Ontario Air Brake Practice · Question
Spring parking brakes are held in the 'released' position by what force?
Spring parking brakes are designed to apply automatically when air pressure is lost. When the system has sufficient air pressure, compressed air acts against a
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Question: Spring parking brakes are held in the 'released' position by what force?
Answer options:
- Mechanical linkage tension from the foot pedal.
- Hydraulic pressure acting on a diaphragm. ✅ Compressed air pressure opposing the spring force.
- Internal vacuum within the brake chamber.
Correct answer: Compressed air pressure opposing the spring force.
Explanation: Spring parking brakes are designed to apply automatically when air pressure is lost. When the system has sufficient air pressure, compressed air acts against a diaphragm in the brake chamber, compressing the powerful spring and holding the brakes in the released position.
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