Louisiana Class D Chauffeur's License Practice Test

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Prepare for the Louisiana Class D Chauffeur's License Exam. Study with comprehensive quizzes and multiple-choice questions that test your knowledge of driving regulations and safety practices specific to Louisiana. Get ready for your licensing exam with confidence!

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At what pressure should the parking brake valve close during the air brake check?

0-10 psi
10-20 psi
20-40 psi
40-60 psi

The correct answer is: 20-40 psi

The parking brake valve should close during the air brake check at a pressure typically within the range of 20-40 psi. This is significant because it ensures that the braking system maintains adequate pressure to effectively engage and disengage the parking brakes as necessary. If the pressure is too low, the parking brake may not function as intended, potentially leading to safety hazards. The specified range indicates that the system is operating correctly within the manufacturer's standards, indicating proper functionality of the air brake system. This knowledge is critical for drivers to ensure that their vehicle's braking system is reliable and can hold the vehicle stationary when parked. Proper understanding of these pressure ranges promotes safe vehicle operation and compliance with legal requirements.