I never had that issue with my rear Z brakes..... Could be the ebrake line hitting the driveshaft. Since you did install the risers, I would only assume that line were brought a tab lower, low enough to hit the driveshaft. Since you say when you pull the ebrake noise goes away, you probably remove the slack the ebrake line has and lifts it off the driveshaft... check that out dude.
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