Rear Brake Shoe, Wheel Cylinder & Brake Drum: Inspection

INSPECT BRAKE CYLINDER AND PISTON
1. Check the cylinder bore and piston for rust and scoring. If necessary, replace the brake cylinder assembly or piston.
INSPECT BRAKE DRUM INSIDE DIAMETER
1. Using a brake drum gauge or an equivalent tool, measure the inside diameter of the drum.
  Standard inside diameter:
  
  228.6 mm (9.00 in.)
  
  Maximum inside diameter:
  
  229.6 mm (9.04 in.)
  
  If the inside diameter is more than the maximum, replace the drum.
  
  Fig 1: Measuring Inside Diameter Of Drum
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT REAR BRAKE SHOE LINING THICKNESS
1. Using a ruler, measure the thickness of the shoe lining.
  Standard thickness:
  
  5.0 mm (0.197 in.)
  
  Minimum thickness:
  
  1.0 mm (0.0394 in.)
  
  Fig 2: Measuring Thickness Of Shoe Lining
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the lining thickness is less than the minimum, or if there is severe or uneven wear, replace the brake shoe.
  
  NOTE: Always replace both the right and left drum brake shoes together.
INSPECT BRAKE DRUM AND DRUM BRAKE SHOE LINING FOR PROPER CONTACT
1. Apply chalk to the inside surface of the drum, then grind down the brake shoe lining to fit the drum. If the contact between the drum and the brake shoe lining is improper, repair it using a brake shoe grinder or replace the brake shoe.
  
  Fig 3: Checking Contact Between Drum And Brake Shoe Lining
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002