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Class D License & Air Brake System Part 2
This deck covers essential questions and answers related to Class D License requirements and the air brake system, including safety equipment, braking systems, and emergency procedures.
Freight carrying vehicles and passenger buses must carry either 3 ____, 3____, or 3 ____ and 2____ as warning equipment.
Flares, electric red lanterns or red portable reflectors, and 2 12 inch square red cloth flags
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Key Terms
Term
Definition
Freight carrying vehicles and passenger buses must carry either 3 ____, 3____, or 3 ____ and 2____ as warning equipment.
Flares, electric red lanterns or red portable reflectors, and 2 12 inch square red cloth flags
Flares or fuses are not allowed on these trucks.
Those carrying explosives, flammable liquids, compressed gases, or those using compressed gas for fuel
Warning signals must be placed ___ behind and ___ in front of the vehicle and one ____ to the front or rear on the side of the vehicle facing traffic when it breaks down.
100 ft, 100ft, 10ft
The draw bar used to tow another vehicle must not be more than ___ except when transporting objects which cannot be easily dismembered like poles, pipes, or machinery.
15 ft
The rear view mirror must reflect an image reaching at least ____ behind the vehicle.
200ft
Vehicles weighing or carrying more than ___ must be equipped with extra brakes.
3,000 pounds
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| Term | Definition |
|---|---|
Freight carrying vehicles and passenger buses must carry either 3 ____, 3____, or 3 ____ and 2____ as warning equipment. | Flares, electric red lanterns or red portable reflectors, and 2 12 inch square red cloth flags |
Flares or fuses are not allowed on these trucks. | Those carrying explosives, flammable liquids, compressed gases, or those using compressed gas for fuel |
Warning signals must be placed ___ behind and ___ in front of the vehicle and one ____ to the front or rear on the side of the vehicle facing traffic when it breaks down. | 100 ft, 100ft, 10ft |
The draw bar used to tow another vehicle must not be more than ___ except when transporting objects which cannot be easily dismembered like poles, pipes, or machinery. | 15 ft |
The rear view mirror must reflect an image reaching at least ____ behind the vehicle. | 200ft |
Vehicles weighing or carrying more than ___ must be equipped with extra brakes. | 3,000 pounds |
___ brakes are a safe way of stopping large vehicles when used correctly. | Air |
The three braking systems that make up an air brake system are: | Service brake, parking brake, and emergency brake |
The part of the air brake system which pumps air into the air storage tanks. | Air compressor |
The part of the air brake system which controls when the air compressor will pump air into the air storage tanks. | Air compressor governor |
The part of the air brake system which is operated by turning a quarter turn or by pulling a cable and which must be drained manually at the end of the day. | Manual air tank drain |
The part of the air brake system in which water and oil are automatically expelled. | Automatic air tank drain |
The ___ of the air brake system protects the tanks and the rest of the system from too much pressure. It is usually set at 150 psi. If it releases air, something is wrong. | Safety valve |
The ___ part of the air brake system tells you how much pressure is left in the air tanks. | Supply pressure gauges |
The ____ shows you how much air pressure you are applying to the brakes. | Application pressure gauge |
If the air pressure in the tanks falls below ___, the low air pressure warning will come on. | 60psi |
___ brakes are held back by air pressure and are the mechanical force which keeps the emergency and parking brakes in place. | Spring brakes |
In newer vehicles, you engage the parking brakes by using this knob. | Diamond-shaped, yellow, push-pull knob |
Never push the brake pedal down when the ___ brakes are on. | Spring brakes |
The first step to checking the air brakes is to see if the air pressure drops more than ____ pounds in ___ minute. | 3 pounds in 1 minute |
The second step to checking the air brakes is to ____. | Make sure the low air pressure warning signals are working |
The third step of checking the air brakes is to make sure the parking brake valve closes at ____psi. | 20-40 psi |
7 additional things that must be checked when doing an air brake check. | 1) Air compressor drive belt 2) Manual slack adjusters on S-cam brakes 3) Brake drums, linings, and hoses 4) Rate of air pressure buildup 5) Air compressor governor cut-in and cut-out pressures 6) Parking brake 7) Service brakes |
2 methods of emergency braking. | Controlled or stab |
The type of emergency braking in which you put on the brakes as hard as you can without locking the wheels or turning the steering wheel. | Controlled braking |
The type of emergency braking in which you press the brake pedal as hard as you can, let up when the wheels lock, and push on the brakes again when the vehicle starts rolling. | Stab braking |
With air brakes it takes ____ for the air to flow through the lines to the brakes. | 1/2 second or more |
The equation which equals the total stopping distance for vehicles with air brakes. | Perception distance + reaction distance + brake lag distance + effective braking distance |
If the low air pressure warning for the air brake system comes on you should __. | Stop and safely park as soon as possible |
Brakes can fail or fade from ___ caused by ___. | Excessive heat caused by using them too much or improper adjustment |
Any time you park you should use the parking brake except for these 2 exceptions. | The brakes are very hot or in the brakes are wet and the temperature is freezing |