Saskatchewan Air Brake Test 04

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1 / 30

If a failure occurs in the primary circuit and a brake application is made, control air from the secondary side of the foot valve is directed to where?

The spring-brake chamber

All of these

A spring-brake modulator

A warning gauge on the dashboard

2 / 30

The only way the vehicle can be moved after all air is lost is to do what?

Repair the damaged circuit and recharge the system, or use the wind-off bolts to compress the power spring

A heavy-duty tow

Electronically release the brakes

Re-start the compressor

3 / 30

Under normal operating conditions the primary reservoir operates which brakes?

The front service brakes

The rear service brakes

All of the service brakes

The driver's side of the service brakes

4 / 30

What is caging the brakes referred to as?

None of these

By using the wind-off bolts to compress the power spring

Adding additional brake lining

By locking the brakes and attempting to turn he wheels

5 / 30

What makes up the tractor protection system?

The trailer-supply valve and tractor protection valve

The slack adjuster and the tractor protection valve

The return spring and the trailer-supply valve

None of these

6 / 30

All discarded spring-brake chambers must be disassembled and disposed of by whom?

The operator

A trained professional

All of these

The driver

7 / 30

During a controlled service brake application, air pressure enters the service port and acts upon the service diaphragm, which does what?

None of he above

Eases pressure from the slack adjuster

Forces the service push plate and rod backward

Forces the service push plate and rod forward, applying force to the slack adjuster

8 / 30

When does compounding the brakes happen?

When half of the service brakes are working

When the rear service brakes are working but the front are not

When the front service brakes are working but the rear are not

When a service brake application is made with the park brake still applied

9 / 30

If air pressure cannot be restored in the service-brake chamber and it is necessary to move the vehicle, the power spring can be compressed manually by the use of...

None of these

A hex bolt

The tighten bolt

A wind-off bolt

10 / 30

Spring brakes are installed in the same manner as service brakes and are always installed where?

On the furthest axle on the rear

On the front tandem axle

On the driver's side

Any axle available

11 / 30

What's the purpose of the dual-circuit air system?

All of these

To supply air to the spring brakes

To provide a more powerful flow of air

To prevent total brake failures

12 / 30

What does the tractor protection system do?

It prevents air loss from the tractor when hooked to a trailer

It prevents air loss from the tractor when not hooked to a trailer or if a trailer breaks away

It prevents air loss from the trailer while parked

It prevents air loss from the tractor when loading a trailer

13 / 30

Spring brakes consist of how many separate air chambers?

One

Four

Three

Two

14 / 30

Release of air in the spring-brake circuit causes the drive axle to do what?

Brake failure

Nothing

Brake using service-brake pressure

Brake using spring-brake pressure

15 / 30

What is referred to as blended air?

When air within the air hoses moves back into the primary tanks

When air taken from the primary and secondary circuits through a two-way check valve

When air in the supply tank blends with outside air

When air from the compressor blends with air already in the supply tank

16 / 30

What happens when you operate the park control valve?

Air remains in the air hoses

Air is exhausted from the spring hold-off cavity

Air builds up into the service reservoir

Air builds up into the brake chamber

17 / 30

The spring brake may begin to drag if the air pressure in the system falls below approximately what pressure?

60 psi

40 psi

50 psi

70 psi

18 / 30

The rear chamber houses a large, powerful compression spring and diaphragm and performs emergency and parking functions, sometimes called...

Tandem duty

Double duty

A piggyback

A leapfrog

19 / 30

Installation of parking brakes and piping arrangements into a vehicle air brake system will vary, depending on...

All of these

The size of vehicle

The type of vehicle

The vehicle make

20 / 30

With a dual-circuit system, pressurized air moves from the supply reservoir to...

Just the secondary reservoir

To whichever tank has the lowest air pressure

The primary reservoir and the secondary reservoir

Just the primary reservoir

21 / 30

When you operate the park control valve, air is exhausted from where?

The return spring

The diaphragm

The spring hold-off cavity

The service push plate

22 / 30

To avoid compounding, the park brake should be...

Fully released after a foot brake application is made

Released before a foot brake application is made

Applied half way

Monitored

23 / 30

At what pressure will the spring brakes apply?

50-65 psi

10-15 psi

20-45 psi

70-80 psi

24 / 30

Where is an anti-compound line sometimes installed?

Between the delivery side of the primary circuit relay valve and the control side of the relay valve operating the spring brakes

None of these

In front of the delivery side of the primary circuit relay valve

Behind the control side of the relay valve operating the spring brakes

25 / 30

What is the purpose of an air pressure gauge?

It informs the driver how much air pressure is in the supply line

It informs the driver how much air pressure is in the primary and secondary reservoirs

It informs the driver how much air pressure is being pumped by the compressor

It informs the driver how much air pressure is in the service line

26 / 30

A two-way check valve allows the source applying the higher pressure to shift the shuttle so that what happens?

The lowest pressure will be shut off

The pressures will become blended

The higher pressure will be directed to the delivery port

The lowest pressure will be directed to the delivery port

27 / 30

Which statement is false? A spring-brake chamber functions as...

A service-brake chamber

A storage for unused air pressure

An emergency brake in case of air-pressure loss somewhere in the system

As a reliable spring-applied parking brake

28 / 30

How many functions does the trailer-supply valve have?

Four

Two

One

Three

29 / 30

What is the minimum pressure at which the tractor protection system must be activated?

15 psi

20 psi

10 psi

5 psi

30 / 30

Spring brakes are a reliable parking brake because...

They are held on by spring pressure and require no air

All of these

They are larger than service brakes

They take less effort to apply

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Saskatchewan Air Brake Test 04

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