Air Breaks

Question 1

Your truck or bus has a dual air break system. If low air pressure warning comes on for only one system, what should you do?

Answer 1

Stop. Safely park, and continue only after the system is fixed

Question 2

If your vehicle has an alcohol evaporator, everyday during cold weather you should?

Answer 2

Check and fill the alcohol level

Question 3

Compressed air is stored in the

Answer 3

I’m the storage tank

Question 4

A straight truck or bus air break system should not leak at a rate of…. Per minutes with the engine off and the breaks released

Answer 4

2PSI per minute

Question 5

When a safety valve releases air it means that..
-the pressure has exceeded 150 psi
-too much air is in the air compressor
-something is wrong, and you should have it checked by a mechanic

Answer 5

All of the above

Question 6

You should know your breaks are fading when

Answer 6

You have to push harder on the break pedal to control your speed and to downgrade

Question 7

The air compressor governor controls

Answer 7

When the air compressor pumps air into the storage tanks

Question 8

An air tanks is equipped with a drain valve to remove

Answer 8

Water and oil

Question 9

To check the slack adjuster on S cam breaks, you should

Answer 9

Wear gloves and pull hard on each slack adjuster

Question 10

To check the free play of manual slack adjusters on a cam breaks you should

Answer 10

Park on level ground, chock the wheels and release the parking breaks

Question 11

The application pressure valve shows the driver how much pressure

Answer 11

Is being applied to the breaks

Question 12

If your air compressor stops working

Answer 12

You will still have air pressure in your tanks

Question 13

Your vehicle single break system needs adjustment if

Answer 13

If the compressor cuts out between 70 to 90 psi

Question 14

Air breaks take longer to stop that hydraulic breaks because

Answer 14

It takes longer for air to flow through the line

Question 15

When low pressure warning is activated, you should

Answer 15

Bring the vehicle to a safe stop while you can still control the breaks

Question 16

If your truck or bus has dual parking control valves it means that you can use pressure from a separate tank to

Answer 16

Release the spring breaks to move a short distance

Question 17

Slack adjusters….

Answer 17

Can be adjusted manually or automatically

Question 18

You should not use the parking breaks

Answer 18

When parking breaks are hot

Question 19

What can legally hold a parking or emergency break in position for a truck, truck tractor or bus?

Answer 19

Spring pressure

Question 20

In air break vehicles the parking breaks should be used when

Answer 20

Whenever the vehicle is parked

Question 21

The air pressure governor controls

Answer 21

When air is pumped into the air tanks

Question 22

The most common types of foundation breaks found in heavy vehicles is the

Answer 22

S-cam drum

Question 23

If the air compressor should develop a leak, what keeps the air in the tanks

Answer 23

The one way check valve

Question 24

The proper way to go down long grades is to……?

Answer 24

Use a low gear and apply light pressure on the breaks

Question 25

Break drums………
-are bolted to the wheels
-are located at each end of the vehicles axels
-hold the brake shoes and lining.

Answer 25

ALL OF THE ABOVE