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The hydroboost is run off your power steering pump that is power steering fluid leaking into your truck. Your brakes will feel normal until you deplete the power steering reservoir then you have manual brakes the power steering pump will start to whine when it gets low. You will not loose your...

Sounds like you have a bad seal in the hydroboost they always leak down the firewall and starts a puddle on the drivers side floor. Not a big deal unbolt the master off it and unbolt it from the firewall unpin it from the brake pedal arm and take it in to your local parts store around 140...