Neugy5B to Mechanic Advice@gearhead.townEnglish · 1 year ago

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

Neugy5B to Mechanic Advice@gearhead.townEnglish · 1 year 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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bcredeur97B
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1 year ago
It’s rubber from the brake lines. Happens on every brake system :/

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