Class C -3- Braking Systems - Level 1 | Führerschein Österreich

Class C -3- Braking Systems - Level 1

1 of 4 Levels

1 / 15

Category: Class C -3- Braking Systems - Level 1

Which components serve for frost protection of a compressed air brake system?

The air dryer

The multi-circuit protection valve

The heating flange

The condensation valve

2 / 15

Category: Class C -3- Braking Systems - Level 1

What is the cut-out pressure of a compressed air brake system?

This is the pressure at which the multi-circuit protection valve switches off a defective supply circuit

This is the pressure from which the compressor no longer delivers air to the supply reservoirs

This is the pressure at which the pressure regulator switches the compressor to load operation

This is the pressure at which the pressure regulator switches the compressor to idle operation

3 / 15

Category: Class C -3- Braking Systems - Level 1

What is the function of the compressor of a compressed air brake system?

It compresses the air necessary for the function of the brake system

It regulates the brake pressure in the wheel brake cylinders depending on the load

It prevents the condensation water from freezing

It regulates the pressure in the tires depending on the load

4 / 15

Category: Class C -3- Braking Systems - Level 1

The pressure regulator of the compressed air brake system of your truck is defective. Therefore, when the cut-out pressure is reached in the supply reservoirs, the compressor is not switched to idle operation. What happens then?

At about 8 bar, the truck brakes automatically

When the pressure reaches a value of about 4 bar above the cut-out pressure, a safety valve opens and releases the overpressure

When the burst pressure is reached, the system bursts

At about 20 bar, the compressor blocks

5 / 15

Category: Class C -3- Braking Systems - Level 1

What can drive the compressor of a compressed air brake system?

By V-belt from the engine

Directly by gears from the engine

By timing belt from the engine

By a power take-off from the transmission

6 / 15

Category: Class C -3- Braking Systems - Level 1

This warning light illuminates on the dashboard of your truck during driving. How should you behave?

I should visit a workshop as soon as possible

I stop as quickly as possible at a suitable location and switch off the engine. Then I have the truck towed

I stop immediately at the right edge of the road. Then I switch off the engine

I switch on the hazard warning lights and secure the truck after stopping

7 / 15

Category: Class C -3- Braking Systems - Level 1

What is the function of the pressure regulator of a compressed air brake system?

It ensures that when the cut-out pressure is reached in the supply reservoirs of the system, the compressor switches to idle operation

It ensures that when the cut-out pressure is reached in the supply reservoirs of the system, the compressor switches to load operation

It ensures that when the cut-in pressure is reached in the supply reservoirs of the system, the compressor switches to idle operation

It ensures that when the cut-in pressure is reached in the supply reservoirs of the system, the compressor switches to load operation

8 / 15

Category: Class C -3- Braking Systems - Level 1

This warning light illuminates on the dashboard of your truck during driving. How should you behave?

I stop immediately and expect that the braking effect is not as strong as usual

After stopping, I read in the operating manual of the truck what behavior rules are provided for this case

After stopping, I perform a complete leak test of the brake system

I drive carefully to the nearest workshop and have the brake system checked there first

9 / 15

Category: Class C -3- Braking Systems - Level 1

Your truck has a compressed air brake system. The supply reservoirs are depressurized. How can you check the function of the compressor after starting the engine?

I follow the specifications in the operating manual of the truck

The cut-out pressure must be reached in the supply reservoirs after 30 seconds at the latest

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

The supply pressure indicated on the pressure gauge on the dashboard must rise quickly

10 / 15

Category: Class C -3- Braking Systems - Level 1

Your truck has a compressed air brake system with spring brake. What can be the cause if the system takes too long to pump up?

The supply reservoirs could be filled with water

The exhaust could be blocked

The compressor could have compression losses

The system could be leaking

11 / 15

Category: Class C -3- Braking Systems - Level 1

How can you check the proper function of the air supply section of the compressed air brake system in your truck?

The cut-off sound of the compressor must be clearly audible during driving

During driving, the supply pressure indicated by the pressure gauge must move between cut-in and cut-out pressure

If the air reservoirs are empty, the supply pressure must rise quickly after starting the vehicle engine

The venting of the air reservoirs must be clearly audible at regular intervals during driving

12 / 15

Category: Class C -3- Braking Systems - Level 1

What is the cut-in pressure of a compressed air brake system?

This is the pressure at which the pressure regulator releases the air delivered by the compressor into the open

This is the pressure at which the pressure regulator lets the air delivered by the compressor flow back into the air reservoirs

This is the pressure at which the pressure regulator switches the compressor back to load operation

This is the pressure at which the pressure regulator switches the compressor to idle operation

13 / 15

Category: Class C -3- Braking Systems - Level 1

This warning light illuminates on the dashboard of your truck. What does this mean?

That the brake pads have become wet

That the ABS is malfunctioning

That the brake pads are worn

That the supply pressure in the air reservoirs of the brake system is too low

14 / 15

Category: Class C -3- Braking Systems - Level 1

Which of the listed parts belong to the air supply section of a compressed air brake system of a truck?

The compressor

The wheel brake cylinders

The pressure regulator

The frost protection device

15 / 15

Category: Class C -3- Braking Systems - Level 1

This warning light illuminates on the dashboard of your truck during driving. What can this mean?

That part of the brake system has failed

That the supply pressure in the air reservoirs of the brake system is too low

That the brake light has failed

That the brake pads have overheated

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Class C -3- Braking Systems – Level 1