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There was another thread here, a while back, where we were debating the need for venting of the reservoir (tube) as the fluid is pushed into the caliper.
The question being how that system would allow movement of the fluid level in the tube without letting air in. A regular reservoir has an expandable seal that is drawn down as the fluid level drops, but doesn't allow air into the system.
That system (sealed tubing) doesn't, so a vacuum is created inside the tube as your apply the brake.
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