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BDifficulty 2/5

In a hydraulic brake system, which of these factors can cause a spongy pedal?

Correct answer

Air in the hydraulic circuit.

Air in the circuit: its compression can affect pressure transmission. Leaks, bleeding faults or degraded fluid may also be involved; the symptom does not establish a unique diagnosis. If pedal feel changes or braking becomes less effective, stop safely and obtain professional inspection before continuing.

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All options

  • A correctly bled circuit with no faults.

  • Air in the hydraulic circuit.

  • Fluid and a circuit in good condition and within specification.

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