Fault Phenomenon: Shantui DH52 drives straight when cold. During high-speed driving (operating temperature), the vehicle pulls to one side, is difficult to correct, and eventually becomes dangerous.

Troubleshooting Process:
– Checked tire pressures: pressures consistent.
– Checked toe-in value: normal.
– Checked steering linkage: no looseness.
– Measured left and right brake wheel cylinder pressures at operating temperature: found pressure inconsistent.

Root Cause: The piston in one brake wheel cylinder sticks due to heat, causing drag and pulling.

Required Parts: Brake wheel cylinder repair kit.