Take Alabama CDL General Practice Test

QUESTION 1 / 10

What is the most common type of foundation brakes found on heavy vehicles?

Choose one answer below.

AS-Cam brakes✓BAir disc brakes✓CHydraulic drum brakes✓DHydraulic caliper brakes✓

QUESTION 2 / 10

During brake system failure, what does the emergency brake system utilize?

Choose one answer below.

AOnly the service brake✓BOnly the parking brake✓CParts of the service brake and parking brake✓DThe ABS system✓

QUESTION 3 / 10

Which device measures the pressure in the air tanks?

Choose one answer below.

AThe brake pedal✓BThe tractor protection valve✓CThe supply pressure gauge✓DThe wheel cylinder✓

QUESTION 4 / 10

In an air-brake system, what factor ensures the spring brakes remain retracted during normal operation?

Choose one answer below.

AHydraulic pressure✓BAir pressure✓COil temperature✓DTire pressure✓

QUESTION 5 / 10

If you vehicle has a dual air brake system and a low air pressure warning comes on for only one system, what should you do?

Choose one answer below.

AContinue driving to the nearest safe stop✓BStop. Safely park and only continue after the vehicle has been fixed✓CCheck the air gauge and drive slowly✓DIgnore the warning if the other system is fine✓

QUESTION 6 / 10

Which component is primarily responsible for adjusting the free play in the braking system?

Choose one answer below.

ASlack adjuster✓BBrake drum✓CMaster cylinder✓DBrake shoes✓

QUESTION 7 / 10

To test the static air leakage rate, you should

Choose one answer below.

ATurn off the engine, release the parking brake, and let the engine settle✓BIncrease engine speed and watch the gauge✓CDrain the air tanks completely✓DKeep the engine running and park safely✓

QUESTION 8 / 10

The parking brake control

Choose one answer below.

ALets the air out of the brake chamber✓BApplies extra pressure to brakes✓CLocks the wheels✓DIncreases air pressure✓

QUESTION 9 / 10

Repeatedly pressing and releasing (fanning) the brake pedal may result in?

Choose one answer below.

AA loss of air pressure✓BIncreased braking efficiency✓CReduced brake wear✓DImproved control✓

QUESTION 10 / 10

What is the function of the modulating control valve in braking systems?

Choose one answer below.

AA sensor that prevents ABS wheel lock✓BA shutoff valve that prevents runaway brake pressure✓CA spring loaded valve that will let you put on the brakes on slowly if the service brakes fail✓DA device that increases brake pressure during emergency✓