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Q: Why do I loose power steering and brakes when i press the brake pedal? on 1996 Chevrolet Astro

I have just replace the power steering pump. We drove the vehicle a few miles and lost both power steering and brakes again when we pressed the brake pedal.
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I have not worked on this type of system before. Please explain the hydro-boost system. I do have some mechanical training. Are you saying the hydro-booster could be bad? you have a vacuum brake booster OR a metal one with a lot of pipes and fittings?
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