Ford MUSTANG Manual page 136

NOTE: Brake fluid and power steering fluid
CAN NOT be mixed. Only add brake
fluid to the brake master cylinder
reservoir. Only add power steering
fluid to the power steering reservoir.
3. Visually verify that the fluid level is above
the MIN line adjacent to the reservoir "sight
window."
4. If the power steering fluid is below the MIN
line, remove the cap and add fluid in small
amounts until the level is between the MIN
and MAX lines.
5. Reinstall the reservoir cap.
It is normal for the fluid level to be above the
MAX line after the brake pedal has been pushed
several times with the engine off. (If you want
to double check it; restart the engine and turn
steering wheel to full right turn, the full left turn
and then turn engine off and re-check fluid
level. It should be between the MIN and MAX
line.)
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