Bike bias valve.

[HBG]

Hi all.

I seem to have a weep from the rear brake bias valve. It's only a little so far and may be coming from the large brass end and what appears to be a copper washer under it. The brass part has two holes in it, possibly for use as a means of tightening it.

Is this common, should I just try and tighten it? How tight? Standard thread?

I'll monitor it for a few days before meddling.

Thanks

[lancialulu]

These are more or less readily available....

[nistri]

Fitted to Fiat Panda in the 80'.