99 F350 Lost PS and Brakes - Ford Powerstroke Diesel Forum
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Old 10-09-2011, 07:09 PM
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99 F350 Lost PS and Brakes

Hey fellas, I am hoping someone can help me out here as I am stuck home and unable to work.

I own a 99 Ford F350 PSD 4x4, Crew Cab, Extended Bed.

When I bought the truck, about a month ago, I have noticed since the purchase, that my power steering would not work when the brakes were applied or when I was sitting still. Granted hoping this was normal as the truck is lifted and has oversize tires, I thought it was something I'd have to get used to.

Coming back from Ontario, Ca to Turlock, Ca (a 6 hour drive, through highways and mountains) everything went smooth and OK. However, the next day, I drove the truck and immediately noticed that my brake pedal went to the floor with little stopping power behind it, and I also had no power steering.

I bled the power steering and got a solid stream of fluid, without any bubbles. Now I have ZERO brakes. All lost.

Is it my hydro boost? Master Cylinder or Power Steering Pump?

I am leaning towards my power steering pump.

Any help and input is extremely appreciated.
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Old 10-14-2011, 02:56 PM
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Since its both at the same time, and that back story about you brakes and steering not working at the same time, I'd agree that I would look at the pump, or possibly a clogged line. You are losing pressure somewhere.

So even if you stand on the pedal, you have no brakes? The reason I ask is that the hydaulic brake booster and the actual brake system should not be connected, kinda like a vacuum booster on a 1/2 ton or car. Even w/o the power assist (which is all that the hydro booster is), you should still have VERY hard to engage brakes. Hope this helps!
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Old 10-15-2011, 03:46 AM
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Thank Muppet for the reply.

Since the problem appeared, I have replaced my power steering pump, high pressure line coming from PS, and then my power steering was fixed, however my brakes was another issue. I simply swapped out the MC and now all is well.

Thanks for the help!
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