Bleeding Power Steering w/Hydroboost???

[Shibbershabber]

Had to replace the PS pump and decided to just replace everything including the Hydroboost to gearbox line.

My Haynes and Chilton manuals dont even show my PS pump in the book.

Assuming all hydroboost systems use the PS pump with the remote reservoir?
Well, the book only shows the reservoir-on-pump models.

Is there a different bleeding method for the PS due to the Hydroboost?

Do I need to do the PS system AND the hydroboost since I also disconnected lines @ the HB??

Got it all finished up, filled it with fluid and fired it up to see if anything leaked or exploded... its getting kind of late and well... yeah.

SO... what next? Just turn the wheels lock to lock until it smooths out?

[DieselSJ]

You need to bleed the hydro as well. Pull the return line where the hydro returns to the pump and stick it into a bucket. With the engine running, pump the brakes. You will see that every time you release the pedal you will get fluid out of the return line. Do that until each time it squirts you get a nice stream, then reinstall the return line. Now you can go ahead and bleed the steering box as normal.

[mongocanfly]

I didn't have to bleed anything on mine...filled with fluid turn lock to lock, pump the brakes a few times and I was good to go...well I mean stop..

[Shibbershabber]

How important is having the wheels off the ground?

Last time I did a PS pump I wasnt able to lift the car and just did it with wheels on the ground, seemed to be just fine...

Admittedly just being lazy now, but how necessary is it?

[mongocanfly]

Mine was on the ground..

[Tash4]

I agree with mongocanfly , i did the same thing with my 82 , wheels on the ground.

[Shibbershabber]

Originally Posted by DieselSJ

You need to bleed the hydro as well. Pull the return line where the hydro returns to the pump and stick it into a bucket. With the engine running, pump the brakes. You will see that every time you release the pedal you will get fluid out of the return line. Do that until each time it squirts you get a nice stream, then reinstall the return line. Now you can go ahead and bleed the steering box as normal.

That would be the rubber line between the HB & pump... Not the threaded line

So which end goes into the bucket? Pump side or HB side?

[DieselSJ]

Originally Posted by Shibbershabber

That would be the rubber line between the HB & pump... Not the threaded line

So which end goes into the bucket? Pump side or HB side?

Correct, not the threaded lines. There is a small stub on the HB that a short piece of rubber line is connected to. Just run a longer piece from that to a bucket.

[Shibbershabber]

Okay.

So I took the rubber line from the HB (which goes to pump) and with one end in a bucket I pumped the brake until a steady stream came out upon releasing the pedal.

I reconnected it, topped off the reservoir and began turning the wheels lock to lock slowly.

Sounded pretty good, so I checked the level and went for a drive.




Stopping felt fine, though later in the trip I did notice the humming when applying the brakes and the steering was a little whiny BUT seemed to operate okay.

Was I supposed to plug the opening at the pump where that HB line went to? Was it sucking air when I was shooting into the bucket?

Or do I just need to keep turning the wheel back and forth?

Thanks

[hatzie]

Humming and whiny sounds like you may be a little low on fluid.

[DieselSJ]

Originally Posted by Shibbershabber

Okay.

So I took the rubber line from the HB (which goes to pump) and with one end in a bucket I pumped the brake until a steady stream came out upon releasing the pedal.

I reconnected it, topped off the reservoir and began turning the wheels lock to lock slowly.

Sounded pretty good, so I checked the level and went for a drive.

Stopping felt fine, though later in the trip I did notice the humming when applying the brakes and the steering was a little whiny BUT seemed to operate okay.

Was I supposed to plug the opening at the pump where that HB line went to? Was it sucking air when I was shooting into the bucket?

Or do I just need to keep turning the wheel back and forth?

Thanks

You did fine. Just make sure your reservoir is topped off and cycle the steering again a couple times.

[NDM]

This is an old thread but I wanted to share a very helpful tip.

The best thing that I did to bleed my hydroboost is drive it! I suffered through the heavy brakes and steering after I did the bleed procedure and as of this morning, I left the house very hard to steer and about 3 min into my drive it miraculously became night and day better. By the time I got to my destination which was about 2 hours, I felt like I was driving my wife's modern car. When I got back home, I was smiling from ear to ear at how well the brakes felt.

So my advice to anyone struggling to bleed the hydroboost is do a good cycle of back and forth as folks suggest but then warm the vehicle up and just drive it. It is honestly unbelievable how different it is with all the bubbles gone. Be sure to top it off too.

[v30crewcab]

I always struggle with lots of air in them. so I turn it to one side with the engine off. start the engine for just a second and shut it back down. its probably bubbling in the reservoir. let it sit an minute, then turn it to the other side slowly, start it for a second and shut it back off. I do this until it quits bubbling in the reservoir. then you're good to go. just driving it doesn't always get out the bubbles, and it will bubble up and overflow alot of times, then your low on fluid and it'll groan and bubble more.