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

2 of 4 Levels

1 / 15

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

You are driving an air-braked vehicle combination. You have stopped because the supply line to the trailer has become leaky. How should you behave?

I only uncouple the leaky line. Then I release the air brake of the trailer and continue at a maximum of 40 km/h to the next repair facility

I get professional help to repair the damage

If I have suitable tools and spare parts, I can repair the damage myself

I uncouple both lines of the air brake of the trailer. Then I release the air brake of the trailer and continue at a maximum of 40 km/h to the next repair facility

2 / 15

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

An air-braked trailer is parked without a towing vehicle. You want to release the air brake on this trailer. What sensible options do you have for this?

A pressure relief valve on the brake air reservoir

A release valve

An emergency release device on the tristop cylinders

A brake valve

3 / 15

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

You are checking the service brake of an air-braked vehicle combination. You fully press the brake pedal and find that the pressure drop is 3 bar. How should you behave?

I get professional help to repair the damage

I wedge the brake pedal in full braking position. Then I walk around the vehicle combination and listen for hissing sounds

I notify the registered owner of the vehicle about this serious defect

I drive at up to 40 km/h to the next repair facility. I turn on the hazard warning lights

4 / 15

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

A trailer can be loaded with different weights. Is the braking effect of an air-braked trailer adjusted depending on its loading condition?

Yes, but only for multi-axle trailers

Yes, but only for semi-trailers

Yes

5 / 15

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

You are checking the service brake of an air-braked vehicle combination. You fully press the brake pedal and notice that distinct hissing sounds can be heard for a longer period. How should you behave?

I drive at up to 30 km/h to the next repair facility. I avoid emergency braking

I get professional help to repair the damage

I continue driving until the next regular service of the towing vehicle, but avoid emergency braking

I notify the registered owner of the affected vehicle about this serious defect

6 / 15

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

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

When the parking brake is applied on the towing vehicle

Only as long as the parking brake is applied on the trailer

Only as long as full braking is applied on the towing vehicle

When the service brake is applied on the towing vehicle

7 / 15

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

You are driving an air-braked vehicle combination. During the journey, the brake line to the trailer becomes leaky. What does this cause?

Only when the service brake is applied on the towing vehicle does a pressure drop occur in the supply line to the trailer via the leaky brake line. This causes the trailer brake valve to brake the trailer

There is an immediate pressure increase in the line. This causes the trailer brake valve to brake the trailer

There is an immediate pressure drop in the line. This causes the trailer brake valve to brake the trailer

There is an immediate pressure drop in the supply section of the air brake system of the towing vehicle. This causes the supply pressure on the towing vehicle to drop to the safety pressure

8 / 15

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

You are driving an air-braked vehicle combination. You have stopped because the brake line to the trailer has become leaky. How should you behave?

I get professional help to repair the damage

I uncouple both lines of the air brake of the trailer. Then I release the air brake of the trailer and continue at a maximum of 40 km/h to the next repair facility

I only uncouple the leaky line. Then I release the air brake of the trailer and continue at a maximum of 40 km/h to the next repair facility

If I have suitable tools and spare parts, I can repair the damage myself

9 / 15

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

You are driving an air-braked vehicle combination. During the journey, the supply line to the trailer becomes leaky. What does this cause?

There is an immediate pressure drop in the line. This causes the trailer brake valve to brake the trailer

There is an immediate pressure drop in the supply section of the air brake system of the towing vehicle. This causes the supply pressure on the towing vehicle to drop to the safety pressure

Only when braking does a pressure drop occur in the supply section of the air brake system of the towing vehicle. This causes the supply pressure on the towing vehicle to drop to the safety pressure

There is an immediate pressure drop in the supply section of the air brake system of the towing vehicle. This causes the supply pressure on the towing vehicle to drop to zero. The towing vehicle can no longer be braked with the air brake

10 / 15

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

You are checking the service brake of an air-braked vehicle combination. What should be the maximum pressure drop on the gauge on the dashboard of the towing vehicle when you fully press the brake pedal?

0.1 to 0.2 bar

0.5 to 0.7 bar

2.0 to 2.2 bar

1.4 to 1.6 bar

11 / 15

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

Your vehicle combination is equipped with an electronically controlled braking system (EBS). What advantages does this have compared to an air brake system without EBS?

No pushing forces from the trailer occur on the towing vehicle via the drawbar when braking

The stopping distance is shortened

The trailer brake responds practically simultaneously with the service brake of the towing vehicle

The brake systems of the towing vehicle and trailer automatically coordinate their braking effect

12 / 15

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

You want to couple a trailer that is equipped with an electronically controlled braking system (EBS). What do you pay attention to?

It is sufficient if the towing vehicle only has an air brake system. ABS or EBS are then not necessary

It is sufficient if the towing vehicle only has an anti-lock braking system (ABS). EBS is then not necessary

It is sufficient if the towing vehicle only has a connection for lift hydraulics

The towing vehicle must definitely be equipped with an electronically controlled braking system (EBS)

13 / 15

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

Your trailer is equipped with an electronically controlled braking system (EBS). How is the braking force coordinated between trailer and towing vehicle?

The coordination of the braking force is done automatically by the electronically controlled braking system (EBS)

It is necessary to release compressed air from the reservoir on the towing vehicle before departure

It is absolutely necessary to weigh the vehicles before starting the journey

It is necessary to correctly set a release valve on the trailer according to the loading condition

14 / 15

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

You have coupled a trailer to a towing vehicle and want to start driving. This warning light on the dashboard of the towing vehicle comes on. How should you behave?

If the trailer is not equipped with ABS or EBS, I avoid hard braking, especially on slippery road conditions

If the trailer is not equipped with ABS or EBS, I expect that the tires of the trailer can lock up when braking

If the trailer is not equipped with ABS or EBS, I avoid hard braking, especially when the trailer is empty

Before driving off, I check whether the electrical control line for the ABS or EBS of the trailer was properly connected to the towing vehicle

15 / 15

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

You have coupled a trailer to a towing vehicle and want to start driving. What can it mean if this warning light on the dashboard of the towing vehicle comes on?

The trailer is not equipped with electronic control of the service brake system (ABS or EBS)

The electrical control line for the ABS or EBS of the trailer is interrupted

The electrical control line for the ABS or EBS of the trailer was not properly connected to the towing vehicle

The air brake system of the trailer is only controlled electrically

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