Hello Folks! I'm new here. I have a 6300 that the right brake has stopped working. The pedal goes to the floor, no brake. The left brake still works fine. I have the Test & Diagnose and the Repair CD's from JD and followed the instructions to bleed the brake system, but still no help. I would like to disconnect the line coming out of the brake cylinder and plug off the outlet so I can determine if the problem is in the brake cylinder or in the brakes on the rear axle, but I can't find a fitting to cap off where the brake line is disconnected. Can someone tell me what size cap it requires? I am sure it is metric. Am trying to avoid ordering the control valve tool kit from JD but may have to. Thanks