At what system air pressure should the spring brakes begin to release?

At what system air pressure should the

Multiple choice — select the best answer

ABetween 10-20 psi
BBetween 65-75 psi
CBetween 90-100 psi
DBetween 40-60 psi

✓ Correct answer: D. Between 40-60 psi Federal regulations require that spring brakes begin to release as pressure builds between 40-60 psi. This ensures the vehicle remains immobilized by the spring brakes until sufficient air pressure is available for proper service brake operation.

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At what system air pressure should the spring brakes begin to release?

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