Well, I rebuilt the rear brakes (shoes, turned drums, honed/rebuilt cylinders, new springs, etc.) and I replaced the two rear parking brake cables that had rusted so solid that neither Mopar rust penetrant nor PB Blaster would touch 'em. So now I have 4 working brakes (a first for this jeep) and a working parking brake, except for one little thing. When the brake is engaged, it holds for a few seconds, and then releases. Is there any adjustment or modification that I can do to the foot-control mechanism? The rest of the system is adjusted perfectly. It is just that the foot control mechanism won't hold tension. If it is trashed, is there a cheap way to replace/rebuild it?