E46Fanatics - View Single Post - DIY: Cross Drilled Rotor Brake Install! StepByStep
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Old 11-08-2008, 03:38 PM   #38
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Join Date: Oct 2006
Location: Chicago, IL
Posts: 529
My Ride: 2002 M3C
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Originally Posted by kevmo View Post
wait.. so i have a question about the brake fluid res...

do you loosen it before or while or after ur working on the brakes?... and when u do loosen it and push the calipers in... does it leak from the reservior?

i'll be changing pads this week...

The idea is that when you push the cylinder back in (the round rusty part):

the fluid flows backwards through the system. You only need to take the cap off when you're putting the caliper back on and only if it's too hard to push the cylinder back in (I didn't open mine at all and I've done this multiple times).
The warning of fluid splashing out is only if you squeeze the cylinder back in very quickly, so just do it at a normal slow speed.
It's really self-explanatory once you're doing it.

My Ride: 2002 M3C

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