What caused my power steering and brakes to quit working properly? on 2002 GMC Safari

When I got home yesterday, my steering and brakes worked fine. When I started the van this morning, the steering was VERY difficult and the brake pedal was very stiff. What causes this problem?

Asked by for the 2002 GMC Safari
Your 2002 GMC Safari van uses the same power assist source for the brakes and the steering - the power steering pump. Make sure nothing has happened to the serpentine belt and the power steering pump pulley is still turning. Check the power steering fluid level. If all the above check out OK then it could be that the pump has failed.