[Leecbr]

I have an unusual problem with a leak around the cap on my master cylinder. I removed it to add fluid, and now it wants to seep whenever I ride it. It does not leak when sitting. It only leaks when I take it out for a drive. It is only a small amount. I I checket the rubber seal under the cap.It looks good but it still leaks the same. Any ideas as to what would cause this? The fluid level is right, and it did not leak before.The fluid level is 1/4 empty from the top, leaving room for expansion etc.

Has this happened to anyone else.