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You may have a internal leak in the master cylinder remove it from the hydro booster and check to see if there is any fluid coming out the back if not the inner seals are bypassing that's why you got no pressure.
Are you a diesel? If you are do the recall ,for the hydro boost (brakes) you sound like it.There is a recall on the hydro boost and yes this is a power steering assist, and a brake power assist
Recall I.D # 04045000
Excessive runout or wobble in a disc (Rotor) can increase pedal travel due to piston knockback and increase piston seal wear due to necessity of caliper to follow disc wobble.
Thickness variation in a disc can also result in pedal pulsation, chatter and surge due to variation in brake output when disc section is uneven. Dishing or distortion can be caused by extreme heat and abuse of the brakes. Hope this helps, Good luck.
It could be defective it just gets install make sure you have enough power steering fluid at the power steering pump, I have tow trucks with hydro boosters and they just get install and that's it. return it and get another one.Hope this was very helpful.
It could be any thing from the alternator to the Power steering pump. The power steering pump feeds the hydro boost unit. It is unlikely the hydroboost is causing the noise. I recomend you take it to the dealer and have them perform the proper diagnostics as they will have the proper pressure gauges and equipment needed to perform the tests.