New York CDL — Air Brakes Practice Test 7

1.If you are on a downgrade and notice you need increasing application gauge pressure to hold the same speed, what should you conclude?

The governor cut-out setting is too lowThe gauge itself is failing and can be ignoredThe brakes are fading and you should slow down and shift to a lower gearThe compressor is overcharging the tanks

2.What does 'controlled braking' mean when you must stop quickly in a vehicle without ABS?

Braking as hard as possible without locking the wheels, while keeping steering input smallLight, steady pedal pressure held for the entire stopLocking the wheels intentionally to shorten the stopUsing only the parking brake control to slow down

3.During the final air brake check, how do you confirm that the parking brake is able to hold the vehicle?

Roll forward at about 5 mph and pull the parking brake knobStop, set the parking brake, then try easing forward in a low gear to confirm it holdsPress the brake pedal fully and watch the gauge for a pressure dropShut off the engine and fan the brakes until the knob pops out

4.For a normal stop in an air-braked vehicle with a manual transmission, how should you use the brake pedal?

Fan the pedal rapidly to keep the linings coolApply full pressure immediately, then release completelyBrake so the vehicle stops smoothly, keeping the clutch out until engine rpm nears idlePush the clutch in first, then coast to the stop with light braking

5.Newer vehicles with air brakes have a yellow, diamond-shaped push-pull knob for the parking brakes. How do you set the parking brakes with it?

Push the knob inPull the knob outTwist the knob a quarter turnPush the knob in while holding the brake pedal down

6.Your vehicle has automatic slack adjusters, and you find one of its brakes out of adjustment. What does the manual recommend?

Readjust it by hand at every pre-trip, since routine adjustment makes the adjuster last longerHave a repair shop correct the problem promptly, because it points to a mechanical faultLeave it alone, because the adjuster resets itself the next time the parking brake is setLoosen the adjusters at the other wheels so every brake matches

7.One of the two systems in your dual air brake setup has become very low on pressure. How does that affect your braking?

Braking is unchanged, because the other system takes over completelyThe brakes at one end of the vehicle, front or rear, lose effectiveness and stopping distance growsEvery brake releases until pressure is restoredOnly the trailer brakes are affected

8.While you are driving normally, what actually keeps the powerful springs in the spring brake chambers from clamping the brakes on?

Hydraulic fluid pressureAn electric solenoid energized by the ignitionAir pressure acting against the springsThe slack adjuster locking pin

9.Using stab braking in an emergency (vehicle without ABS), when should you release the brake pedal after the wheels lock up?

Never — hold the pedal down until fully stoppedAfter counting five full secondsAs soon as the wheels lock, reapplying fully when they start rolling againOnly when the low air pressure warning activates

10.During a walk-around inspection you pull hard on a slack adjuster (parking brake released, wheels chocked). It moves well over an inch where the push rod attaches. What does this mean?

The brake needs adjustment before the vehicle is drivenThis is normal free play for an s-cam brakeThe spring brake is applying correctlyOnly the low air warning device needs to be checked