Parking Brake Assembly: Inspection

INSPECT BRAKE DISC INSIDE DIAMETER
1. Using a brake drum gauge or equivalent tool, measure the inside diameter of the rear disc.
  Standard inside diameter:
  
  170 mm (6.69 in.)
  
  Maximum inside diameter:
  
  171 mm (6.73 in.)
  
  If the inside diameter exceeds the maximum, replace the brake disc.
  
  Fig 1: Measuring Inside Diameter Of Rear Disc Using Brake Drum Gauge
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT PARKING BRAKE SHOE LINING THICKNESS
1. Using a ruler, measure the thickness of the shoe lining.
  Standard thickness:
  
  2.0 mm (0.079 in.)
  
  Minimum thickness:
  
  1.0 mm (0.039 in.)
  
  If the lining thickness is less than the minimum, or if there is severe or uneven wear, replace the brake shoe.
  
  NOTE: Replace both the right and left parking brake shoes as a set.
  
  Fig 2: Measuring Thickness Of Shoe Lining Using Ruler
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT BRAKE DISC AND PARKING BRAKE SHOE LINING FOR PROPER CONTACT
1. Apply chalk to the inside surface of the disc, then grind down the brake shoe lining to fit the disc. If the contact between the disc and the brake shoe lining is improper, repair it using a brake shoe grinder or replace the brake shoe.
  
  Fig 3: Inspecting Brake Disc And Parking Brake Shoe Lining
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002