Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty truck equipped with air brakes is experiencing excessive air loss when the service brakes are applied. The compressor cycles frequently, and the low air pressure warning light illuminates intermittently. Which of the following is the most likely cause of this issue?
A ruptured brake chamber diaphragm will directly cause air to escape when the service brakes are applied, leading to significant air loss and frequent compresso
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Question: A heavy-duty truck equipped with air brakes is experiencing excessive air loss when the service brakes are applied. The compressor cycles frequently, and the low air pressure warning light illuminates intermittently. Which of the following is the most likely cause of this issue?
Answer options: ✅ A ruptured brake chamber diaphragm
- A restricted air dryer cartridge
- A malfunctioning foot valve (treadle valve)
- A seized slack adjuster
Correct answer: A ruptured brake chamber diaphragm
Explanation: A ruptured brake chamber diaphragm will directly cause air to escape when the service brakes are applied, leading to significant air loss and frequent compressor cycling. While a restricted air dryer or malfunctioning foot valve could affect system pressure, a direct leak upon brake application points to the brake chamber as the primary suspect. A seized slack adjuster would affect brake adjustment but not directly cause excessive air loss.
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