Fault Phenomenon: Komatsu GD655 grader steering wheel vibrates during braking, braking performance decreases.

Troubleshooting Process:
– Checked brake disc: disc surface blued, uneven thickness, thermal deformation.
– Checked operating habits: prolonged partial braking while driving.
– Checked caliper: caliper piston sticking, causing drag.
– Checked cooling: wheel hub ventilation holes blocked.

Root Cause: Poor operating habits caused the brake disc to overheat for extended periods, resulting in thermal deformation (warping) and brake judder.

Required Parts: Replace brake disc and pads, inspect caliper.