Use Cbs143

On the rear brakes of the Morris Minor the brake line is connected to the cylinder by way of this hollow bolt. It is hollow to allow for the passage of brake fluid but this also means that it is easy to overtorque. You have to have it tight enough not to leak brake fluid but not so tight as to break or strip the threads. We seem to sell a lot of these as replacements!
The copper washers that seal this bolt are 3H550 and 233220.