I am rebuilding the front brake master cylinder. This is a machine that my hunting club bought for $500. It had been sitting and not running for several years. After about $260 in parts, including and battery, it runs great.
In the bottom of the reservoir there is a round rubber seal with a small "X" cut into it. It covers the two holes where the brake fluid goes in and out. The holes are small but one is considerably larger than the other. One is about 1 millimeter and the other is probably 3 millimeters in diameter.
The rebuild kit did not contain a new seal to cover the ports. Automotive master cylinders do not have this rubber seal. I am wondering if it is even needed. Can anyone give me input?
I attached a picture. One is without the rubber seal installed and the other it is installed.
