Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty articulated dump truck has a hydraulic brake system. During a service, the technician notices significant scoring on the brake drum and excessive wear on the brake shoe lining on one wheel. Which of the following is the most likely contributing factor to this specific wear pattern?
A seized hydraulic wheel cylinder would prevent the brake shoes from retracting properly, causing constant contact with the drum and leading to accelerated wear
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Question: A heavy-duty articulated dump truck has a hydraulic brake system. During a service, the technician notices significant scoring on the brake drum and excessive wear on the brake shoe lining on one wheel. Which of the following is the most likely contributing factor to this specific wear pattern?
Answer options:
- A misadjusted automatic slack adjuster ✅ A seized hydraulic wheel cylinder
- A faulty brake proportioning valve
- An air leak in the parking brake system
Correct answer: A seized hydraulic wheel cylinder
Explanation: A seized hydraulic wheel cylinder would prevent the brake shoes from retracting properly, causing constant contact with the drum and leading to accelerated wear on both the drum and the brake shoe lining. A misadjusted slack adjuster is for air brakes. A faulty proportioning valve affects braking balance, and an air leak in the parking brake is unrelated to hydraulic service brake wear.
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