Depending on the type of vehical, a hydomatic system works with the brakes and Power Steering, thus one gives out the other may stop working as well.
hydraulic brake booster (power brakes)
Power steering pump failure, has power brake assist line conected to it. It uses the power steering pump to bring hydraulic pressure to master cylinder.
Brake fluid in the oil won't be much of a problem. It probably won't hurt anything, but to be on the safe side, just change the oil. In the power steering pump it will be harder to get out. You'll have to disconnect the high pressure line and let it pump out, then re-fill it with power steering fluid.
your power steering fluid return line, also known as your power steering low pressure line, may have a hair line crack in it and need to be replaced.
Hi-pressure power steering line
draing power steering fluid before changing high pressure line silverado v8
power steering line adaptor assembley
two bolts in the steering knuckle and the brake line are all that attach to the brake caliper
Have you checked the power steering pressure line?
Usually the leaks are at the high pressure line or the return line of the power steering pump. Tighten all the lines at the pump.
Noise may be heard in a power steering line when the power steering fluid is low. Low power steering fluid may occur due to a leaking power steering pump in most cases. If the pump is not leaking, then the fluid needs to be added.
reroute the line around the power steering cooler