Works exactly as described. First of all if you say it's putting air in the brake line, take your car to a mechanic because if you can't use such a simple tool and can't figure out why air bubbles are forming, then you shouldn't be messing with the car at all . . Let's see how it works, it creates a vacuum and not an overpressure. So what does it mean, the air bubbles you're seeing are coming from the threads on the exhaust valve? Try not to loosen the breather too much, you just need to loosen it a little. Second, since air bubbles are coming out of the threads on the exhaust valve and the system is under vacuum, no bubbles will enter the brake system when bleeding. I'm a mechanic, I've been a mechanic my whole life, that's all I've ever been. Like I said, if you can't use a simple tool, don't mess with your machine. It's scary reading some of the reviews on here from people who shouldn't be touching their cars, they're driving, I have air in my brakes lol. In any case, flushing the entire brake system with this tool should not take more than 30 minutes.
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