What are the causes of Audi power steering system failure?

[StZoey]

Audi power steering system failure causes are introduced as follows: Steering gear oil leakage: The oil leakage locations are generally at three places - the upper cover of the steering gear, the connection between the steering shaft arm, and the side end cover. Difficult steering return: Mechanical parts of steering system, lack of lubrication causing wear between the steering knuckle kingpin and bushing, lack of lubrication in the universal joint connecting the steering wheel and steering gear. Heavy steering: Steering gear failure, power steering pump failure, lack of oil, air in the system, failure of sealing rings in two limit valves causing communication between piston chambers leading to power assistance failure, clogged return oil filter in the reservoir tank, etc.