Posted 19 October 2013 - 07:45 PM
Both are Hydraulic fluids.. with differing properties..
The two major oil-based fluids in a vehicle are either: lubricants, or hydraulic fluids.
Both.. Brake fluid and Power Steering fluid are classed with Hydraulic fluids.
Although they will have *some* lubricating properties (for o-rings & seals), as well as differing properties, and additive packages depending upon their intended function, and specification.
Major differences..Power Steering fluid: high boiling point, low freezing point.
Brake Fluid: very low compressibility, high boiling point.
I would suggest a thorough purge of the fluid before refilling and be observant for any leaking/damaged seals.