air pressure to drop and so activate the spring brakes?

Answer 3

Any of them

a. Closing the trailer supply valve
b. A ruptured supply line
c. A disconnected supply line

Question 4

Air brake systems on a trailer have which of these components?

Answer 4

Both of these:

a. Air tanks
b. Automatic spring brakes

Question 5

What is a ‘gladhand’?

Answer 5

A coupling device

Question 6

Which of these statements applies to spring brakes?

Answer 6

They are less powerful than service brakes

Question 7

The tractor protection valve on towing vehicles is designed to do what?

Answer 7

Prevent air loss

Question 8

Trailer hand valves can be used for…?

Answer 8

Normal braking

Question 9

Trailer brake subsystems must apply the spring brakes automatically when the trailer supply line pressure drops below…?

Answer 9

414 kPa (60 psi)

Question 10

In the majority of air brake systems, the parking and emergency brakes are applied by doing what to the control?

Answer 10

Pulling it out

Question 11

A DD3 Safety Actuator has how many air line connections?

Answer 11

Three

Question 12

Service line couplings are usually color coded which color?

Answer 12

Blue

Question 13

The spring brake controls are normally what color?

Answer 13

Yellow

Question 14

Trailer service brakes can be operated by…?

Answer 14

Either of these:

b. The brake pedal
c. A hand valve

Question 15

When the tractor protection valve is opened, it allows air to…?

Answer 15

Flow to the trailer service line

Question 16

Which of these trailers can be towed without waiting for the service brake air tanks to fill?

Answer 16

A trailer with spring brake priority

Question 17

If a spring brake priority trailer loses air to the service brakes, the trailer can only be braked by…?

Answer 17

Closing the trailer supply valve

Question 18

Trailer brake subsystems supply air…?

Answer 18

Either service brakes first or spring brakes first; depending on manufacturer

Question 19

When attaching a trailer, the supply line is usually color-coded what color?

Answer 19

Red

Question 20

You have finished your delivery and unhitched from your trailer. What should you do with the trailer supply valve?

Answer 20

Pull it out

Question 21

Which of these is not the type of foundation brake system?

Answer 21

“V” brakes

Question 22

On which of these vehicles are you most likely to find a DD3 Safety Actuator?

Answer 22

A motorcoach

Question 23

The trailer supply valve will close automatically when air pressure drops below…?

Answer 23

138 - 311 kPa (20 and 45 psi)

Question 24

S” cam brakes use which sort of system?

Answer 24

Drum brakes

Question 25

How many connections must be made to join a trailer’s brake system to the brake system of the towing vehicle?

Answer 25

Two

Question 26

What do the foundation components consist of?

Answer 26

The brake assembly components

Question 27

If you notice that your brake system has caging bolts on it, what should you do?

Answer 27

Have it inspected immediately

Question 28

If trailer lines are cross connected, which of these may happen with the trailer brakes?

Answer 28

a. Any/all of these

b. The towing vehicle may lose air
c. The service brakes will not function properly
d. The spring brakes may not release

Question 29

A caging bolt is used by a technician to do what?

Answer 29

Disable the spring brake chamber

Question 30

To release the spring brakes on a vehicle with a DD3 Safety Actuator, you must operate the control valve and then do what?

Answer 30

Press the brake pedal for 3 to 5 seconds