Rear Brake Pad, Brake Caliper & Brake Rotor: Inspection

INSPECT BRAKE CYLINDER AND PISTON
1. Inspect the cylinder bore and the piston for rust or scoring.
  If necessary, replace the brake cylinder assembly rear and piston.
INSPECT REAR 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.
  
  Fig 1: Measuring Disc Thickness
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.)
INSPECT DISC RUNOUT
1. Temporarily fasten 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.) away from the outer edge of the rear disc
  Maximum disc runout:
  
  0.05 mm (0.0020 in.)
  
  Fig 2: Measuring Disc Runout
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. 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 REAR AXLE HUB ). 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
4. Remove the rear disc.