I've recently "fixed" two Roca toilets in my daughter's flat which both continued to trickle after flushing. I found that when the casing holding the buttons was tightened the dribble increased. My conclusion was that the column containing the flushing mechanism was not plumb below the hole in the lid. When the plastic screw was tightened it pulled the column slightly out of line - just enought to break the seal in the flushing mechanism and thus causing the trickle. I slackened off the screw until the trickle stopped. I then put buttons back on. Of course, the casing holding the buttons moved about a little - this was solved by putting a little clear glue under the circular top of the button unit. Once the glue set this was trimmed. The problem was solved without having to buy any new washers, etc. Worth a try.
Robin
October 2008
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