Class E (Truck) -2- Braking Systems - Level 1

1 of 4 Levels

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Category: Class E (Truck) -2- Braking Systems - Level 1

What is the purpose of the supply line in the air brake system of a trailer?

It ensures automatic release of the air brake of the trailer when it is uncoupled from the towing vehicle

It ensures automatic braking of the trailer if it breaks away from the towing vehicle

It triggers braking on the trailer when the service brake or parking brake is applied on the towing vehicle

It enables the trailer to be supplied with compressed air from the towing vehicle

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Category: Class E (Truck) -2- Braking Systems - Level 1

You want to couple an air-braked trailer. The color marking of the coupling heads is not recognizable. Which of the two coupling heads is the one for the supply line when you are standing behind the towing vehicle?

Always the left one

This depends on whether the towing vehicle is right-hand or left-hand drive. The coupling head for the supply line is on that side

This is not specified

Always the right one

3 / 15

Category: Class E (Truck) -2- Braking Systems - Level 1

What is the purpose of the brake line in the air brake system of a trailer?

It ensures automatic braking of the trailer if it breaks away from the towing vehicle

It triggers braking on the trailer when the service brake or parking brake is applied on the towing vehicle

It enables the trailer to be supplied with compressed air from the towing vehicle

It ensures automatic braking of the trailer when it is uncoupled from the towing vehicle

4 / 15

Category: Class E (Truck) -2- Braking Systems - Level 1

The handbrake valve in the towing vehicle has a test or control position. What does this position do?

The service brake system of the trailer brakes, the service brake system of the towing vehicle is also activated

The service brake system of the trailer is released, the spring brake system of the towing vehicle remains released

The service brake system of the trailer is released, the spring brake system of the towing vehicle remains braked

The service brake system of the trailer brakes, the spring brake system of the towing vehicle also brakes

5 / 15

Category: Class E (Truck) -2- Braking Systems - Level 1

You have coupled an air-braked trailer. When is the brake line under pressure?

Only as long as braking is not applied on the towing vehicle

When the parking brake is applied on the towing vehicle

When the service brake is applied on the towing vehicle

Only when the trailer is equipped with an endurance brake

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Category: Class E (Truck) -2- Braking Systems - Level 1

Filters are installed in the connecting lines of an air-braked trailer. Why is it important that these filters are functional?

To prevent moisture from entering the trailer brake system

To prevent malfunctions caused by dirt entering the trailer brake system

To prevent compressed air from entering the trailer brake system

To prevent dirt from entering the trailer brake system

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Category: Class E (Truck) -2- Braking Systems - Level 1

You want to couple an air-braked trailer. What color marking does the coupling head for the supply line have?

Black

Red

Yellow

White

8 / 15

Category: Class E (Truck) -2- Braking Systems - Level 1

Filters are installed in the connecting lines of an air-braked trailer. What maintenance work must you perform on these filters?

The filter elements must be replaced if they are damaged

The filter elements must be cleaned if they are contaminated

The filters must be provided with antifreeze at temperatures below 5°C

The filter elements must be regularly checked for contamination

9 / 15

Category: Class E (Truck) -2- Braking Systems - Level 1

What is the purpose of the brake line in the air brake system of a trailer?

It triggers braking on the trailer when the service brake or parking brake is applied on the towing vehicle

It triggers braking on the towing vehicle when the parking brake is applied on the trailer

It enables the trailer to be supplied with compressed air from the towing vehicle

It ensures automatic braking of the trailer if it breaks away from the towing vehicle

10 / 15

Category: Class E (Truck) -2- Braking Systems - Level 1

You have coupled an air-braked trailer. When is the supply line under pressure?

Only as long as there is pressure in the brake line to the trailer

Only as long as braking is not applied on the towing vehicle

Only as long as braking is applied on the towing vehicle

As long as there is sufficient supply pressure in the assigned supply circuit on the towing vehicle

11 / 15

Category: Class E (Truck) -2- Braking Systems - Level 1

You want to couple an air-braked trailer. The color marking of the coupling heads is not recognizable. Which of the two coupling heads is the one for the brake line when you are standing behind the towing vehicle?

This depends on whether the towing vehicle is right-hand or left-hand drive. The coupling head for the brake line is on that side

Always the left one

Always the right one

This is not specified

12 / 15

Category: Class E (Truck) -2- Braking Systems - Level 1

What is the purpose of the supply line in the air brake system of a trailer?

It triggers braking on the trailer when the service brake or parking brake is applied on the towing vehicle

It ensures automatic braking of the trailer if it breaks away from the towing vehicle

It enables the trailer to be supplied with compressed air from the towing vehicle

It ensures automatic release of the air brake of the trailer when it is uncoupled from the towing vehicle

13 / 15

Category: Class E (Truck) -2- Braking Systems - Level 1

This is not specified

Always the right one

This depends on whether the towing vehicle is right-hand or left-hand drive. The coupling head for the brake line is on that side

Always the left one

14 / 15

Category: Class E (Truck) -2- Braking Systems - Level 1

You want to couple an air-braked trailer. What color marking does the coupling head for the brake line have?

Black

Red

Yellow

White

15 / 15

Category: Class E (Truck) -2- Braking Systems - Level 1

The handbrake valve in the towing vehicle has a test or control position. What is this position for?

It can be used to check whether the service brake system of the trailer alone is able to hold the weight of the entire vehicle combination on a gradient or incline when parked

It can be used to check whether the spring brake system of the towing vehicle alone is able to hold the weight of the entire vehicle combination on a gradient or incline when parked

It can be used to check whether the vehicle combination remains safely stationary on a gradient or incline even if the entire compressed air supply fails

It can be used to check whether the spring brake system of the trailer alone is able to hold the weight of the entire vehicle combination on a gradient or incline when parked

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Class E (Truck) -2- Braking Systems – Level 1