Class E (Truck) -2- Braking Systems - Level 3

3 of 4 Levels

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Category: Class E (Truck) -2- Braking Systems - Level 3

How can you determine whether the brake pads of the trailer brake system need to be renewed?

By observing the pressure loss during braking

Through a warning light or display on the dashboard of the towing vehicle

For disc brakes, through a visual inspection of the brake pads at the brake caliper

For drum brakes, through a visual inspection of the brake pads through inspection holes in the brake anchor plate

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Category: Class E (Truck) -2- Braking Systems - Level 3

Your towing vehicle has a handbrake valve with a control position. What happens to the brake system of the air-braked trailer when you move the handbrake valve to the parking brake position?

The endurance brake system on the trailer is activated

No brake system on the trailer is activated

The service brake system on the trailer is activated

The parking brake system on the trailer is activated

3 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

You are parking an air-braked vehicle combination for a longer period. The parking brake is applied on the towing vehicle. What effect does it have on the service brake of the trailer if the air supply of the service brake system drops?

Only on the front axle does the service brake release. The service brake on the rear axle brakes

Only on the rear axle does the service brake release. The service brake on the front axle brakes

The service brake of the trailer brakes

The service brake of the trailer releases

4 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

You are driving with your vehicle combination. Suddenly this warning light on the dashboard of the towing vehicle comes on. What can this mean?

The electrical control line for the ABS or EBS is working without faults

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

The electronic control of the brake system on the towing vehicle is faulty

The electronic control of the brake system on the trailer is faulty

5 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

An air-braked trailer separates from the towing vehicle. How is it ensured that the trailer comes to a stop automatically?

This makes the supply line pressureless. This causes the trailer brake valve to brake the trailer

This makes the electrical control line for the ABS of the trailer currentless. This causes the trailer control valve to brake the trailer

This makes the electrical control line for the EBS of the trailer currentless. This causes the trailer brake valve to brake the trailer

This makes the brake line pressureless. This causes the trailer brake valve to brake the trailer

6 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

You are driving with your vehicle combination. Suddenly this warning light on the dashboard of the towing vehicle comes on. How must you behave?

I disconnect the electrical control line for the electronic brake control of the trailer and then continue to the next repair facility

I get professional help and notify the registered owner of the affected vehicle

I stop at a suitable location

I expect that the trailer can skid when braking or push heavily against the towing vehicle

7 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

You are checking the pad thickness of the disc brake on your trailer by visual inspection. At what minimum thickness of the brake pads must they be renewed?

5 mm

I follow the manufacturer's specifications

3 mm

10 mm

8 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

You have stopped after a journey with an air-braked vehicle combination and apply the parking brake on the towing vehicle. What happens then?

The spring brake on the towing vehicle is activated and brakes the towing vehicle

The service brake on the trailer is activated via the yellow brake line and brakes the trailer

The spring brake on the trailer is activated via the red supply line and brakes the trailer

The spring brake on the trailer is activated via the yellow brake line and brakes the trailer

9 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

Your vehicle combination has an air brake system with spring brake. The reservoirs are depressurized. How can you check the filling time of the air brake systems after starting the engine?

The cut-in pressure must be reached in the reservoirs within 45 seconds at the latest

The supply pressure shown on the gauge on the dashboard of the towing vehicle must rise quickly

The cut-off pressure must be reached in the reservoirs within 30 seconds at the latest

I observe the instructions in the operating manual of the towing vehicle for this purpose

10 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

You start the engine of your towing vehicle. This warning light on the dashboard of the towing vehicle comes on for a few seconds and then goes out. What does this mean?

The electronic control of the brake system on the towing vehicle is faulty

The electronic control of the brake system on the towing vehicle is being functionally tested

The electronic control of the brake system on the trailer is being functionally tested

The electronic control of the brake system on the trailer is faulty

11 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

What types of wheel brake cylinders are common on trailers with air brake systems?

Diaphragm brake cylinders

Tristop cylinders

Hydraulic cylinders

Pre-tension cylinders

12 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

You are driving with your vehicle combination. Suddenly this warning light on the dashboard of the towing vehicle comes on. What can this mean?

The electronic control of the brake system on the trailer is faulty

The electronic control of the brake system on the trailer definitely works properly

The trailer is not equipped with ABS or EBS

The electronic control of the brake system on the towing vehicle is faulty

13 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

What are the differences between diaphragm brake cylinders and tristop cylinders of an air brake system?

Diaphragm brake cylinders have no connection for compressed air

Tristop cylinders have two connections for compressed air

Tristop cylinders have no connection for compressed air

Diaphragm brake cylinders have only one connection for compressed air

14 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

You want to park an air-braked vehicle combination for a longer period. How can you secure this vehicle combination against rolling away?

I place at least one wheel chock on the trailer

I definitely apply the parking brake on the towing vehicle

I definitely apply the parking brake on the trailer

I place at least one wheel chock on the towing vehicle

15 / 15

Category: Class E (Truck) -2- Braking Systems - Level 3

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?

0.5 to 0.7 bar

1.5 to 1.7 bar

1.0 to 1.2 bar

0.2 to 0.4 bar

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Class E (Truck) -2- Braking Systems – Level 3