I have an 82 245, so I don't know if the calipers are mounted the same way as yours. However if you have solid brake line from the caliper up to a union with the flexible line mounted on the strut, then yours are similar.

I would look at the condition of the flexible brake lines; if they are shabby then this would be a good time to replace them and repack the bearings and flush the brake system. Remove the caliper with the metal lines attached, repack the bearing and replace the grease seals and then put the new flexible line in service and reinstall the caliper by making up the connection at the flexible line. The last thing you want to do is break the connection between the metal brake line and the caliper; they can be a bear to reconnect. The advice in the other messages about being very careful on the bearing repack is right on point. Cleanliness is next to Godliness here. Use mineral spirits to wash, in a three bin wash. Let air dry and repack. Flushing the brake lines every second or third year rreally extends the life of the calipers.

Dean