2026 Free Colorado DMV Class B Air Brakes Test 2 (25 Questions And Complete Answers)
1 / 25
Terms in this set
25
Friction inside a brake drum is caused when the brake shoes and linings:
1. Push against each other.
2. Separate from the axle.
3. Push against the inside of the drum.
4. Create excess heat.
1. Push against each other.
2. Separate from the axle.
3. Push against the inside of the drum.
4. Create excess heat.
Push against the inside of the drum.
Where is the safety relief valve usually located?
1. Near the rear brake
2. Near the front brake
3. In an air tank
4. On the dashboard
1. Near the rear brake
2. Near the front brake
3. In an air tank
4. On the dashboard
In an air tank
In a dual air brake system:
1. Each system has separate air tanks, hoses, and lines.
2. The systems share air tanks, but each has its own separate hoses and lines.
3. Each system uses the same lines and hoses.
4. One system is the main braking system and a second system is ready to be used if the first one fails.
1. Each system has separate air tanks, hoses, and lines.
2. The systems share air tanks, but each has its own separate hoses and lines.
3. Each system uses the same lines and hoses.
4. One system is the main braking system and a second system is ready to be used if the first one fails.
Each system has separate air tanks, hoses, and lines.
What can happen if the air pressure gets too low in an air brake system?
1. The brakes may squeak.
2. The brakes may not work.
3. The brakes may be sluggish.
4. The brakes will be very sensitive.
1. The brakes may squeak.
2. The brakes may not work.
3. The brakes may be sluggish.
4. The brakes will be very sensitive.
The brakes may not work.
Most heavy-duty vehicles use:
1. Single air brake systems.
2. Dual air brake systems.
3. Triple air brake systems.
4. Quadruple air brake systems.
1. Single air brake systems.
2. Dual air brake systems.
3. Triple air brake systems.
4. Quadruple air brake systems.
Dual air brake systems.
How many air storage tanks are used in an air brake system?
1. Two tanks
2. Four tanks
3. Six tanks
4. The number varies.
1. Two tanks
2. Four tanks
3. Six tanks
4. The number varies.
The number varies.
Spring brakes come on:
1. When too much air pressure is lost.
2. When a control on the dashboard is activated.
3. When the tires have minimal tread depth.
4. When the brakes are noisy.
1. When too much air pressure is lost.
2. When a control on the dashboard is activated.
3. When the tires have minimal tread depth.
4. When the brakes are noisy.
When too much air pressure is lost.
A dual air brake system:
1. Has a single air brake system, but uses two sets of controls.
2. Has one air brake system for each side of the truck.
3. Has two brakes for each wheel.
4. Has two separate air brake systems, but uses a single set of controls.
1. Has a single air brake system, but uses two sets of controls.
2. Has one air brake system for each side of the truck.
3. Has two brakes for each wheel.
4. Has two separate air brake systems, but uses a single set of controls.
Has two separate air brake systems, but uses a single set of controls.
When only the tractor is equipped with an Anti-Lock Braking System (ABS):
1. There is a decreased risk of jackknifing.
2. There is an increased risk of jackknifing.
3. The brakes will not work as effectively as they would without ABS.
4. The brakes will become more sensitive.
1. There is a decreased risk of jackknifing.
2. There is an increased risk of jackknifing.
3. The brakes will not work as effectively as they would without ABS.
4. The brakes will become more sensitive.
There is a decreased risk of jackknifing.
During a static leakage test, the maximum leakage rate for a single vehicle with air brakes is ____ in one minute.
1. 1 psi
2. 2 psi
3. 3 psi
4. 4 psi
1. 1 psi
2. 2 psi
3. 3 psi
4. 4 psi
2 psi
Showing the first 10 terms. Use the flashcard player above to study all 25 terms!