Power Steering Hydroboost problem


New Member
Mar 21, 2019
Putnam, CT
ok. So here is my dilemma. I have a 2000 GT with Hydro-boost, of course. You probably already know where I am heading with this but wait, there is a twist. I put in a new steering rack, all Teflon seals have been replaced all the way up to the hydroboost manifold, there is a brand new steering pump as well and there are no fluid leaks anywhere what so sever. I have done the ridiculous 90 sets of turning the wheel from lock to lock along with pumping the brakes in between each set with the car off and front end raised off the ground, my forearms are huge now.!!!! It drank only a little bit of fluid and not much more. I tried running the car out of frustration and that did not help either. I am still getting a lot of whirring from the steering pump and the brakes still go to the floor while whining. I am so frustrated with this and have no other clue as to what it could be, maybe a bad hydroboost pump? any suggestions as to how to fix this crazy problem? Could there be an air leak somewhere that won't show signs of fluid leakage? I also forgot to mention I hear a gurgle coming from the steering rack when I turn left all the way to the lock while the car is ignition off. Driving me nuts here, any suggestions?
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Active Member
Sep 26, 2017
You need a new pump. Do not turn the wheels with the engine off. Fluid will shoot out the air bleed in the cap and air will be introduced. The air must be completely purged from the fluid before you can evaluate the pump for whine. The gurgle you hear is the fluid rushing thru the rack and pinion trying to cavitate because the engine is off. A properly working hydroboost unit only provides boost for a few brake pedal depressions before having to rebuild pressure. Meantime your power steering also suffers from lack of assist and if you force the steering to move the pump will whine like hell. Hydroboosts are a bit hard on pumps. Replace your pump and take your time purging the air. Elevate the front wheels. The book says twenty turns lock to lock will purge the air. I take about a half hour to do this and wait a few minutes for the bubbles in the fluid to go away before I move the steering to near the other stop. If you cavitate the fluid in the new pump it can tear up the vane and rotor and the pump will whine forever