Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty off-highway grader is experiencing a 'spongy' brake pedal and reduced braking effectiveness. The hydraulic brake fluid reservoir is full. What is the most likely cause?
A 'spongy' brake pedal is a classic symptom of air trapped within the hydraulic brake system. Air is compressible, unlike hydraulic fluid, leading to a soft ped
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Question: A heavy-duty off-highway grader is experiencing a 'spongy' brake pedal and reduced braking effectiveness. The hydraulic brake fluid reservoir is full. What is the most likely cause?
Answer options: ✅ Air trapped in the hydraulic brake lines.
- An over-adjusted parking brake.
- Worn brake pads on one axle.
- A faulty air compressor.
Correct answer: Air trapped in the hydraulic brake lines.
Explanation: A 'spongy' brake pedal is a classic symptom of air trapped within the hydraulic brake system. Air is compressible, unlike hydraulic fluid, leading to a soft pedal feel and reduced braking power. Worn brake pads or an over-adjusted parking brake would cause different issues, and a faulty air compressor is irrelevant for a pure hydraulic system.
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