OK, so you guys have been so amazingly helpful to me in solving my LS400 steering issues, I thought I would give a little back. My slow speed steering was making noises and was hesitating. So here is stuff I have learned: See photo attached. This is the filter screen that goes around the solenoid. By the time I took this photo I had already cleaned off an almost 100% clog, every screen window was clogged. Also, my guess is that the clogs caused the screens to bust through to flow what fluid I was steering on. Most likely this part caused my issues. Does Lexus sell this miserable little part? Not that I could find. Sooo… my thinking was that if I ditched (eliminated) the screen completely, the hydraulic fluid would flow without restriction, albeit unfiltered. Use a tooth pick to remove the upper o ring from the solenoid, then just work the nylon screen circle off. I reasoned: what good is a clogged screen with holes in it? Mine probably hadn't done much filtering for a long time. My thinking also was that it is relatively easy to get the rack rebuilt, also new hoses and pump are now cheap on ebay. Important: I had my rack rebuilt. The rebuilder didn't have this screen as part of the rebuild kit, so he reused my clogged screen! Same problem even after the rebuild. So what real function is this screen anyway? If I destroy something without the screen (doubtful) I'll fix it. I elected to ditch the screen and take my chances. My power steering problems are now GONE! I went to Harbor Freight and bought both their Nitril o ring set AND I bought their Viton o ring set. The small top solenoid o ring had a match in the Viton set and the big o ring on the solenoid bottom had a match in the Nitril set. I used Mobil One full synthetic grease in putting the solenoid and o rings back in. Be careful with the big o ring at the solenoid bottom. You need to grease it to stay in place up in the rack slot. Put it up into the rack, right at the bottom of the hole, before you screw in the solenoid. Close call: My old o ring was still up in the slot/hole. I found out I was about to put the new o ring on top of the old one! You'll see what I mean when you get into the project. Guaranteed leak, or worse if you forget to pull out the old o ring before you screw in the solenoid. Next issue: The Lexus power steering calls for ATF and NOT power steering fluid. My solution was to use Tractor Fluid from Walmart. This stuff is clear, about the consistency of oil, and I use it in various other hydraulic steering I own, Ford 7.3L truck, etc. Quick lube places will ALWAYS refill your LS400 Lexus PS pump with power steering fluid. Wrong! Tractor fluid worked great for my LS400, and is cheap at Walmart. My guess is ATF would work fine as well. If you still have trouble, use Tractor Fluid. The labor to do this solenoid screen elimination took me about 1 hour max. This ain't rocket science. Oh, another important issue: Ditch that vacuum sender on the bottom/side of your power steering pump. As best I can tell, it does NOTHING but cause trouble. Trace back the vacuum lines and plug them with the little rubber caps you can buy at Autozone. You don't want a vacuum leak. That vacuum sender thing will leak power steering fluid directly onto your alternator. This will destroy your alternator and you will be stuck somewhere. Also, you'll start your LS400 one day and get a cloud of white smoke vacuumed through this ridiculous vacuum sender thing directly into your intake. I actually had a valve job done on this Lexus thinking the white smoke was valve seals ($2000. fix) before I learned about this miserable Lexus PS mistake vacuum sender. Unscrew the vacuum sender and take it down to Autozone. The sender threads match one of the replacement plugs they sell for an engine oil pan. I used Teflon tape on my new Autozone plug and screwed the plug into the power steering pump vacuum sender hole. Problem solved. Good luck. Woody