Steering and braking issue.
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Senior User
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Steering and braking issue.
Started up my 06 f250 this morning and drove a bit and went to put on the brakes , and they where sticky at the top of the pedal and didn't feel they they working very well. Then went to turn and the power steering wasn't working. After playing with them for a little, the brakes and power steering work they are suppose to if the truck is above idle. At idle, the brakes are sticky at the top and the power steering does not work. Will flushing the power steering possibly fix the problem? What fluid do I use? I had a 7.3 and used Mobil one synthetic tranny fluid. Can use that?
Thanks
Thanks
Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 25
From: Middle Tn.
I would try a flush first with about 4 qts. of Mercon V syn. If that works then install a magnefine inline filter in the return line. Cheaper than a pump but if it doesn't work it's probably pump time but it needed flushed anyway so no money lost.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
Brakes and power steering both work from the same pump.
Is the power steering working correctly now?
When you say sticky how do you mean that? Also try moving the
peddel with the engine off and see what it does. There is going to
be some reserve pressure in the accumulator for dead engine stopping
ability. If you don't feel this with the engine off it may be time to replace
the hydra boost unit.
Before replacing it I would make arrangements to get the system flushed
really well. You don't want leftover debris getting into a new unit.
Also like 69cj said get the magnefine inline filter for it to pick up any debris.
that flushing did not get. The steering box may hold some crud for a while
and that is why the filter.
Let us know if you need any more help and pleas report back on you
progress.
Good Luck
Sean
Is the power steering working correctly now?
When you say sticky how do you mean that? Also try moving the
peddel with the engine off and see what it does. There is going to
be some reserve pressure in the accumulator for dead engine stopping
ability. If you don't feel this with the engine off it may be time to replace
the hydra boost unit.
Before replacing it I would make arrangements to get the system flushed
really well. You don't want leftover debris getting into a new unit.
Also like 69cj said get the magnefine inline filter for it to pick up any debris.
that flushing did not get. The steering box may hold some crud for a while
and that is why the filter.
Let us know if you need any more help and pleas report back on you
progress.
Good Luck
Sean
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Thread Starter
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Senior User
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Power steering will not work every once in a while since I flushed the system. By sticky, I mean when I apply the brake pedal it feels like there is something binding or catching the pedal. Once I get past that, the brakes work and feel fine. Would the pump cause the pedal to catch or bind right at the top? I don't wont to start chasing things by replacing the pump, then the hydro boost, etc. any further thoughts as the problem? I was having a/c coming thru the defrost but that was a disconnected vacuum line. I wish all fixes where that easy.
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Fleet Owner
Joined: Apr 2012
Posts: 27,307
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From: Spanaway
Power steering will not work every once in a while since I flushed the system.
Meaning that it feels heavy?
That is sounding more like a problem with the
hydro boost unit.
You may still have crud in the system. There is an inline filter that you can
get for the power steering system and it sounds like a good idea in this case.
Sean
Meaning that it feels heavy?
That is sounding more like a problem with the
hydro boost unit.
You may still have crud in the system. There is an inline filter that you can
get for the power steering system and it sounds like a good idea in this case.
Sean
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
The binding could be one of two things.The hydro boost or the master cylinder.
Does the binding happen all the time?
What about with the truck off and after you pump the brakes to deplete the
reserve pressure. Does it still bind up?
What I think you may end up doing is disconnection the linkage and check
each part to see if it will bind. One thing you may be able to do is remove the
master cylinder and try and cycle the peddle and see if you get any binding.
Understand that it should move with a lot less force with the master cylinder
out but I think you will still feel and binding as you move the peddle by hand.
Also before you do get a good look at how the peddle is moving with truck running.
Just reach in and watch it while you apply hand pressure to the peddle. You might
see something.
As for the steering getting heavy I think that you may have some crap getting
stuck in the valve body of the steering box.
The real test would be with the correct test gear to measure the system pressures
while you turn the wheels stop to stop.
Is this truck on big tires?
Sean
Does the binding happen all the time?
What about with the truck off and after you pump the brakes to deplete the
reserve pressure. Does it still bind up?
What I think you may end up doing is disconnection the linkage and check
each part to see if it will bind. One thing you may be able to do is remove the
master cylinder and try and cycle the peddle and see if you get any binding.
Understand that it should move with a lot less force with the master cylinder
out but I think you will still feel and binding as you move the peddle by hand.
Also before you do get a good look at how the peddle is moving with truck running.
Just reach in and watch it while you apply hand pressure to the peddle. You might
see something.
As for the steering getting heavy I think that you may have some crap getting
stuck in the valve body of the steering box.
The real test would be with the correct test gear to measure the system pressures
while you turn the wheels stop to stop.
Is this truck on big tires?
Sean
Thread Starter
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Senior User
Joined: Jul 2009
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Nope factory tires. 275/65r20. Almost seems like two seperate issues? I have looked up under the dash and sprayed wd40 on the linkage thinking maybe it was binding there. But no different after doing that. I'll check out the master cylinder and post results. Thanks
