Discussion
Which action does an anti-lock system take when a wheel begins to lock?
Answer: D
The modulator isolates the wheel, dumps pressure to an accumulator, then pumps it back, cycling many times a second. The pulsing felt at the pedal is the pump returning fluid. Each wheel is controlled independently on a four channel system. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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