Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty truck experiences brake drag and overheating on one of its drive axles. The technician notes that the brake pedal is slow to return and the brake light switch remains activated even after the foot is removed from the pedal. Which of the following is the most likely cause of this issue?
A misadjusted pushrod on the master cylinder can prevent the primary cup from fully retracting past the compensating port, trapping fluid pressure in the brake
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Question: A heavy-duty truck experiences brake drag and overheating on one of its drive axles. The technician notes that the brake pedal is slow to return and the brake light switch remains activated even after the foot is removed from the pedal. Which of the following is the most likely cause of this issue?
Answer options:
- A faulty hydraulic brake booster.
- A seized brake caliper piston. ✅ A misadjusted pushrod on the master cylinder.
- Contaminated brake fluid in the system.
Correct answer: A misadjusted pushrod on the master cylinder.
Explanation: A misadjusted pushrod on the master cylinder can prevent the primary cup from fully retracting past the compensating port, trapping fluid pressure in the brake lines and causing brake drag. While a seized caliper piston could cause drag, the slow pedal return and activated brake light switch point more directly to a master cylinder issue.
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