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Message: <blockquote data-quote="mayvillain" data-source="post: 22093" data-attributes="member: 12127">First post; I just graduated from the GMT400 forum when I bought a 2002 Silverado 2500HD. It has the 8.1L/Allison trans combo. I bought it with a significant "power steering leak." The previous owner was letting it leak and topping off the fluid occasionally. There is a LOT of fluid in the engine compartment/undercarriage. I eventually tracked down the source and I'm 99% sure it's coming from the brake booster. I was just about to replace it, but a guy at the bar mentioned it could just be o-rings from the connecting lines. I figured I would try that first since the parts are $300+ and it's fairly easy to remove/install. Does anyone know the o-ring sizes I would need to get? Or any advice in general with this issue.</blockquote>