Displacement detection system and displacement detection method for brake pedal

Disclosed herein is a displacement detection system for a brake pedal. The system includes a displacement detection device including a pedal wake up sensor detecting the change in magnetic flux to generate a wake up signal for activating a control device, and a pedal travel sensor having a plurality of detectors that independently detect the magnetic flux, and detecting a change in magnetic flux to measure a stroke of the brake pedal, and is configured to verify reliability of a measurement value that is measured by each of the plurality of detectors of the pedal travel sensor using a measurement value of the pedal wake up sensor.