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Old 02-12-2009, 06:14 PM
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white smoke in exhaust

I have a 35 Ford with Buick 3.8 v6 and 200R4 transmission. I rebuilt the engine and have Midland power brake booster. When I hit the brakes really hard as in a panic stop, clouds of white smoke come out the exhaust. I mean enough to blanket an intersection. Car runs good other than that. Any ideas?

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Old 02-12-2009, 08:25 PM
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I would venture from that description that you have a ruptured power booster diaghram, or a master cylinder leaking into the booster. Not sure how that booster is operated or whether it's a single or dual daigram, but it sounds like you are sucking brake fluid into the engine on high vacuum conditions like braking. When you hit the brakes the pressure pushed fluid by the seal into the booster and sucked into the engine. It can also be caused by a ruptured diaghram letting vacuum into the rear of the master and causing the same to happen. If that's the case, the master cylinder should be loosing fluid in the rear reservoir, with no indication of a leak anywhere.. You can also disconnect the vacuum line and see if it occurs without it, the brakes will take more effort but you will be able to eliminate or pinpoint that as a problem.
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