Class D -3- Braking Systems - Level 4 | Führerschein Österreich

Class D -3- Braking Systems - Level 4

4 of 4 Levels

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Category: Class D -3- Braking Systems - Level 4

Buses for scheduled transport can be equipped with a bus stop brake. How can this brake be operated?

Automatically by the pneumatic opening or closing of the doors

Automatically by the one-sided lowering or raising of the bus when opening the doors ("kneeling")

By a switch on the dashboard

The operation is automatic when the brake pedal is pressed

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Category: Class D -3- Braking Systems - Level 4

What possibilities are there to release the spring brake system of a bus when the reservoir pressure is too low?

By external air supply

By hydraulic activation

By manual release

By switching to an emergency release device that uses the vehicle's own compressed air

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Category: Class D -3- Braking Systems - Level 4

Buses for scheduled transport can be equipped with a bus stop brake. What happens when it is operated?

Pressure is released from the diaphragm brake cylinders of the rear axle. The spring brake cylinders are vented

The wheel brakes are operated electrically with servo motors

The wheel brakes are operated pneumatically with servo motors

Pressure is metered into the diaphragm brake cylinders of the rear axle. The spring brake cylinders are not vented

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Category: Class D -3- Braking Systems - Level 4

You are driving your bus. This warning light comes on. How should you behave?

I check whether all passengers have fastened their seat belts

I continue until the next red traffic light and check the doors there

I stop at a suitable location and check the doors

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

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Category: Class D -3- Braking Systems - Level 4

Which of the listed devices are retarder systems in commercial vehicles?

Electromagnetic retarders (eddy current brakes)

Hydraulic retarders (hydrodynamic brakes)

Tristop cylinders

Engine compression brakes with exhaust flap

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Category: Class D -3- Braking Systems - Level 4

Your bus is equipped with a compressed-air operated hydraulic brake system. How can you check with this brake system whether the hydraulic part remains tight under load?

I press the brake pedal to half the possible pedal travel for about 5 seconds. The brake lights must not come on

I press the brake pedal to the floor of the bus for about 30 seconds. No brake fluid must escape

I press the brake pedal to the floor of the bus for about 30 seconds. There must be no pressure drop in the reservoirs of the compressed air system

I press the brake pedal several times with the engine off. If I then start the engine, the brake pedal must give slightly

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Category: Class D -3- Braking Systems - Level 4

What advantages does it have that the spring brake system of a bus is applied by pressure drop and not by metering compressed air?

If the compressed air supply of the brake system completely escapes during driving, emergency braking is still possible with the spring brake system

The compressed air consumption is lower

If the reservoir pressure in the bus brake system is too low, the bus remains braked

The wheel brakes remain braked even when the reservoir pressure in the bus brake system drops

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Category: Class D -3- Braking Systems - Level 4

You are driving your bus. This warning light comes on. What does this mean?

That a luggage compartment door is open

That the air conditioning is malfunctioning

That a door of the bus is not properly closed

That a flap on the engine is open

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Category: Class D -3- Braking Systems - Level 4

You operate the spring brake system of a bus. What activates the wheel brake?

By releasing an electromagnet, the storage spring operates the wheel brake

By metering compressed air into the spring brake cylinder

By pressure drop in the spring brake cylinder, the storage spring operates the wheel brake

By releasing a hydraulic valve, the storage spring operates the wheel brake

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Category: Class D -3- Braking Systems - Level 4

You are checking the tightness of the brake circuits of your bus's compressed air brake system. When is the system no longer roadworthy?

If the pressure rises by more than 10% of the safety pressure

If the pressure rises by more than 10% of the cut-off pressure

If compressed air is audibly escaping

If a pressure drop is noticeable

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Category: Class D -3- Braking Systems - Level 4

What advantages do electromagnetic and hydraulic retarders have compared to engine compression brakes in driving operation?

They brake the vehicle even when the clutch is disengaged or neutral is selected

They work more quietly

The components are lighter

They are more powerful

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Category: Class D -3- Braking Systems - Level 4

How does the kneeling function of a bus work?

The bus is lowered on one side toward the curb by releasing air from the air suspension

The bus is lowered on both sides by releasing air from the air suspension

The bus is tilted toward the curb by mechanical levers

The bus is lifted on the curb side by inflating the air suspension

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Category: Class D -3- Braking Systems - Level 4

Your bus is equipped with spring brake cylinders. According to the information in the bus operating manual, a tool is required for releasing the spring brake cylinders. What must you then observe?

The required release tool must be shown on request during traffic controls

A certificate about the last official inspection of the release tool must be carried

In this case, no wheel chock needs to be carried

The required release tool must be carried

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Category: Class D -3- Braking Systems - Level 4

Your bus is equipped with a kneeling function. What is the purpose of this function?

To reduce air resistance when driving

To make it easier for passengers to board and alight

To make it easier to drive through low underpasses

To reduce fuel consumption

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Category: Class D -3- Braking Systems - Level 4

What must you observe when using the engine compression brake of your bus?

With an empty vehicle and slippery road, the bus can easily start skidding

With a fully loaded vehicle and good road grip, the bus can start skidding

The braking effect of the engine compression brake depends on the gear engaged

The braking effect of the engine compression brake depends on the engine speed

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Category: Class D -3- Braking Systems - Level 4

Your bus is equipped with an engine compression brake. How does an engine compression brake basically work?

When activated, fuel injection is increased

When activated, the engine is turned off

When activated, a flap in the exhaust is closed against which the engine exhaust gases build up

When activated, the compression pressure in the engine is increased electromagnetically

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Category: Class D -3- Braking Systems - Level 4

Your bus is equipped with a compressed-air operated hydraulic brake system. How does this brake system basically work?

The pressure in the brake fluid is transmitted from the pre-charge cylinder via the brake lines to the wheel brake cylinders

In the wheel brake cylinders, the wheel brakes are activated by the pressure of the brake fluid

When I press the brake pedal, I meter compressed air into the pre-charge cylinders

In the pre-charge cylinders, the brake fluid is pressurized by the metered compressed air

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Class D -3- Braking Systems – Level 4