Bad news. The power steering fluid or any petroleum based or mineral spirit based fluids will damage all rubber components in the Braking system, causing them to swell. Unfortunately, You will have to replace all components of your braking system. Master Cylinder, calipers, wheel cylinders, all rubber hoses , ABS Hydraulic Assembly at considerable expense and flush all of the brake lines throughly. Note: master cylinder, calipers and wheel cylinders can be reconditoned, however replacement of these components is usually the normal practice in most dealerships..