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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Suspension | Chassis | Brakes > Strange Brake Bubbles
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      02-05-2018, 08:17 PM   #1
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Drives: F30 335i, E46 325iT
Join Date: Mar 2009
Location: San Diego, CA

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Strange Brake Bubbles

So, I'm bleeding my brakes after replacing the rotors and pads, and notice some strange looking bubbles coming out of the outboard side of the front-right caliper. Upon a closer look, I notice that the bubbles aren't rising and are dark in color. I then realize that the bubbles are actually small particles of something. Rust? Dirt? I don't know. Has anyone else run into this?

My M-Sport 335i is only 4 years old with abut 42k miles. It received BMW maintenance from it's former owner, so I assume that the brakes were flushed 2 years ago. I did notice that the old brake fluid had a green tint. I used to use ATE Blue, so I didn't think much of it. The brakes felt fine before, though they are much firmer now. I sure hope my brakes aren't rusting.
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