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Old 01-27-2009, 06:40 PM
6spd 6spd is offline
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99 F350 power steering flush

When researching how to preform a power steering flush I understand that there is two different suggestions on how this is to be done.
1) remove the return line off the P/S cooler and point it down and place a large drain pan under it. have a buddy start the truck then pour new ATF in the fill port. do this for about 30 seconds. then shut it off. hook up the hose and add some more ATF. idle it and check the level.
2) to flush, remove the hose that comes out of the reservoir for the PS pump. follow that out of the top of the reservoir (it is the one coming in the top of the reservoir. follow the hose to the booster, it will go up above the booster and make a 180* turn. disconnect the hose at the booster, and put a clear piece of 3/8'' ID hose over the nipple and run it over the fender, down into a pan/bucket. get someone to press the pedal firmly but slowly, and turn the steering wheel several times while you keep filling the RS pump reservoir. the fluid will start out as a "rootbeer" color and eventually turn to a cherry/grenadine color when you are finished. Which way is correct, or do the accomplish the same goal.
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Old 01-27-2009, 07:02 PM
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I vote #2. That's how I've done it on a few trucks. This may make it easier to understand.

Power Steering Fluid Flushing Procedure For F250 Superduty Truck
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Old 01-27-2009, 07:13 PM
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Thanks F350-6 . That is a great , the pics help me understand how the procedure looks, and also exactly what P/S line to attach the drain line to. That is the way I will do it . THANKS
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Old 01-27-2009, 07:38 PM
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Originally Posted by 6spd View Post
Thanks F350-6 . That is a great , the pics help me understand how the procedure looks, and also exactly what P/S line to attach the drain line to. That is the way I will do it . THANKS
Pictures always make things easier to understand. I used 4 qts. since I don't see colors too well and I have no idea what color grenadine is.

That hose clamp is kind of a pain to get off with the clutch reservoir in the way, but it can be done. I used Mobil 1 synthetic and it firmed up my brake pedal a little.
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Old 01-27-2009, 07:53 PM
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I posted the other day about a random pulsation while braking and I was instructed to flush the P/S fluid and that maybe where the problem is. After work today I checked the P/S fluid , and the problem was clear or should I say dark brown to me. The fluid not only was noticeably dirty but had a ugly smell as well. That being said new P/S and a BRAKE system flush is already in the works.
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Old 01-27-2009, 07:58 PM
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Sounds good. Make sure to follow up in your old thread with the results in case someone else finds it down the road using the search function. It's always better when we have threads that have the results posted in them too.
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Old 01-27-2009, 08:05 PM
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Good to know. I had never even thought about doing that , but it that would be helpful for the next guy for sure. Thank you for all your help , and I will report back with my results.
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Old 01-28-2009, 09:23 AM
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I used method 2 and had the buddy (wife) turn the wheel about 20 degrees L/R and pump the brake to allow the fluid to flow through those. I added new fluid with the engine running so the pump never went dry. This pumped out the old fluid into a bucket. Really smoothed out the pump/noise and pulsations.
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Old 01-28-2009, 10:38 PM
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Well today I flushed out the P/S fluid. I used 3.5 Qts during the flushing process and then used part of the 4th quart to top of the reservoir. While I was in the flushing mode it seemed to be a good time to flush the brake system as well. With both those jobs out of the way it was time for the road test. I drove approximately 4mi R/T and included some fairly step down hill grades. As of now all the pulsation is gone but the best part is WOW my brakes feel like BRAND NEW. The advice I received from FTE was right on. I used the #2 method for the P/S system and followed the procedure F350-6 suggested and it worked out to be easier than I thought. The only change I made was were I put the drain hose. I used 3 ft of 3/8 clear hose over the fender onto a step stool and in to 1 gal old antifreeze container. I simply drilled a 3/8 hole into the lid of the container and pushed 2 inches of the clear hose inside the lid, then fasten the other end of the hose to the return line and then I started up the truck. I checked to make sure the reservoir was full and because I did this procedure alone I found was able to pump the brakes 12 (easy and steady) times then refill the reservoir until the the fluid running through the clear hose looked the same color as the new fluid. Using this link Power Steering Fluid Flushing Procedure For F250 Superduty Truck was a perfect example on how to do a P/S flush that I have seen. Thanks Again F350-6 your info kept me from wondering if I could do it, to doing it.
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Old 01-29-2009, 06:39 AM
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That's great to hear. Make sure you also follow up in your other thread http://www.ford-trucks.com/forums/81...ml#post7055797 so if it turns up in a search later, they know the flush did the trick for you.
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Old 01-29-2009, 06:39 AM
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