Air Brakes Practice Questions
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- Front brake limiting valve
- Safety valve
- Dual parking control valve
- Modulating control valve
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.
- Parking brake
- Modulating control valve
- Dual air brake valve
- Dual parking control valve
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.
- Immediately call your dispatcher
- Stay wherever you are
- Plan your movements very carefully
- Coast as far as possible
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.
- 85 psi
- 60 psi
- 100 psi
- 120 psi
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.
- Supplies the trailer brakes alone
- Controls the spring brakes
- Is just a backup
- Controls the front brakes
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.
- You should pump the brake pedal very quickly
- The other part will pick up the slack
- You should stop immediately and park the vehicle
- You can keep driving normally
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.
- Backup system
- Secondary system
- Trailer brake system
- Other system
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.
- The air filter
- The air compressor drive belt
- Radiator cap
- The oil filter
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.
- Not at all
- About an inch
- 2 inches
- 3 inches
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.
- Logbook violations
- Dirty cab
- Out-of-adjustment brakes
- Tire wear
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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