I had to re-use 1of the 2of my existing inner copper washers between the caliper and the hose. The 2 new copper washers that come with the hose are half the thickness of original [ 1/2 thickness of a penny]. Brake fluid leaked between caliper and hose. The outer washer between the head of the bolt and the brake hose fitting was ok to use the new thinner copper washer, no leak. Brake hose good product though!