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Message: <blockquote data-quote="ORVietVet" data-source="post: 22104" data-attributes="member: 9438">To [USER=12127]@mayvillain[/USER], I would bet that your hydro-boost is leaking at the accumulator and since I am also betting that it is seeping/leaking inside the cab, under the dash where the rod that attaches at the brake pedal, comes out of the back of the hydro-boost. Very common. I know. Mine is and I will be replacing the hydro-boost. You can leave the brake lines attached to the master cylinder and remove the two 15mm nuts and pull it away and look to verify that there is no leak at the back of the master cylinder. The hydro-boost is not that hard to replace. About 1 hour and will need a refill of p/s fluid to top off and bleed system. Check this video out from South Main Auto LLC from you tube. Pay close attention to what he says about the lines and o-rings at the booster. If you do the booster, it is the perfect time to do the stop light switch replacement too. This guy does great videos: [MEDIA=youtube]Hqb_i1nBzfk[/MEDIA]If you do decide to replace the lines, the one on the engine side of the hydro-boost that goes to the back of the p/s pump, is a booger. Check some videos out for that too. There is another video on you tube for bleeding the system out if you do lines and dump the system. [MEDIA=youtube]ji5NtlG3Bag[/MEDIA]This bleeding video is how I was taught by a wise old man at Kaiser Brake & Alignment in Eugene, Oregon.</blockquote>