What causes power steering fluid to foam?
It could mean it’s time to change the fluid in the power steering system. This is best done by a professional shop that can properly flush and purge the system. I would advise spending a few dollars extra for SYNTHETIC power steering fluid as it lasts longer. Your vehicle should never “use up” power steering fluid. If it’s low you have a leak somewhere and it needs to be addressed ASAP. If you let the power steering pump run with low fluid you will ruin the pump very quickly.
