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Rear brake question

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Here is a question; hopefully not a dumb one. When you fill the Master Cyll with fluid after bleeding, how do you prevent air from getting trapped between the rubber dampner and the fluid below it before putting the top back on??

Also, after you put the rubber dampner in do you pour fluid into the seal itelf before putting the top back on??

I've got a spongy rear brake that I've bought replacement parts for and just want to make sure I'm doing everything correctly on the re-install.

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Just fill the fluid to the fill line on the inside of the cylinder. Some people fill it a little above and then put the rubber plunger in, just to remove any trapped air to insure it doesn't migrate or cause the cylinder to get hot. You don't put fluid into the plunger itself. Just fill the cylinder, stick it in, and tighten the screws.

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