Review on Master Cylinder by Michael Morgan

I agree with the other review that the o-ring is the wrong size. It's too big so it bulges and leaks. You will lose fluid, possibly get air in the brake lines and probably lose braking function! I think you need a #29 ring to fit properly. Check and check the seal yourself. Luckily this happened on the project car which is still on jacks so I saw the leak the next day. Not a very expensive ring at your local hardware store, but you'd think a company that processes critical components like brake parts wouldn't make that mistake. They even have a flyer in the box saying the importance of installing brake parts correctly and they give you the wrong part!