Bubbles in Power Steering Reservoir - Replaced Low Pressure Hoses. What's Next?

Joined
Oct 21, 2007
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Greetings. New-to-me LX450. Great shape. About the only thing I've noticed mechanically is a bubbling PS reservoir. The 3 low pressure hoses are brittle so I replaced them this weekend with one of the kits floating around. Flushed until nice and clean with new ATF and bled it. No change. What's next? Replace the rubber and metal section of high pressure hose? I'm wondering if the crush washers on the banjo fitting or a gasket in the power steering pump are the culprit for allowing some air in.

Something else I want to mention--the steering feels too heavy to me - definitely heavier than my '93 LC I had before this '97. However, maybe I'm just used to my 2005 100-Series or my 2016 Tundra? I dunno though, seems too heavy. Is it worth it to repalce the pump? If I'm gonna pull it anyways to reseal it (based on what you tell me about where leak my be coming from), I'd prefer to just replace it. Other idea was possibly trunion bearings? Thanks!

Video below of the bubbling.

 
Joined
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I just replaced all hoses also and will be doing this tonight hopefully. Jack the front end up and put on jack stands. Drain your reservoir and cap the small hose side at the reservoir(I’m using a small piece of old hose but with a bolt in the end with a hose clamp on each end. Now fill the reservoir back up and run the hose you disconnected into a receptacle of your liking. Don’t start your truck or you will find out why! Have a helper turn your steering side to side slow is smooth while you watch the reservoir and fill with more atf don’t let the power steering box loose it’s prime keep the reservoir full so this until you have nice clean fluid and all the air is out. Job completed 🤙
 
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If you read my post, I've already flushed and bled the entire system after replacing the 3 low pressure hoses--I know how to do all of that jazz. I'm looking for options beyond that now to find the leak that is allowing air into the system. Anyboy else want to chime in? Time to replace the high pressure hose section and reseal/replace the pump?

Thanks!
 

smritte

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I didn't see bubbles in the video, I saw fluid movement. If you were pulling air it would have foamed quick and made a huge mess. As to your hard steering, I replaced my pump last year when I did a rebuild. I was surprised how much better my steering felt. My pump had more wear than I thought. II rebuilt at about 200k.
 
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The Saratoga slums, CA
^^ I agree. I see normal fluid movement but I don't see bubbles in your video. Typically if there is air in the system you will hear a screeching sound while turning the steering. you should also see evidence of foaming after running the engine for awhile. Do you have those symptoms?
 
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I've read a lot of posts about foaming, etc but have never seen that with mine. Sounds like I have no leaks but just a weak pump. I'll replace. Thanks for the knowledge.
 
Joined
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Oregon
Sorry, @Fj80oregon, that reply to you didn't come out right. I should have reworded. Have a good week.
No worries I read your post it just didn’t compute in my small brain that you had done a proper flush. I have seen guys on hear just refill fluid after new hoses and think that’s a flush! Glad you got it figured out! You have a great week also🤙
 

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