RE: Emergency Brake Adjustment
The cable system is self adjusting. The self adjusting mechinism is underside of truck above driveshaft and they do get dirty. but generally are maintaince free.
The parking brake shoes do have an adjustment screw which is accessible through a lug bolt hole, and can be adjusted to take up some slack, but be warned of over adjusting! Too tight and you can create a great deal of heat! (It's not pretty). If I remember right, the offical procedure is: adjusted until tight, then backed off five clicks. Equal adjustments per side! (I think that put the pedal too low and have always gone about three clicks per side when adjusting).