V6dreamer is right on the money.
However, sometimes if the belt is really old, the rubber will become slippery. When I was doing vacuum pumps for belt driven units we had to sand the belt surface of the pulley in order to get more bite out of them. Sand them perpendicular to the orientation of the belts, to make some teeth out of the pulley. When in doubt replace the belts with new ones, clean the pulley surfaces, follow V6dreamer's advice and replenish the fluid. If your P/S system has a tensioner it might also be due for replacement if it's not putting enough tension on the belts. Then tighten the belts to spec, overtightening will destroy the bearings.





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