Question Power steering/power brakes

[Mobile Welder]

I am new to this forum so I hope I put this in the right place. Heres my problem.

I have a 99 7.3SD. The other day I thought my ABS was acting up becauase the pedal would pulsate just like ABS but it did it whenever I pressed on the brake even at a dead stop. It also did it when turning. So I figured I had 2 problems ABS and low power steering fluid. Sure enough the power steering fluid was really low. I then learned that the power brakes is powered by the power steering. I fillid it up but it is still pulsating it I press the brake pedal. Is it just air in the system? If so will it work it self out or does it need to be bled out and is there a bleading procedure. Or sould this be something else all together?

Sorry I posted this before in the wrong area aince my truck is a '99.

Any advice would realy help I have only owned the truck for a few weeks and am not to familuler with diesels. Thanks

 

[JLDickmon]

I am new to this forum so I hope I put this in the right place. Heres my problem.

I have a 99 7.3SD. The other day I thought my ABS was acting up becauase the pedal would pulsate just like ABS but it did it whenever I pressed on the brake even at a dead stop. It also did it when turning. So I figured I had 2 problems ABS and low power steering fluid. Sure enough the power steering fluid was really low. I then learned that the power brakes is powered by the power steering. I fillid it up but it is still pulsating it I press the brake pedal. Is it just air in the system? If so will it work it self out or does it need to be bled out and is there a bleading procedure. Or sould this be something else all together?

Sorry I posted this before in the wrong area aince my truck is a '99.

Any advice would realy help I have only owned the truck for a few weeks and am not to familuler with diesels. Thanks

are we talking pedal pulsing while driving, or pedal pulsing while stopped/turning?

to answer one of your questions, the bleeding procedure is turn the steering wheel lock to lock (all the way left, to all the way right) 30 times

anything else is going to depend on the answer to my question..

 

[Mobile Welder]

It does it when mostly when slowing down or when turning and when completely stopped. It does it when I aply firm pressure not when touching it lightly.

 

[Mobile Welder]

Could the power steering pump itself be the problem? I am really starting to think that its not just a bit of trapped are. When I turn it from stop to stop without the vehicle moving it gets harder and harder like my old truck with manual steering. Are there any other possible causes for this?

 

[sagebel]

It does it when mostly when slowing down or when turning and when completely stopped. It does it when I aply firm pressure not when touching it lightly.

Could possibly be the pump. When slowing/stopped, engine rpm is down and not spinning the pump as fast. When stopped, shift to neutral and bring the rpms up. See if you still have the same symtoms.

Scott

 

[JLDickmon]

It does it when mostly when slowing down or when turning and when completely stopped. It does it when I aply firm pressure not when touching it lightly.

makes me think it's got a bad ABS sensor or lead wire messing with the ABS unit..

warped brake rotor is going to be more rotational with the wheel..

bad PS pump is going to make the steering high effort, and the brake pedal rock freekin hard...

is the pedal low or mushy?

note: I'm still trying to get moved, so unless someone else can pick up this ball and run with it, it might be next week before I'm back on line...

 

[Mobile Welder]

I origanaly thought ABS to but pulled all the ABS related fuses and even disconected the wheel speed sensor and still the same problem. Plus you can here what I believe it the power streeing pump making noise when it does it. But it doesn't seem to do it when I am on the freeway. In neutral at idle the steering is realy hard. With the exception of this morning when I went to work but it was realy cold out.

 

[jestersv]

still sounds like air abs would through abs light cold fluid would have smaller bubbles = less pulsing when cold

 

[BIG JOE]

still sounds like air abs would through abs light cold fluid would have smaller bubbles = less pulsing when cold

x2.

I'm think'n it's time for a new PS pump.

 

[Zookie400]

pump pump pump.......

steering pumps arent very durable units when it comes to pumping air. i did a really long "staging burnout" in my wifes mustang.....held it at 5500rpms too long, the ps fluid aerated and wasted the pump almost immediately. i drove another 1/4 mile to the first stop and realized i had no brakes or steering.