The system has a mix of steel piping with high and low pressure rubber hoses. The rubber will eventually perish and leak. Obvious clues are puddles under the car and difficulty with steering effort. If you suspect leakage, look underneath the front of the car for a pool of fluid. Do not continue driving the car, because you could damage the pump. Replacing the pump is expensive, but reconditioning might be a more costeffective possibility.
It’s best to contact hydraulic-system specialists if you have a problem, as they will know the systems backwards and hopefully will offer efficient service without going through middlemen or dealers who, lacking the necessary testing equipment, will merely pass the car on to the experts.