Here is some info that should help you.The key to this is the special brake spring too which you can probably get at your local parts supplier.
Brake Shoe Replacement
Brake Shoe Spanner and Spring Remover
Notice: Do not over stretch the adjuster spring. Damage can occur if the spring is over stretched.
Specification Brake Shoe Lining Minimum Thickness: 0.5 mm (0.020 in).
Ok,here is the information you requested.It is inside the console.
Parking Brake Adjustment (Drum Brake)
Important: The park brake cable adjusting nut is a nylon lock type. Use ONLY HAND TOOLS whenever tightening or loosening the adjusting nut.