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Modern air brake systems combine 3 different systems. These are the service brakes, the parking brakes and the:
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What are the 3 different systems in Air Brake Systems?
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Air Brakes
CDL
| Question | Answer |
|---|---|
| Modern air brake systems combine 3 different systems. These are the service brakes, the parking brakes and the: | Emergency Breaks |
| What are the 3 different systems in Air Brake Systems? | Service Brakes, Parking Brakes, Emergency Brakes |
| Oil and water usually collect in compressed air tanks. If you do not have an automatic tank drain, when should you drain air tanks? | After every working day |
| Why drain water from compressed air tanks? | Water can freeze in cold weather and cause brake failure |
| Air brake equipped vehicles must have: | a supply pressure gauge |
| What can legally hold a parking or emergency or emergency brake in position for a truck, truck tractor or bus? | spring pressure |
| You should know that your brakes are fading when: | you have to push harder on the brake pedal to control your speed on a downgrade |
| The braking power of the spring brakes: | depends on the adjustment of the service brakes |
| The air compressor governor controls: | when air is pumped into the air tanks |
| The application pressure gauge shows the driver how much pressure: | is being applied to the brakes |
| If your vehicle has an alcohol evaporator, every day during cold weather you should: | check and fill the alcohol level |
| During normal driving, spring brakes are usually held back by: | air pressure |
| Air braking takes more time that hydraulic braking because air brakes: | need to have air flow through the lines to work |
| In air brake vehicles, the parking brakes should be used: | whenever the vehicle is parked |
| When should you test the parking brake? When the vehicle is: | parked |
| Why should you not fan the brakes on and off during long downgrades? | the short time off the brakes DOES NOT ALLOW BRAKE COOLING |
| Which of the following is okay to find in the air brake system? | AIR |
| When using the parking brakes or emergency brakes, what type of pressure is being used? | SPRING PRESSURE |
| What will determine how effective the spring emergency brakes or the parking brakes work? | depends on the adjustment of the service brakes |
| Which brake system applies and releases the brakes when the driver uses the brake pedal? | the SERVICE brake system |
| In air brake equipped vehicles, you use the parking brakes when? | whenever you park the vehicle |
| If your vehicle has an alcohol evaporator, it is there to: | reduce the risk of ice in air brake valves in cold weather |
| The purpose of engine retarders is to: | help slow the vehicle while driving and reduce brake wear |
| A combination vehicle air brake system cannot leak more than ___ psi per minute with the engine off and the brakes released. | 3 |
| Air loss in a single vehicle (not a combination unit) should not be more that _____ with the engine off and the brakes on. | 3 psi in one minute |
| What is a dual air brake system? | a two brake system, one operates the front brakes and one operates the back brakes |
| What are slack adjusters? | It is an adjusting nut on the backside of the brake drum used for adjusting the brakes |
| How can you test the low pressure warning signal? | Shut off the engine with enough air pressure, turn on the electrical power and step on and off the brake pedal until the low air pressure warning signal comes on |
| What is the purpose of an alcohol evaporator? | to reduce the risk of ice in the brake valves and other parts in cold weather |
| What is another name for controlled braking? | squeeze braking |
| Air braking takes more time than hydraulic braking because air: | takes more time to flow through the lines than hydraulic fluid |
| The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than: | 2 psi in one minute |
| To test air service brakes, you should brake firmly when moving slowly forward. The brakes are okay if you notice: | none of the above. |
| On long downhill grades, experts recommend using a low gear and light, steady pedal pressure instead of on-again and off-again braking. Why? | Air usage is less with light steady pressure Brake linings do not heat up as much with light pressure You can keep vehicle speed constant in a low gear with light, steady pressure (All of the above) |
| When you have to make a quick emergency stop, you should brake in a way that allows you to: | Continue in a straight line and maintain steering control |
Created by:
zedoc43