I bought a second hand set of Hope M4's recently and which have come with a set of goodrich hoses on them. When fitting them to the bike, I undid the front banjo to adjust the line of the front hose. Unfortunately, i've split the rubber o-ring seal, and now the seal is gone totally.
Its got me wondering though. Should it really only have an o-ring seal? With the current setup, I have:
Caliper : Banjo : Rubber O-ring : Bolt
Should it not have a copper washer seal on each side of the banjo?
Caliper : Copper Washer : Banjo : Copper Washer: Bolt
A browse on the web seems to show a couple of different setups .
This has 2 washers:

Where these have 1:

What do you lot have?

