Rear Brake Pad, Brake Caliper & Brake Rotor: Inspection

INSPECT BRAKE CYLINDER AND PISTON
1. Inspect the cylinder bore and piston for rust or scoring.
  If necessary, replace the rear disc brake cylinder assembly.
Fig 1: Identifying Matchmarks On Rear Disc And Axle Hub
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT DISC THICKNESS
1. Using a micrometer, measure the disc thickness.
  Standard thickness:
  
  18.0 mm (0.709 in.)
  
  Minimum thickness:
  
  16.5 mm (0.650 in.)
  
  If the disc thickness is less than the minimum, replace the rear disc.
INSPECT PAD LINING THICKNESS
1. Using a ruler, measure the pad lining thickness.
  Standard thickness:
  
  10.5 mm (0.413 in.)
  
  Minimum thickness:
  
  1.0 mm (0.039 in.)
  
  If the pad lining thickness is less than the minimum, replace the pad.
  
  HINT:
  
  Be sure to check the wear of the rear disc after replacing the brake pad with a new one.
Fig 2: Measuring Pad Lining Thickness
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT DISC RUNOUT
1. Install the rear disc with the hub nuts.
  Torque: 103 N*m (1,050 kgf*cm, 76 ft.*lbf)
2. Using a dial indicator, measure the disc runout 10 mm (0.39 in.) from the outer edge of the rear disc.
  Maximum disc runout:
  
  0.05 mm (0.0020 in.)
  
  If the runout exceeds the maximum value, change the installation positions of the disc and axle so that the runout will become minimal. If the runout exceeds the maximum even when the installation positions are changed, check the bearing play in the axial direction and the axle hub runout (see ON-VEHICLE INSPECTION ). If the bearing play and the axle hub runout are normal and if the disc thickness is not within the specified range, shave the disc. If the disc thickness is less than the minimum, replace the disc.
3. Remove the rear disc.
Fig 3: Measuring Disc Runout
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002