Tx Cdl Air Brakes

Front 1

A straight truck or bus with air brake system should not leak at a rate of more than____ Per minute with the engine off.

Back 1

2psi

Front 2

Air braking takes more time than hydraulic braking because air:

Back 2

Takes more time to flow through the lines than hydraulic fluid

Front 3

Modern air breaking systems combine three different systems. They are the service, parking and the ___ brakes.

Back 3

emergency

Front 4

The application pressure gauge shows how much air pressure you:

Back 4

are applying to the brakes

Front 5

If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of the compressed air storage air tanks.

Back 5

At the end of each day of driving.

Front 6

The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:

Back 6

3psi in one minute

Front 7

Your brakes are fading when

Back 7

You have to push harder on the brake pedal to control your speed on a down grade.

Front 8

The supply pressure gauge shows how much pressure:

Back 8

is in the air tanks

Front 9

The brake system that applies and releases the brakes when the driver uses the brake pedal Is the___ brake system

Back 9

service

Front 10

If your vehicle has an alcohol evaporator, every day during cold weather you should:

Back 10

check and fill the alcohol level

Front 11

Why should you drain water from compressed air tanks

Back 11

Water can freeze in cold weather and cause brake failure

Front 12

To test air service brakes, you should:

Back 12

brake firmly when moving slowly forward

Front 13

On long downhill grades, experts recommend using a low gear and light, steady pedal pressure instead of on-again off again braking, Why?

Back 13

Air usage is less with light steady pressure, Brake linings do not heat up as much with light pressure, you can keep vehicle speed consistant in low gear with light, steady pressure

Front 14

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

Back 14

Stop right away and safely park. Contiune only after the system is fixed.

Front 15

During normal driving, spring brakes are usually held back by:

Back 15

Air pressure

Front 16

Total Stopping distance for air brakes is longer than that for hydraulic brakes due to ___ distance.

Back 16

brake lag

Front 17

The most common type of foundation brake found on heavy vehicles is the:

Back 17

S-cam Drum

Front 18

With the air brake vehicles, the parking brake should be used:

Back 18

whenever you leave the vehicle unattended.

Front 19

For emergency stab braking, you should:

Back 19

Press on the brake pedal as hard as you can, release the brakes when the wheels lock, and when the wheels start rolling put the brakes on fully again.

Front 20

Parking or emergency brakes of trucks and buses can be legally held on by_____pressure

Back 20

Spring

Front 21

The driver must be able to see a low air pressure warning, which comes on before pressure in the service air tanks fall below ____ psi.

Back 21

60psi

Front 22

If your vehicle has an alcohol evaporator, it is there to:

Back 22

Reduce the risk of ice in the air brake valves in cold weather.

Front 23

The brake pedal in an air brake system:

Back 23

controls the air pressure applied to put on the brakes.

Front 24

If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:

Back 24

Release the spring emergency / Parking brakes to move a short distance.

Front 25

To check the free play of manual slack adjusters of s-cam brakes, you should park on:

Back 25

Level ground, check the wheels and release the parking brakes.

Front 26

The most important thing to do when a low air pressure warning comes on is:

Back 26

Stop and safely park as soon as possible.

Front 27

The air compressor governor controls:

Back 27

When air is pumped into the air tanks.

Front 28

The braking power of the spring brakes:

Back 28

depends on the service brakes being in adjustment

Front 29

All air brake equipped vehicles have:

Back 29

a supply pressure gauge.

Front 30

If you must take an emergency stop, you should brake so you:

Back 30

can steer and so your vehicle stays in a straight line.