I have a hydroboost system in my 69 with a concept one power steering pump, when you press the brakes the unit makes an odd noise.Does anyone know if this could be due to bleeding issues? or maybe the reservoirs to small? There is no power steering on the car.if you remove the oil fill cap on the p/s pump and brakes depressed the fluid does go down a solid inch or so.
It is hard to know if you are having a similar problem to mine. I was trying to use the March billet ps pump/housing and it was making noise and ejecting fluid, we bled the system many times and felt certain we had gotten all the air out. However, problem was still there. We then had a larger reservoir machined to see if that would help. It did help a little but I still had problems with air/frothing getting into the system. After checking all the connections for leaks, changing out the ps pump itself inside the housing, I decided to go with an OEM setup and that finally fixed it. The issue had to do with either the machining or design(too much cavitation) of the March billet housing. It was allowing air into the system and/or frothing up the ps fluid so much it was starving the system. You can try a remote reservoir. Hopefully, that will fix it for you. My advice.....don't spend over $1,000 trying to fix it like me before going with something OEM.
Years ago I ran into this problem with oval track race cars. The PS fluid would swirl around and cause air to get in the system, etc. The fix was to place some foam that comes in fuel cells in the reservoir. PS fluid can still go through the foam and it solves the air issues and helps with PS foaming issues due to heat. You can buy the foam from Afco, and other racing places.
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