Class D -3- Braking Systems - Level 2 | Führerschein Österreich

Class D -3- Braking Systems - Level 2

2 of 4 Levels

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Category: Class D -3- Braking Systems - Level 2

You start your bus. How can you determine that the compressed air brake system has reached operating pressure?

The warning lights for reservoir pressure on the dashboard go out

The pressure regulator no longer vents

There are warning buzzers that go silent

The spring brake can be released

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Category: Class D -3- Braking Systems - Level 2

How high must the safety pressure of a compressed air brake system be at minimum?

At least 65% of the cut-in pressure

At least 15% of the cut-off pressure

At least 15% of the cut-in pressure

At least 65% of the cut-off pressure

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Category: Class D -3- Braking Systems - Level 2

From which component does a dual-circuit compressed air brake system split into multiple circuits?

From the multi-circuit protection valve

From the pressure regulator

From the tractor brake valve

From the overflow valve

4 / 15

Category: Class D -3- Braking Systems - Level 2

The compressed air brake system of your bus is equipped with an antifreeze pump. What maintenance work must you then perform on the reservoirs of the compressed air system?

Degrease the reservoirs

Drain the condensate

Paint the reservoirs

Manually clean the drain valves

5 / 15

Category: Class D -3- Braking Systems - Level 2

What do you understand by the safety pressure of a compressed air brake system?

This is the pressure with which the bus can still be braked if a leak occurs in one reservoir circuit

This is the pressure that must be present in the bus tires for safe driving

This is the self-stabilization pressure of a compressor

This is the pressure that must be present in the reservoirs of the intact reservoir circuits if a leak occurs in one reservoir circuit

6 / 15

Category: Class D -3- Braking Systems - Level 2

How can you check the function of the multi-circuit protection valve in a compressed air brake system?

By observing the pressure drop on the reservoir pressure gauge when releasing the parking brake

By observing the display behavior on the reservoir pressure gauge during pumping up after a larger pressure loss

By pressing the brake pedal several times in short intervals

By observing the pressure drop on the reservoir pressure gauge during partial braking

7 / 15

Category: Class D -3- Braking Systems - Level 2

How can you recognize that the filter cartridge of the compressed air brake system air dryer needs to be changed?

When condensate comes out when operating the drain valves on the brake system reservoirs

By a corresponding display on the on-board computer

When white smoke comes out of the vehicle exhaust

By a warning light coming on at the dashboard

8 / 15

Category: Class D -3- Braking Systems - Level 2

What is ABS in a bus?

A starting aid

An anti-lock braking system for the vehicle engine

An automatic speed control of the vehicle transmission

An anti-lock braking system for the wheel brakes

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Category: Class D -3- Braking Systems - Level 2

What is the operating pressure in a compressed air brake system?

This is the pressure from which the bus may be driven

This is the pressure that is 50% below the cut-off pressure

This is the pressure that can be reached at most during braking

This is the pressure difference between cut-in and cut-off pressure

10 / 15

Category: Class D -3- Braking Systems - Level 2

What is the task of the multi-circuit protection valve in a compressed air brake system?

It secures the pressure in the compressor if a wheel brake cylinder fails

It secures the pressure of the storage spring in the spring brake cylinder if the service brake system fails

It provides pressure equalization between the individual reservoir circuits

It secures a minimum pressure in the remaining reservoir circuits if one reservoir circuit becomes leaky

11 / 15

Category: Class D -3- Braking Systems - Level 2

What is the task of the air dryer in a compressed air brake system?

It dries the air drawn in by the engine for combusting the fuel

It removes moisture from the air pumped by the compressor

It dries the air compressed by the turbocharger

It prevents the windows in the driver area of the bus from fogging up

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Category: Class D -3- Braking Systems - Level 2

What does the air dryer of a compressed air brake system achieve?

The dry air increases the braking effect

The valves of the compressed air brake system are not contaminated by antifreeze

The dry air reduces compressed air consumption during braking

No condensate reaches the valves of the compressed air brake system

13 / 15

Category: Class D -3- Braking Systems - Level 2

The compressed air brake system of your bus is equipped with an antifreeze pump. How often should you drain the condensate from the reservoirs?

I generally follow the instructions in the operating manual

Daily at outdoor temperatures of 5°C or below

Weekly at outdoor temperatures above 5°C

Once each in spring and autumn

14 / 15

Category: Class D -3- Braking Systems - Level 2

You are checking the function of the multi-circuit protection valve of a compressed air brake system. What pressure must remain in the remaining reservoir circuits when you release the pressure reserve in one circuit?

At least 65% of the cut-off pressure

At least 65% of the cut-in pressure

At least 10% of the cut-in pressure

At least 10% of the cut-off pressure

15 / 15

Category: Class D -3- Braking Systems - Level 2

How does an ABS braking system basically work in a bus?

The ABS control unit measures whether a wheel is starting to lock during braking

If a wheel is starting to lock during braking, the ABS control unit increases the brake pressure on the affected wheel

Speed sensors supply the speed value for each individual wheel to a control unit during braking

If a wheel is starting to lock during braking, the ABS control unit reduces the brake pressure on the affected wheel

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Class D -3- Braking Systems – Level 2