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If the brake vacuum booster makes vacuum on one side and the other is with normal atmospheric pressure, why doesn't it get sucked by itself towards the vacuum side? If the vacuum isn't enough to pull it, how does the brake piston return back to its place after braking? Isn't this done by vacuum as well? I have watched videos where the brake piston was very hard to push by regular hand so how can vacuum only pull it?

  • As it stands, this question is better suited for engineering.SE – Zaid Sep 3 '15 at 13:35
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    @Zaid - It would need substantial editing to be constructive on Engineering. From my reading, it appears that the OP is more interested in the mechanical aspects as opposed to the engineering theory or principles involved. – user2776 Sep 3 '15 at 14:57
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    @Zaid This could definitely help someone understand the brake system better which will help them in diagnosing repairs. This is good knowledge even if the part isn't "serviceable". I like the premise of this question. – Zach Mierzejewski Sep 3 '15 at 17:02
  • Although it doesn't seem to match common sense, in reality, vacuum does not pull anything. Air is constantly PUSHING on everything, and vacuum just gives the air a direction to push in. – barbecue Sep 5 '15 at 2:12
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There are valves involved that operate when pressure is applied or removed from the brake pedal. Have a look at these simplified diagrams - http://www.agcoauto.com/content/news/p2_articleid/129

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They is designed for the entire life of the vehicle. No maintenance ;except fluid check is commonly ever needed. Avoid disassembly unless you are convinced of failure.

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