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19 Cards in this Set
- Front
- Back
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Under normal conditions, in order to engage the parking brakes the driver should: |
Apply brakes by pulling the parking brake control knob out |
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Your truck has a dual air system and one of the systems loses its pressure. What will happen? |
Either the front or back brake will not be fully operational |
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If the air compressor should develop a leak, what keeps the air in the tanks? |
The one-way valve check |
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The driver must be able to see a low air pressure warning which comes on before pressure in the service air tank fall below ____ psi |
60 |
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Some air brake systems have an alcohol evaporator. What may happen if you don't keep the proper lever of alchohol? |
Ice may form in the air break valves and cause break failure. |
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Your truck or bus has a dual air brake system. If a low pressure warning comes on for only one system, what should you do? |
Bring your vehicle to a complete stop right away and safely park. Continue only after the system is fixed. |
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The most important thing to do when a low air pressure warning comes on is: |
Stop in safely park as soon as possible. |
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Your bricks are fading when: |
You have to push harder on a brake pedal to control your speed on a downgrade |
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If your truck has a properly functioning dual air break system and minimum size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds |
45 |
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The use of Brakes on a long and steep downgrade under normal conditions is only a supplement to: |
The breaking effect of the engine |
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If your truck has a dual air break system and one of the systems is low on pressure: |
Either the front or rear brakes will not be fully functional. |
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The proper use of the Breaks when going down a long steep grade after selecting a proper gear is to brake until your speed is about ____ below the posted speed and release your brake. |
5 mph |
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What is a "Wig Wag" |
A mechanical arm that signals low air pressure |
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The break system that applies and releases the brakes when the driver uses the break pedal is the ______ brake system |
Service |
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If your vehicle has an alcohol evaporator, it is there to: |
Reduce the risk of icing in air break valves in cold weather. |
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If you are driving down a steep downgrade and have reached your safe speed of 40 mph, you would apply the service break until your speed dropped to ____ mph |
35 |
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It is not safe to drive a vehicle that has brake drums with cracks that are longer than ____ of the widith of the friction area. |
1/2 |
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During normal driving, spring breaks are usually held back by: |
Air pressure |
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Modern Airbreaks combine three different systems. they are the service, the parking, and the_____ brakes. |
Emergency |
