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Message: <blockquote data-quote="stutaeng" data-source="post: 22136" data-attributes="member: 6175">My beater 2000 OBS K3500 had/has a leaky mess. The PS would leak about 1 qt. in about 60 miles when I had just got it, LOL. Mines were the lines. I had my son turn the steering wheel and there was this massive leak! I can't remember if I replaced the hydroboost unit on that one; I think I did?. But I replaced all the leaky PS/hydroboost lines and they come with the little o-rings. The instructions on the new lines do say to replace all lines because they degrade from the inside out. Makes sense, I guess.I had had a leaky PS line on my 99 Silverado as well, but wasn't as bad. That one has the vacuum assist brakes with rack and pinion, but same thing applies.I would take the opportunity to go a head and replace the PS fluid and do a full bleed. Likely the fluid is past it's service life. Get new, fresh fluid into the system.OP mentioned an 8.1, so that would be a 2001+ 2500HD with torsion bar/gearbox steering (even the 2wd version) and hydroboost brake system...</blockquote>