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i just replaced my steering gear box and now i have a hard brake pedalon this paper that came with the gear box it says there is air in the hydraboost. what does that mean? air in the steering system perhaps? thanks
 

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1976 Eldorado project
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The Hydroboost is the hydraulic brake booster. It is run by the power steering pump and assists the power steering and power brakes.
 

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'80 Fleetwood Coupe, 1994 and 1995 Mercedes 140 Coupe
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Fill the power steering pump, start the car and pump the brake a few times. It should bleed any air out. Make sure the pump stays topped off. The PS pump also provides brake boost on that system.
 

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my 76 sedan deville also has a very hard tight brake pedal with little travel, Could this be the problem for me also? just fill the power sterring to the top and leave the lid off and pump???
 

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1970 Sedan deVille hardtop
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That will only solve it if you have a hydroboost brake setup. If you have lines going from the p/s pump to the master cylinder then you have hydroboost. If you have a big round thing (brake booster) behind the master cylinder, then you have vacuum assist, not hydroboost and filling the p/s pump will only keep the steering happy. A hard brake pedal on a vac assist car is more likely a bad vacuum booster, or a missing vacuum line from the engine to the booster.
 
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