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Air Brakes Free CDL Practice Tests
Page 4

Prepare For The Air Brakes Portion Of Your CDL Written Exams

Air Brakes Questions

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Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a:
  • Dual parking control valve
  • Modulating control valve
  • Safety valve
  • Front brake limiting valve
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From The CDL Manual

Modulating control valves:

In some vehicles a control handle on the dash board may be used to apply the spring brakes gradually. This is called a “modulating valve.” It is spring-loaded so you have a feel for the braking action. The more you move the control lever, the harder the spring brakes come on. They work this way so you can control the spring brakes if the service brakes fail. When parking a vehicle with a modulating control valve, move the lever as far as it will go and hold it in place with the locking device.

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Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
  • Dual parking control valve
  • Dual air brake valve
  • Modulating control valve
  • Parking brake
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From The CDL Manual

Dual parking control valves:

When main air pressure is lost, the spring brakes come on. Some vehicles, such as buses, have a separate air tank that can be used to release the spring brakes so you can move the vehicle in an emergency. One of the valves is a push-pull type and is used to put on the spring brakes for parking. The other valve is spring-loaded in the “out” position. When you push the control in, air from the separate air tank releases the spring brakes so you can move. When you release the button, the spring brakes come on again. There is only enough air in the separate tank to do this a few times. Therefore, plan carefully when moving. Otherwise, you may be stopped in a dangerous location when the separate air supply runs out.

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In case of emergency when driving a vehicle equipped with dual parking control valves, you should:
  • Immediately call your dispatcher
  • Stay wherever you are
  • Plan your movements very carefully
  • Coast as far as possible
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From The CDL Manual

Dual parking control valves:

When you release the button, the spring brakes come on again. There is only enough air in the separate tank to do this a few times. Therefore, plan carefully when moving. Otherwise, you may be stopped in a dangerous location when the separate air supply runs out.

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What must the air pressure be, at minimum, in both parts of a dual air brake system?
  • 60 psi
  • 100 psi
  • 120 psi
  • 85 psi
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From The CDL Manual

Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.

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In a dual air brake system, one system will typically control the rear brakes, and the other:
  • Is just a backup
  • Controls the front brakes
  • Controls the spring brakes
  • Supplies the trailer brakes alone
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From The CDL Manual

Dual Air Brake Systems:

Most newer heavy-duty vehicles use dual air brake systems for safety. A dual air brake system has two separate air brake systems that use a single set of brake controls. Each system has its own air tanks, hoses, lines, etc. One system typically operates the regular brakes on the rear axle or axles. The other system operates the regular brakes on the front axle and possibly one rear axle. Both systems supply air to the trailer if there is one. The first system is called the “primary” system. The other is called the “secondary” system.

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In a dual air brake system, if the air pressure in one part of the system drops enough to set off the low air warning:
  • The other part will pick up the slack
  • You can keep driving normally
  • You should pump the brake pedal very quickly
  • You should stop immediately and park the vehicle
Click here to look up the answer

From The CDL Manual

Dual Air Brake Systems:

The warning light and buzzer should come on before the air pressure drops below 60 psi in either system. If this happens while driving, you should stop right away and safely park the vehicle. If one air system is very low on pressure, either the front or the rear brakes will not be operating fully. This means it will take you longer to stop. Bring the vehicle to a safe stop and have the air brake system fixed.

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In a dual air brake system, the first system, supplying the rear brakes, is commonly known as the "primary" system, and the other as the:
  • Secondary system
  • Backup system
  • Trailer brake system
  • Other system
Click here to look up the answer

From The CDL Manual

Most newer heavy-duty vehicles use dual air brake systems for safety. A dual air brake system has two separate air brake systems that use a single set of brake controls. Each system has its own air tanks, hoses, lines, etc. One system typically operates the regular brakes on the rear axle or axles. The other system operates the regular brakes on the front axle and possibly one rear axle. Both systems supply air to the trailer if there is one. The first system is called the “primary” system. The other is called the “secondary” system.

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When inspecting the air brake system, what particular item in the engine compartment should the driver pay specific attention to?
  • The air filter
  • The oil filter
  • The air compressor drive belt
  • Radiator cap
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From The CDL Manual

Check air compressor drive belt if compressor is belt driven.

If the air compressor is belt driven, check the condition and tightness of the belt. The belt should be in good condition.

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How far should manual slack adjusters move before they need to be adjusted?
  • 2 inches
  • 3 inches
  • About an inch
  • Not at all
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From The CDL Manual

Check manual slack adjusters on S-Cam brakes:

Park on level ground and chock the wheels to prevent the vehicle from moving. Turn off the parking brakes so you can move the slack adjusters. Use gloves and pull hard on each slack adjuster that you can get to. If a slack adjuster moves more than about one inch where the push rod attaches to it, it probably needs adjusting. Vehicles with too much brake slack can be very hard to stop. Out-of-adjustment brakes are the most common problem found in roadside inspections. Be safe. Check the slack adjusters.

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The most common problem found in roadside inspections is:
  • Out-of-adjustment brakes
  • Dirty cab
  • Logbook violations
  • Tire wear
Click here to look up the answer

From The CDL Manual

Check manual slack adjusters on S-Cam brakes:

Park on level ground and chock the wheels to prevent the vehicle from moving. Turn off the parking brakes so you can move the slack adjusters. Use gloves and pull hard on each slack adjuster that you can get to. If a slack adjuster moves more than about one inch where the push rod attaches to it, it probably needs adjusting. Vehicles with too much brake slack can be very hard to stop. Out-of-adjustment brakes are the most common problem found in roadside inspections. Be safe. Check the slack adjusters.

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