| Air brakes Practice Test 1 |
Taking the CDL written exam can be stressful, feel free to practice on our free practice exam. This practice exam has been put together by a former CDL instructor and hits all the right points. You can even choose to e-mail yourself the results if you so desire.
The practice test will help you prepare for the AIR BRAKES test when testing for your CDL.
Good luck.
|
| Air brakes are a good and safe way of stopping large and heavy vehicles, but the brakes must be well maintained and used properly.
True
False
|
| Air brakes consist of three different braking systems.
True
False
|
| The service brake system applies and releases the brakes when you use the brake pedal during normal driving.
True
False
|
| The parking brake system applies and releases the service brakes when you use the parking brake control.
True
False
|
| The emergency brake system uses parts of the service and parking brake systems to stop the vehicle in a brake system failure.
True
False
|
| The air compressor pumps air into the air storage tanks (reservoirs).
True
False
|
| The air compressor governor controls when the air compressor will pump air into the air storage tanks.
True
False
|
When air tank pressure rises to the cut-out level (around ___
pounds per-square-inch or psi), the governor stops the compressor from pumping air.
100
125
150
None of the above
|
| When the tank pressure falls to the cut-in pressure (around ___ psi), the governor allows the compressor to start pumping again.
100
125
150
None of the above
|
| Each air tank is equipped with a drain valve in the bottom.
True
False
|
| The safety valve protects the tank and the rest of the system from too much pressure. The valve is usually set to open at 150 psi.
True
False
|
| Pushing the brake pedal down harder applies more air pressure.
True
False
|
| Foundation brakes are used at each wheel. The most common type is the s-cam drum brake.
True
False
|
| To stop, the brake shoes and linings are pushed against the inside of the drum. This causes friction, which slows the vehicle (and creates heat).
True
False
|
| Too much heat can make the brakes stop working.
True
False
|
| The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum.
True
False
|
| Wedge Brakes. In this type of brake, the brake chamber push rod pushes a wedge directly between the ends of two brake shoes.
True
False
|
| In air-operated disc brakes, air pressure acts on a brake chamber and slack adjuster, like s-cam brakes.
True
False
|
| All vehicles with air brakes have a pressure gauge connected to the air tank.
True
False
|
| Application Pressure Gauge; This gauge shows how much air pressure you have to apply to the brakes.
True
False
|
| All vehicles with air brakes must have a low air pressure warning signal.
True
False
|
| Front wheel brakes are good under all conditions.
True
False
|
| A warning signal you can see must come on before the air pressure in the tanks falls below __ psi (or one half the compressor governor cutout pressure on older vehicles).
20
40
60
None of the above
|
| When driving, powerful springs are held back by air pressure.
True
False
|
A parking brake control in the cab
allows the driver to let the air out of the spring brakes.
True
False
|
| The braking power of spring brakes depends on the brakes being in adjustment.
True
False
|
| If the brakes are not adjusted properly, neither the regular brakes nor the emergency/parking brakes will work right.
True
False
|
| In newer vehicles with air brakes, you apply the parking brakes using a diamond-shaped, red, push-pull control knob.
True
False
|
| Vehicles with ABS have yellow malfunction lamps to tell you if something isn’t working.
True
False
|
Vehicles with ABS; If the lamp stays on after the bulb check, or goes on once you are underway, you may have lost ABS control
at one or more wheels.
True
False
|
| ABS is an addition to your normal brakes. It does not decrease or increase your normal braking capability.
True
False
|
| ABS does not necessarily shorten your stopping distance, but it does help you keep the vehicle under control during hard braking.
True
False
|
|
|
