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CDL NY Air Brakes
Question | Answer |
---|---|
You should know that your brakes are fading when: | You have to push harder on the brake are pedal to control your speed on downgrade |
The brake system that applies the use of the brake when the driver uses the brakes pedal is the___ brake system? | Service |
The air compressor governor controls: | When air is pumped into the air tanks. |
If your truck's air compressor has its own oil supply when should you first check its oil level? | Before driving. |
For air brake system in good condition the air compressor start pumping at about ____ P.S.I | 100psi |
If your vehicle has an alcohol evaporator, it is there to: | Reduce the risk of ice in air brake valves in cold weather |
Some air brake systems have an alcohol evaporator. What happen if you don't keep the unit filled with alcohol? | Ice will form in the storage tanks and cause the brakes to ---- |
The safety valve is set automatically to reduce pressure to _____ PSI | 150 |
The brake pedal in an air brake system: | Controls the air pressure applied to put on the brakes. |
Repeatedly pressing and releasing ( Fanning the brake pedal may result in: | A loss of air pressure |
The most common type of foundation brake found on heavy vehicles is the: | S-cam drum |
S-cam. | Forces the brake shoes against the inside of the brake drum. |
When the brakes are applied the brakes shoes or linings are pressed against the: | Brake drums or disc. |
All air brake equipped vehicles have: | A supply pressure gauge. |
The application pressure gauge shows how much air pressure you: | Are applying to the brakes. |
The driver must be able to see a warning before air pressure in the service air tanks falls below _____PSI | 60 |
Stop light switch: | Turns on the brake lights to warn drivers behind you. |
Under normal conditions in order to engage the parking brakes the driver must first: | Make sure the air brake system is fully pressurized. |
The braking power of the spring brakes; | Depends on the service brakes being in adjustment. |
The parking or emergency brake on trucks and buses can only be held on by _____ | Spring |
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to | Release the spring emergency/parking brakes to move a short distance |
If the springs brakes are on you should push the brake pedal. | Never |
The most important thing to do when the low air warning comes on: | Stop and safely park as soon as possible |
YOur vehicle has a dual air brake system. If a low pressure warning comes on for the secondary system; you should: | Bring the vehicle to a safe stop and continue only when the system is fixed |
If your truck has a dual air system and one of the systems is low pressure. | Either the front or rear brakes will not be fully operational. |
To check the free play of manual slack adjusters on S-cam brakes you should park on: | Level ground, chock the wheels, and turn off the parking brakes. |
The slack adjuster probably needs to be adjusted if it moves more than, about____ inch. When you pull hard on it. | 1 |
How should you check that the spring brakes come on when air pressure in the system drops below a certain level: | Park on a level ground,chock the wheel release parking brake - you have enough air |
If your truck has a properly functioning dual air brake system minimum size air tanks, the pressure should build from 85 to 100 PSI in ____ | 45 |
The air loss rate of straight truck or bus with the engine of air brakes on should not be more than: | 3 PSI in 1 min |
If air pressure does not go back to normal in the correct -- then: | The air pressure may drop too low during driving requiring dependency |
The air compressor should stop pumping at about ______ | 125 |
You are driving a truck or bus with a dual air brake system the pressure in each system should be at least ____ PSI | 100 |
How should you check that your service brakes are working properly? | Park on level ground, waits for normal air pressure, and release the parking brake firmly using the brake pedal. |
To test air service brakes you should: | Brake firmly when slowly moving forwards. |
If you must make an emergency stop, brake so you: | Can steer and your vehicle stay in a straight line |
Emergency controlled braking is used when: | Applying the brakes as hard as you can without locking |
Emergency stab braking is when you: | Brake as hard as you can; release the brakes when the wheel locks up |
Under ideal conditions a truck with air brakes going 55mph requires a stopping distance of: | More than 300ft. |
The total stopping distance for air brakes is longer than the hydraulic brakes due to ___ distance: | Brake lag |
The air brake lag distance at 55mph on dry pavement ads about ____ feet to the stopping distance. | 32 |
Excessive use of service brakes result in over heating which can lead to: | Expansion of the brake drums. |
The use of air brakes on a long or steep downgrade under normal conditions is only a supplement to: | The braking effect of the engine. |
The proper method of breaking while going down long or steep curves after selecting the proper gear is to brake until your speed drops to ___ mph below the safe speed then release your brakes. | 5 |
You are driving down a steep downhill grade and you have checked for a safe speed of 40mph. Apply the service brake until your speed drops to ___ mph. | 35 |
If your truck or bus has dual air brake system and the low air warning comes on for only one system. What should you do? | Stop by the road and park. Continue on after the system is fixed. |
In air brake vehicles, the parking brakes should be used; | Any time the vehicle is parked. |
Which of these is not the proper time to use parking brakes? | If the brakes are very hot, (I.E. after just coming down a hill.) |
Of the choices below the first thing to do when low pressure air warning comes on is: | Stop and safely park as soon as possible. |
Spring brakes used on tractors or straight trucks will bring your truck to a stop when the air pressure drops _____ PSI | 60 |
An air pressure system is fully charged at ______ PSi | 125 |
Air braking takes more time than hydraulic braking because air: | Takes more time to flow threw the lines than hydraulic fluid. |
If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of the storage tank? | At the end of each day of driving. |
The modulating control valve allows you to control the: | Spring brakes |