for one replace all your rubber brake hoses...all of them. I don't think I've seen much feedback on the disk brake "parking brake setup"....from actual endusers.
I do think its quite common to have issues with the rear drum setup in regard to the brakes staying ajusted and the parking brake working properly.
I do think its quite common to have issues with the rear drum setup in regard to the brakes staying ajusted and the parking brake working properly.