Rear Brake Shoe, Wheel Cylinder & Brake Drum: Inspection

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT REAR BRAKE DRUM INSIDE DIAMETER
1. Using a brake drum gauge or the equivalent, measure the inside diameter of the brake drum.
  Standard inside diameter:
  
  200 mm (7.874 in.)
  
  Maximum inside diameter:
  
  201 mm (7.913 in.)
  
  If the inside diameter is greater than the maximum, replace the brake drum.
  
  Fig 1: Measuring Inside Diameter Of Brake 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:
  
  4.0 mm (0.157 in.)
  
  Minimum thickness:
  
  1.0 mm (0.039 in.)
  
  If the lining thickness is equal to or less than the minimum value, or if there is any severe or uneven wear, replace the brake shoe.
  
  Fig 2: Measuring Thickness Of Shoe Lining Using Ruler
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NOTE: If the brake shoes need replacing, they must be replaced as a set.
INSPECT REAR BRAKE DRUM AND REAR BRAKE SHOE LINING FOR PROPER CONTACT
1. Apply chalk to the inside surface of the drum, then grind the brake shoe lining so that they fit together properly.
  If the contact between the drum and the shoe lining is improper, repair it using a brake shoe grinder or replace the brake shoe assembly.
INSPECT WHEEL BRAKE CYLINDER
Check the cylinder bore and piston for rust and scoring.

Fig 3: Applying Chalk To Inside Surface Of Drum
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002