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Discussion Starter #1
I found an extra part inside my master cylinder... it's a wafer-thin washer between the piston and the spring cup. My rebuild kit didn't come with a replacement and it's not mentioned in the shop manual.
What is it and should I reuse it? Any help, thanks.
 

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Discussion Starter #2
I figured it out.
The new spring cup has an inset brass ring where the "mystery" washer would be. It's to keep the rubber cup from getting sucked into the piston ports.
I am an idiot
 

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Discussion Starter #4
Thanks. It's been a long winter, my automotive brain has been on hiatus for too long.
 
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