Hydroboost pulsing

[bluegoat01]

Ok so about 2 months ago I resealed my hydroboost using the moparman recommended guide and solve a leak problem but before I could do that my wife drove the truck around 70 miles and 65mph or higher which lead to the death ofy original power steering pump. Having replaced the PS pump the HB unit makes lots of noise when turning the wheels and pulses the brake pedal fairly hard when the breaks are applied. I've flushed the old fluid out. Jacked the front wheels up and turned them lock to lock, and tried my best to avoid any foam. I thought the problem had been solved but a 5 minute drive proved otherwise. Any thoughts on this? Or tricks I haven't tried?

[Mopar1973Man]

Was the system flushed before installing the new pump?

[bluegoat01]

Not entirely but there was lots of fresh fluid in the pump from all the timessential it was refilled due to the hydroboost leak. So I would say the fluid was probably 75 percent new. And I forgot to mentioned if the engine is spinning more than 1100 rpms the problem almost goes away.

[bluegoat01]

Not entirely but there was lots of fresh fluid in the pump from all the timessential it was refilled due to the hydroboost leak. So I would say the fluid was probably 75 percent new. And I forgot to mentioned if the engine is spinning more than 1100 rpms the problem almost goes away.

[joecool911]

Are you sure you don't have a warped rotor?

[bluegoat01]

No the brakes work just fine it's the brake pedal that pulses and the steering wheel getshutters a little hard to turn until I give it some throttle then the pulsing stops the wheel turns like normal and any noise it was making stops.

[Hawkez]

Give us details on the truck.

 

Is the noise and pulsing only when the brakes are applied?  I had a bad rotor a few months ago and I thought it was my steering.  My pads were shot as well as the rotors.  Some of the symptoms you are I seeing are similar to what I had.

[bluegoat01]

I can be in park and depress the pedal and get the pulsing. I have had the hood popped and could see the hydroboost vibrating. It's definitely not my rotors or pads.

[bluegoat01]

It's a 2001 2500 CTD 2wd with 235xxx miles

[rburks]

Are they any foam in P/S Canister when running engine???  Sounds like you have air in sys.. 

when you bleed the system you can't hold it against the locks any ...its best to just turn the wheel back and forth,  1/2 turns and press the brake every few seconds assuring you don't pump the canister dry before refilling... also be sure your removing the return line from the hydrboos to P/S pump to flush

 

i used a empty water bottle that way i can make sure I'm not pumping out more than I'm putting in

[bluegoat01]

There was a little bit of foaming in the beginning but nowe there is none. I figured air is the culprit. So I should pull the return line, lift the front end, and make half turns instead of lock to lock. Also I did refill it with a low buck fluid. Could that be causing problems?

[rburks]

well i don't think cheep oil is issue, if bleeding doesn't do it, then.. ..I 'D say if it were me i would be looking at hydra boost unit,,Makes sense that you had a leak issue, "BRAKES STEERING WAS FINE"//???/ ...Then you "RE-SEALED IT as you stated above and now you have issue...im gonna say you missed a step or like maybe pinched a o-ring or something that making it bypass or its just crapped out IM only guessing at whats malfunctioning inside hydra boost IDK,,,,BUT I'd bet money that the hydra boost is the culprit

[bluegoat01]

I'm gonna guess that its gotta be air. Because the hydroboost worked fine after I did the re seal until the PS pump went out. I guess I need to jack it up and start trying to flush out the air.

[rburks]

***P/S when you bleed it this time and you take return line off"at the PS PUMP  Make sure its the return from hydra boost unit,, it will ave clamps because its low psi.  GET SOMEONE TO PUSH BRAKE PEDAL WHILE YOU WATCH FLUID..SEE IF IT PULSATES WHEN BRAKE PEDAL IS PUSHED

IF YOU stick hose in a clear bottle you will be able to see the air..

Edited July 18, 2015 by rburks

[bluegoat01]

Ok I'll give that a shot and see what happens thanks for the help!

[rburks]

FIND a piece of hose to slide up on the barb fitting on PS pump and then shove a bolt in the end to plug off so it won't leak and force fluid thru the booster

 

Micheal done a article years ago on this, thats how i knew this

Edited July 20, 2015 by rburks

[Mopar1973Man]

Thing is the fluid might be changed out but did you flush the debris out of the system? Is it possible you got debris in the hydrobooster because of the pump failure?