Can't get power steering and brakes to work. Replaced pump, hoses and pulleys. Power brakes don't work and power steering failed. All new parts except where hoses attach to booster, but that was working before. Don't know what the problem is. Can U help?

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Belt seemed to be squealing so I replaced the water pump, and kept making noise. Replaced AC condenser and filled with coolant, made noise still replaced power steering pump and hoses for brakes too. Now don't have power brakes or power steering and trans is slipping too. I need some guidance please?