Rear Brake Pad, Brake Caliper & Brake Rotor: Inspection

INSPECT BRAKE CYLINDER AND PISTON
1. Inspect the cylinder bore and the brake piston for rust or scoring.
INSPECT PAD LINING THICKNESS
1. Using a ruler, measure the pad lining thickness.
  Minimum thickness: 1.0 mm (0.039 in.)
  
  Standard thickness: 10.0 mm (0.394 in.)
Fig 1: Measuring Pad Lining Thickness Using Ruler
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT REAR DISC BRAKE PAD SUPPORT PLATE NO. 1
1. Inspect the front disc brake pad support plate (No. 1) and the front disc brake pad support plate (No. 2).
  HINT:
  
  Make sure that they have sufficient rebound, and have no deformation, cracks or wear, and all rust and dirt are cleaned off.
INSPECT REAR DISC BRAKE PAD SUPPORT PLATE NO. 2
HINT:

Inspect the rear disc brake pad support plate No. 2 using the same procedure with the rear disc brake pad support plate No. 1.
INSPECT DISC THICKNESS
1. Using a micrometer, measure the disc thickness.
  Minimum thickness: 8.5 mm (0.335 in.)
  
  Standard thickness: 10.0 mm (0.394 in.)
2. If the disc thickness is less than the minimum, replace the front disc.
  
  Fig 2: Measuring Disc Thickness Using Micrometer
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002