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Just wanted to post this for archival, anecdotal knowledge. The Motive Products folks wisely include a step in the instructions for their Power Bleeder product that recommends you hook it up empty and press it to 10 psig and check for leaks. I recall the reviewer in european car tried the Power Bleeder on a 911 and omitted this step with nasty results.
I just finished the front pad replacement on my 1980 MB 300D. I figured I would flush the brake system out at the end. Luckily, I remembered the ec article and read the instructions. MB master cylinders have two small rubber pushbutton grommets on the top for checking the brake warning light circuits. On old beaters (like mine) these can dry out and crack. I had a little bubble action coming out of the rear button, which would have been Mt. Vesuvius if I had fluid in the bleeder and cranked up to 15 psig like I normally do.
So remember to read the directions and that rubber brake parts aren't forever. I still think the Motive Products is an excellent product, you just have to watch what you're doing carefully.
someguyfromMaryland
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