Bleeding the power steering box?

[yellowblazer1969]

How do i bleed the power steering box on my 72.

thanks

[68gmsee]

Did the previous information not help?
http://67-72chevytrucks.com/vboard/s...power+steering

Remember, you cannot do this until your engine is running and your ps setup is functional. But, there's really not much to it. Just fill up the ps box as you normally would and start the engine up, turn in both directions to the stops several times, recheck fluid level, and you're done. Some recommend jacking the front end up.

If you're having other problems let us know.

[Hawker7]

I think he was asking how to bleed the pump on the previous post. He is asking how to bleed the box now.

[68gmsee]

I guess it's the terminology...

Anyway, yellowblazer, the principle is the same. The ps pump and the ps gear box are bled as a unit after they're hooked up and running.

[yellowblazer1969]

just wasnt sure got the pump up and running but am installing a new box today and have heard the box should be bled seperately, i just dont know. so is it just raising and turning the wheels back and forth after its all hooked up?

[BLACK AND BLUE 67-72]

Yes that is all there is to it, jack up the front end (it makes it easier to turn the wheels), start the motor and turn the wheel lock to lock several times, check you fluid level and that should be all there is to it!!!!

[mr48chev]

Yep, when I was rebuilding them on a regular basis that is what I did.
As said it is easier on the system and quicker if you have the front wheels off the ground or floor and run the rig and turn the wheels lock to lock several times slowly.

B&B types faster than I do lol.

[big_al_71]

When I did mine all we did was side to side check refill side to side check refill and I was done. Less than ten minutes.

[Green Machine]

I might respectfully disagree about having the engine running. Hook up all your lines first, bleed pump and box together. Best results for me is to get the front wheels up and turn the wheels full left and right, 5 to 10 times, keeping an eye on the fluid level with the engine off. Then start it and repeat.

Anytime I've tried it with engine running, without doing the engine off procedure first, the pump just whines and puts air bubbles in the oil foaming it up, then it has to sit a long time for the bubbles to work out. JMHO.

[68gmsee]

I guess whatever works for you regarding engine on or off. I've always had good luck just filling up with fluid, starting the engine, let it warm up some and start the steering wheel one way and then the other slowly and rechecking the fluid. If you do a search on bleeding power steering pumps you will find differences of opinions.

Here's what the Haynes manual says:

2. Open the hood and check the fluid level in the reservoir, adding the specified fluid necesseary to bring it up to the proper level.

3. Raise the front wheels off the ground.

4. With the power steering pump and fluid at normal operating temperature, start the engine and slowly turn the wheel several time from left to right and back again, lightly contacting the stops. Check the fluid level, topping it up as necessary until it remains steady and no more bubbles appear in the reservoir.

[yellowblazer1969]

Thanks everyones help is much appreciated. Back on the road and headed in a straight line again. Worked like a charm.

[Murphy IRE]

old post, but it has lots of info and posts.
I installed a hydraulic brake booster to the system from ABS power brake . No noise before this install. I've done the engine off and on. back and forth, probably 40-50 times. It has been sitting for days on the jack stands. Still have problems when applying the brakes. I get some Squawking and some cavatating while turning, but not as bad as it was. On the first day it was very foaming. Today as I turned it back and forth (engine off) I could hear a soft whistling and there was fluid on the ground. It was at the low cold level full mark. Thoughts?