Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A technician is performing maintenance on a large bulldozer that utilizes an air-over-hydraulic braking system. The air tanks have been drained, but the brake pedal still feels firm when pressed. What should the technician suspect as a source of stored energy?
Even after draining air tanks, hydraulic braking systems can retain significant hydraulic pressure, especially if accumulator circuits are present. A firm brake
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Question: A technician is performing maintenance on a large bulldozer that utilizes an air-over-hydraulic braking system. The air tanks have been drained, but the brake pedal still feels firm when pressed. What should the technician suspect as a source of stored energy?
Answer options: ✅ Residual pressure in the hydraulic circuits.
- A faulty air compressor.
- A seized brake caliper.
- Low engine oil pressure.
Correct answer: Residual pressure in the hydraulic circuits.
Explanation: Even after draining air tanks, hydraulic braking systems can retain significant hydraulic pressure, especially if accumulator circuits are present. A firm brake pedal suggests the presence of this residual hydraulic pressure, which must be safely bled down before work begins. The other options are unlikely to cause a firm brake pedal after air tank drainage.
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