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i just put new hydraboost and cant get all air out of steering pump
i have a 96 gmc 3500 duelly 2wheel dr with 6.5 .i got tires off the ground and been turning left to right
for days now and still lots of air bubbles,now i just noticed that my rear drum has a piston leak,,,,can that cause
all that air to go into power pump
 

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Welcome to DieselPlace
(y)
 

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Welcome. HydroBoost is powered by the P/S also.
Fix the brake leak and bleed the brakes.
By then most of the air should be out of the hydroboost system.
Brake fluid and P/S fluid are completely separate systems.
 
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1995 Chevrolet Silverado Z71 6.5 TD
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i just put new hydraboost and cant get all air out of steering pump
i have a 96 gmc 3500 duelly 2wheel dr with 6.5 .i got tires off the ground and been turning left to right
for days now and still lots of air bubbles,now i just noticed that my rear drum has a piston leak,,,,can that cause
all that air to go into power pump
No, your rear brake wheel cylinder is brake fluid not power steering fluid if its the hydro-boost your still referring to.
 

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Are you running your engine while turning wheel r to l? Wheels should be off the ground. Idle aprox 1000 rpm. Than bleed by turning wheel. May take 20 or more full r to l cycles to bleed all the air out. Also pump the brakes a few times. Dont let the pump run dry.
 
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Sometimes you have to let it set a while so all the air can settle out. Once the air gets wiped up it's almost impossible to purge all the air out as it stays suspended.
 
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