Wyoming CDL — Air Brakes: Parking & Stopping Practice Test

Question 1

Section 5 describes more than one kind of parking brake control. Which pairing of a control and its purpose matches the manual?

Accepted Answer

Modulating control valve: applying the spring brakes gradually if the service brakes fail — A modulating valve lets the driver bring the spring brakes on a little at a time, which gives control if the service brakes fail. The spring-loaded valve on a dual parking control is the one that uses a separate air tank to release the spring brakes so the vehicle can be moved in an emergency.

Answer

Modulating control valve: releasing the spring brakes with air from a separate tank

Answer

Spring-loaded valve on a dual parking control: applying the spring brakes gradually

Answer

Yellow push-pull knob: limiting air to the front brakes on slippery roads

Question 2

Section 5 describes the parking brake control on newer vehicles as a yellow knob shaped like a diamond. What wording does it say the knob carries?

Accepted Answer

Parking brakes — Section 5 says the newer control carries the label "parking brakes." Pulling it out applies the parking brakes, and pushing it in releases them.

Answer

Trailer air supply

Answer

Emergency release

Answer

Tractor protection

Question 3

Section 11M warns that an "unsafe act" during the vehicle inspection test may bring an automatic failure. Which example does it give?

Accepted Answer

Forgetting to set the parking brake — Section 11M's example of an unsafe act is forgetting to set the parking brake, and it says the examiner may end the test over one. Using the section's checklist and asking for clarification are both allowed.

Answer

Pointing to a part before naming it

Answer

Checking items off the provided checklist

Answer

Asking the examiner to clarify an instruction

Question 4

For the parking brake check in Section 11M, you engage the parking brake and gently pull forward against it. What does the manual have you do with the service brake first?

Accepted Answer

Take your foot off it — With the parking brake engaged, you remove your foot from the service brake and then pull forward gently. That way the parking brake alone is what keeps the vehicle from moving.

Answer

Hold it down firmly

Answer

Pump it three times

Answer

Press it lightly to steady the vehicle

Question 5

A driver reasons that spring brakes are applied by springs, not air, so they will hold just as well on brakes that are out of adjustment. What does the manual say?

Accepted Answer

The driver is wrong: spring brake power depends on the brakes being adjusted properly — The manual ties how well spring brakes hold to brake adjustment. With the brakes out of adjustment, the regular brakes and the emergency and parking brakes all fall short.

Answer

The driver is right: springs make up for any slack in the brakes

Answer

The driver is right, but only on vehicles built since 1994

Answer

The driver is wrong: spring brakes stop working whenever the engine is off

Question 6

At the bottom of a long, steep hill you pull into a lot to park, and your brakes are still very hot. Which order of steps fits the manual?

Accepted Answer

Hold the vehicle with wheel chocks on level ground, let the brakes cool, then use the parking brakes — Parking brakes applied while very hot can be damaged by the heat. The manual's answer is to chock the wheels where the ground is level and to wait for the brakes to cool before the parking brakes go on.

Answer

Set the parking brakes right away, then chock the wheels

Answer

Set the parking brakes, then release them once the drums cool

Answer

Leave the vehicle in gear without chocks until the brakes cool

Question 7

Which of these does NOT cause the springs in spring brakes to put the brakes on?

Accepted Answer

Tank pressure rising to the governor's cut-out level — Spring brakes apply when the air holding the springs back is removed, whether the driver lets it out with the parking brake control or a leak drains it away. Pressure reaching cut-out only stops the compressor from pumping; the springs stay held back.

Answer

Pulling the parking brake control knob out

Answer

A leak that lets all the air out of the system

Answer

Air pressure falling into the 20 to 45 psi range

Question 8

Section 11M's trailer brake check has you pull forward gently with the trailer parking brake engaged and the tractor's parking brake released. Besides testing the brake, what does the manual say this assists with?

Accepted Answer

Checking the trailer's coupling connection — The trailer brake check shows whether the trailer's parking brake can keep the rig from moving, and Section 11M notes that it also helps verify the coupling to the trailer. It applies to combination vehicles only.

Answer

Checking the governor's cut-in pressure

Answer

Checking slack adjuster stroke on the steering axle

Answer

Checking the air compressor belt

Wyoming CDL — Air Brakes: Parking & Stopping practice test

Study questions with answers

1. Section 5 describes more than one kind of parking brake control. Which pairing of a control and its purpose matches the manual?

2. Section 5 describes the parking brake control on newer vehicles as a yellow knob shaped like a diamond. What wording does it say the knob carries?

3. Section 11M warns that an "unsafe act" during the vehicle inspection test may bring an automatic failure. Which example does it give?

4. For the parking brake check in Section 11M, you engage the parking brake and gently pull forward against it. What does the manual have you do with the service brake first?

5. A driver reasons that spring brakes are applied by springs, not air, so they will hold just as well on brakes that are out of adjustment. What does the manual say?

6. At the bottom of a long, steep hill you pull into a lot to park, and your brakes are still very hot. Which order of steps fits the manual?

7. Which of these does NOT cause the springs in spring brakes to put the brakes on?

8. Section 11M's trailer brake check has you pull forward gently with the trailer parking brake engaged and the tractor's parking brake released. Besides testing the brake, what does the manual say this assists with?

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