Spring brakes engage within which pressure range?

Study for the North Carolina School Bus Driver Test. Review flashcards and multiple choice questions, each question includes hints and explanations to help you prepare. Get ready for your exam!

The engagement of spring brakes occurs within the pressure range of 20-45 psi. This range is crucial for ensuring that the spring brakes are activated at the appropriate level of air pressure, providing an effective means of stopping the vehicle in case of pneumatic failure or when the air pressure drops below a safe operating threshold.

Spring brakes rely on stored energy in the form of compressed springs to bring the vehicle to a stop when air pressure in the brake system becomes insufficient. Consequently, the correct pressure range is essential for ensuring that the spring brakes can function effectively. If the pressure falls below 20 psi, the spring brakes will fully engage, while pressures above this range allow normal braking operation. Therefore, understanding this pressure threshold is vital for safe operation and maintenance of the braking system on a school bus.

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