During normal driving, spring brakes are normally held back by which force?

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Multiple Choice

During normal driving, spring brakes are normally held back by which force?

Explanation:
Air pressure keeps the spring brakes in the released position during normal driving. The springs inside the brake chambers are designed to apply the brakes when air pressure is removed. So when air pressure is present, it counteracts the spring force and holds the brakes off. If air pressure drops, the springs automatically engage the brakes. Fuel pressure, hydraulic pressure, and electrical power don’t perform this function in the spring-brake system.

Air pressure keeps the spring brakes in the released position during normal driving. The springs inside the brake chambers are designed to apply the brakes when air pressure is removed. So when air pressure is present, it counteracts the spring force and holds the brakes off. If air pressure drops, the springs automatically engage the brakes. Fuel pressure, hydraulic pressure, and electrical power don’t perform this function in the spring-brake system.

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