Heavy Duty Equipment Technician Red Seal Exam Prep · Question
During a pre-trip inspection of an air-braked commercial vehicle, the operator observes a sudden drop in air pressure in the secondary air tank, accompanied by an audible air leak from the left front wheel area. The brake pedal feels spongy, and the vehicle pulls to the right when stopping. Which component is most likely failing?
A leaking diaphragm in the left front brake chamber would explain the audible air leak from that area and the sudden drop in secondary air pressure. This loss o
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Question: During a pre-trip inspection of an air-braked commercial vehicle, the operator observes a sudden drop in air pressure in the secondary air tank, accompanied by an audible air leak from the left front wheel area. The brake pedal feels spongy, and the vehicle pulls to the right when stopping. Which component is most likely failing?
Answer options:
- A ruptured air line to the right front brake chamber.
- A faulty air dryer desiccant cartridge. ✅ A leaking diaphragm in the left front brake chamber.
- A seized slack adjuster on the left front brake.
Correct answer: A leaking diaphragm in the left front brake chamber.
Explanation: A leaking diaphragm in the left front brake chamber would explain the audible air leak from that area and the sudden drop in secondary air pressure. This loss of braking force on the left side would cause the vehicle to pull to the right during braking, and the overall air loss would contribute to a spongy pedal feel.
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