I'm 90% certain there's air trapped in there. Sometimes you get tiny bubbles stuck to the inside of the caliper. I saw others recommend hitting the caliper with a dead-blow hammer, which is sold advice.
I'm also vehemently against Motive bleeders. Those things cause too many problems with letting air in. I do it the old fashioned way.
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Now: 2017 Corvette Grand Sport, 2021 AMG C63 S sedan
Past: 2011.5 M3 sedan ZCP
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