Brake lights staying on

Just replaced the M/C and rebuilt booster (from Booster Dewey) and now brake light remain on until I pull the pedal back. The pushrod was set with .0020 clearance.
Not sure why the pedal won't return normally, any thoughts?

These things are not aircraft, and we are all dealing with Chineseoationized parts. There could easily be a small difference in the mc piston depth and it would not take much. The days of Raybestos, Wagner, Bendix "old school" parts manufacturers are long past.