Mystery brake leak at new MC

Referring to the original post. It is a dual m/c & the poster specifically refers to a bolt, bottom-middle. That is the piston stop for the rear piston & should have a copper washer for sealing because it is a parallel thread, not a tapered thread. The bolt may not be included in o'haul kits because it is a non wearing item. Bolt is not needed on single m/c.