I know I should put this in the construction equipment category but there seems to be more Case guys that look here and I'm sure case tractors have a diff lock also. Anyway, I have a case 580B ( 1979) Backhoe and the diff lock is stuck. I have been having problems with the right brake sticking but I usually just put the shuttle in reverse and it frees itself. But today When this happened I noticed a good bit of coal black brake dust in the snow and then noticed the diff lock was stuck. Also, now it seems that the right brake is either barely working or not working at all. ( hard to tell in the snow) I check under the hoe and the linkage looks fine. needless to say, steering is now tricky at best. Any Idea what is wrong??? I have 18"+ of new snow and a 2.5 mile driveway !! So, I obviously need to find the problem fairly quickly. BTW...ever notice things always break when you REALLY need to use them??