Spring Brake will engage when PSI falls between which range?

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Multiple Choice

Spring Brake will engage when PSI falls between which range?

Explanation:
Spring brakes are held in the released position by air pressure, and when system pressure drops into a low range, the stored spring force takes over and applies the brakes. The designed threshold for engagement is about 20 to 45 psi. Within this range, the air pressure is low enough that the springs can move the brake shoes onto the drums, securing the vehicle as an emergency/parking brake. If the pressure falls below this window, the springs engage; if it stays well above this window, the brakes remain released. Therefore, the correct range is 20–45 psi.

Spring brakes are held in the released position by air pressure, and when system pressure drops into a low range, the stored spring force takes over and applies the brakes. The designed threshold for engagement is about 20 to 45 psi. Within this range, the air pressure is low enough that the springs can move the brake shoes onto the drums, securing the vehicle as an emergency/parking brake. If the pressure falls below this window, the springs engage; if it stays well above this window, the brakes remain released. Therefore, the correct range is 20–45 psi.

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