Welcome to 2CarPros.
This is an interesting one because the power assist to the brakes is vacuum operated, and the power steering is run by a pump and not associated with the power brakes. For you to lose power assist to the brakes, there has to be a drop in engine vacuum or a faulty brake booster. For the power assist to stop, the pump has to be running extremely slow or the serpentine belt stopped turning the pump.
The only correlation I can think of without being there is the engine nearly stalls or the idle is extremely low. Can you tell me if idle speed is low when this happens? Also, is the check engine light staying on when the engine runs, which could indicate a vacuum leak?
Let me know. Also, let me know if there is anything you can think of that may help me better diagnose the problem.
Take care and I will watch for your reply.
Tuesday, March 12th, 2019 AT 6:11 PM