The modern power steering system operates at extremely high temperatures and over 1,000 PSI of fluid pressure. The system has very small fluid capacity and no filtration. Under these conditions fluid rapidly breaks down and is contaminated with oxidation by-products debris and moisture. Symptoms such as groaning, whining, and erratic steering soon follow.
A powerful cleaner dissolves and suspends varnish and gums formed in the power steering system and then all the old fluid and contaminants are flushed from the system with high tech equipment while new high performance fluid is added to the clean power steering system.