You need to make the union on the caliper earth out, you could try a centre punch on the edge of the copper washer and caliper to see if the works.
we have bled the brakes.
I don’t think the brake pipe at the caliper end is earthing out, have you bled the brakes yet.
Thanks for this. We have checked the brake line and it is definitely earthed. If we run a cable from the earth lead on the repeater directly to the brake hose the indicator it works. However the caliper & upright do not seem to “transfer” the earth to the wing stay.