What happens to air in the brake chamber when the parking brake is engaged?

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Multiple Choice

What happens to air in the brake chamber when the parking brake is engaged?

Explanation:
Parking brakes use a spring brake chamber where a strong spring applies the brakes and air pressure holds the spring back. When you engage the parking brake, air is vented from the brake chamber to the atmosphere, allowing the spring to expand and press the brake shoes against the drum. It’s not about increasing pressure or sending air to the tank—the chamber simply releases its air to atmosphere to activate the brake.

Parking brakes use a spring brake chamber where a strong spring applies the brakes and air pressure holds the spring back. When you engage the parking brake, air is vented from the brake chamber to the atmosphere, allowing the spring to expand and press the brake shoes against the drum. It’s not about increasing pressure or sending air to the tank—the chamber simply releases its air to atmosphere to activate the brake.

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