No didn't fine any leak after pumping the pedal. No bubbles as well. All I did was added fluid to the max had someone pump the pedal an when there was pressure you can see the fluid level go down, an when there is a loss of pressure you see the level rise up to max again. Even putting the cap on when there is pressure, every time there is a lost of pressure the cap would come off. An there is no way screwing on the cap because its just a clip on. I hope I can describe clearly as possible.

1989 Dodge Raider V6 5speed Red/Gray
1978 Mercedes 300D Diesel
1978 Mercedes 240D Diesel