Fault Phenomenon: SANY SKT105 wide body mining truck light braking has no effect, heavy braking suddenly locks up, instrument reports brake sensor fault.

Troubleshooting Process:
– Checked sensor: pedal travel sensor signal jumping or open circuit.
– Checked wiring: harness worn or connector oxidized.
– Checked mechanical: pedal return spring fatigued.
– Checked controller: brake control unit receiving incorrect signal.

Root Cause: The internal resistor film of the brake pedal displacement sensor is worn, causing non-linear output signals, preventing the brake control unit from accurately calculating braking force.

Required Parts: Replace brake pedal displacement sensor.