Neugy5@alien.topB to Mechanic Advice@gearhead.townEnglish · 10 months ago

I’m installing new break lines and a master cylinder and as I’m adding break fluid this black substance comes up into my master cylinder. Anyone know what it is and should it be of concern?

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bcredeur97@alien.topB
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10 months ago
It’s rubber from the brake lines. Happens on every brake system :/

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What is this black substance in my master cylinder as I bleed my breaks

What is this black substance in my master cylinder as I bleed my breaks