What are the causes of abnormal noise from the Audi power steering pump?

[AdamMarie]

Audi power steering pump produces abnormal noise due to the following reasons: Sound from the pressure relief valve during operation: This is a normal phenomenon. The power steering system generally has a pressure relief valve. When the system pressure reaches a certain value during driving, the pressure relief valve opens to maintain the system pressure within a certain range, at which time the flow of power steering fluid will produce noise. Solution: Check whether the noise is from the pressure relief valve during operation and rule out other faults. Insufficient power steering fluid: Long-term lack of power steering fluid can also damage the power steering pump, as the lubrication of the pump itself relies on the power steering fluid. Solution: Regularly check the fluid level of the power steering fluid to avoid insufficient fluid.