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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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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