[Chrislong]

Id say it isn't good. By the nature of the brake fluid, it cannot be compressed within operating temperature (always use the highest grade stuff) and has a high boiling point, only when it boils does air get in and the peddle goes spongy because air compresses - result = no brakes, brake fade.

So with a different fluid, you will have altered that characteristic. id suggest getting the brakes bled ASAP, and don't do anything which might warm the fluid (braking hard on motorway, driving hard on A roads). I don't know the characteristic of power steering fluid, but I do know that if it was suitable as brake fluid - well, we'd be buying "Brake & Power Steering Fluid", like 2 in 1 shampoo.

Im sure somebody in the motortrade will confirm or expand on that, but anything which risks compromising your safety, don't hesitate to fix it mate, I don't want to hear that you got hurt.

Chris