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Continue to ChatA silver cap sits on top of the reservois, the TRP HY/RD uses mineral oil https://cycletechreview.com/2015/cyclocross/trp-hyrd-brakes/attachment/vi1e0467/
A silver cap sits on top of the reservois, the TRP HY/RD uses mineral oil https://cycletechreview.com/2015/cyclocross/trp-hyrd-brakes/attachment/vi1e0467/