Welcome
The first question
Is what chassis is it built ON
Is it Gas or diesel
Gas Ford with 460" motor
Or Chevy 454 on P30 work horse chassis
You lost power steering and brakes
Sounds line you lost power to the booster pump
Runs on 12v, possibly located right under the drivers feet, under side of floor outside, or nearby under the front hatch
No blown hoses, no hydraulic or power steering fluid leaking all over?
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s