Connecticut CDL — Air Brakes practice
Connecticut CDL — Air Brakes: Parking & Stopping practice test
Legal and illegal parking, colored curbs, distances from hydrants and crossings, and how to park safely on hills.
Content reviewed against official driver handbooks · August 12, 2026
13 questions · pass with 10 correct. You get instant feedback and an explanation after every answer.
Study questions with answers
12 sample Parking & Stopping questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
Show all 12 questions with answers
1. How do you test that the parking brake will actually hold?
Correct answer: Set the parking brake, then ease the vehicle forward against it while in low gear
Stop the vehicle, apply the parking brake, and ease forward against it in low gear to confirm it holds.
Source: Connecticut CDL Manual, Section 5.3.3 (Final Air Brake Check)
2. With a manual transmission, when should you push in the clutch during a normal stop?
Correct answer: Not until the engine rpm has dropped close to idle
For a smooth, safe stop with a manual box, hold off on the clutch until engine rpm falls near idle, then pick a starting gear once stopped.
Source: Connecticut CDL Manual, Section 5.4.1 (Normal Stops)
3. Why should you avoid pressing the brake pedal while the spring brakes are already set?
Correct answer: The combined spring and air forces could damage the brakes
Pushing the pedal can load the brakes with the combined force of the springs plus the stored air pressure, which may damage them.
Source: Connecticut CDL Manual, Section 5.1.15 (Parking Brake Controls)
4. On a tractor or straight truck, spring brakes come fully on when air pressure drops into what range?
Correct answer: 20 to 45 psi
As air pressure bleeds down to roughly 20 to 45 psi (often 20 to 30), the spring brakes apply on their own, but you should stop well before that when the warning first sounds.
Source: Connecticut CDL Manual, Section 5.1.14 (Spring Brakes)
5. How do you park a vehicle whose spring brakes are set by a modulating control lever?
Correct answer: Push the lever through its whole travel and hold it there with the locking device
Since a modulating handle applies more spring brake force the farther it travels, parking calls for the full stroke plus the lock that keeps the lever there.
Source: Connecticut CDL Manual, Section 5.1.15 (Parking Brake Controls)
6. What should you always do before leaving your vehicle unattended?
Correct answer: Apply the parking brakes
Leaving a vehicle without the parking brakes set risks it rolling away and causing injury or damage, so always apply them.
Source: Connecticut CDL Manual, Section 5.4.8 (Parking Brakes)
7. Your brakes are soaked and the temperature is below freezing. How should you dry them out?
Correct answer: Drive in a low gear while pressing the brakes lightly
Light braking at low speed warms the linings and burns the moisture off; parking on soaked brakes in freezing weather can freeze them and leave the vehicle stuck.
Source: Connecticut CDL Manual, Section 5.4.8 (Parking Brakes)
8. On newer air brake vehicles, how do you apply the parking (spring) brakes?
Correct answer: Pull out the diamond-shaped yellow knob
Newer rigs use a yellow, diamond-shaped push-pull control: pull it out to set the spring brakes and push it back in to let them off.
Source: Connecticut CDL Manual, Section 5.1.15 (Parking Brake Controls)
9. During the final air brake check, how are the service brakes tested?
Correct answer: Creep forward at about five mph, brake firmly, and watch for pulling or a delayed stop
With normal pressure restored and the parking brake off, roll ahead at around five mph and press the pedal hard; a tug to one side, an odd pedal feel, or a sluggish stop each point to trouble worth fixing before you leave.
Source: Connecticut CDL Manual, Section 5.3.3 (Final Air Brake Check)
10. What might the parking brake control look like on an older air brake vehicle?
Correct answer: A round blue knob, or a lever the driver swings to set it
Older trucks never standardized the control: instead of today's yellow diamond knob it may be blue and round, or a handle you swing sideways or vertically.
Source: Connecticut CDL Manual, Section 5.4.8 (Parking Brakes)
11. How are spring brakes held in the released position while you drive?
Correct answer: By air pressure holding back powerful springs
During driving, air pressure keeps strong springs compressed; if that air is lost, the springs push the brakes on.
Source: Connecticut CDL Manual, Section 5.1.14 (Spring Brakes)
12. What does the holding power of the spring brakes depend on?
Correct answer: Whether the brakes are kept properly adjusted
Brakes left out of adjustment weaken the service brakes and the emergency or parking brakes alike, so a neglected truck may not stay put on a grade.
Source: Connecticut CDL Manual, Section 5.1.14 (Spring Brakes)
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