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Which anti-lock component may need a scan tool during bleeding?

  • A.The pressure accumulator, whose charge must be released before any bleeding operation is attempted upon the system
  • B.The hydraulic modulator valve block
  • C.The wheel speed sensor, which must be recalibrated after the fluid has been changed within the braking system
  • D.The master cylinder

Answer: B

Air trapped in the modulator cannot be expelled by pedal pressure alone, so a scan tool cycles the valves and the pump during bleeding. Omitting the step leaves a permanently spongy pedal. Accumulators do need depressurising on some systems, which makes that option plausible. The shared behaviour explains why these belong together and the differences explain why both exist. Naming what changes and what stays the same is the reliable route through questions of this shape.

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