No brakes or power steering.
 

Hi folks, I am new to this. I hope someone can help me out. My wife was driving our 2002 Astro when the power brakes and power steering went out as if the engine had died but it was still running.
Hydroboost is new to me. At first I thought the hydroboost would be the problem but I am wondering if could be a bad power steering pump.
Has anyone had experience with this? How would I diagnose to find out which one needs to be replaced. The p.s. reservoir is full. Master cylinder is good to. No leaks. Hope someone can help.