Front Brake Pad, Brake Caliper & Brake Rotor: Inspection

WARNING: This page is about a different car, the 2007 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

CHECK BRAKE CYLINDER AND PISTON
1. Check the cylinder bore and piston for rust or scoring.
  If necessary, replace the cylinder and piston.
CHECK PAD LINING THICKNESS
1. Using a ruler, measure the pad lining thickness.
  Standard thickness: 12.0 mm (0.472 in.)
  
  Minimum thickness: 1.0 mm (0.039 in.)
  
  If the pad lining thickness is equal to or less than the minimum, replace the pad.
  
  Fig 1: Measuring Pad Lining Thickness
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK FRONT DISC BRAKE PAD SUPPORT PLATE
1. Check the 4 plates as follows. If necessary, replace the plates.
  1. Use brake cleaner to clean the pad support plate's pad and cylinder mounting contact surface. Inspect for deformation, cracks, rust and foreign matter that is difficult to remove.
  2. Use brake cleaner to clean the cylinder mounting's pad support plate contact surface. After installing the pad support plate to the cylinder mounting, inspect for looseness and deformation.
  3. After installing the pad, inspect if the pad falls off easily (due to the spring force of the pad support plate).

CHECK DISC THICKNESS

Using a micrometer, measure the disc thickness.

Fig 2: Checking Disc Thickness

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard thickness

MODEL SPECIFIED CONDITION (STANDARD THICKNESS)

Model	Specified Condition
With 275 diameter disc	25.0 mm (0.984 in.)
With 296 diameter disc	28.0 mm (1.102 in.)

Minimum thickness

MODEL SPECIFIED CONDITION (MINIMUM THICKNESS)

Model	Specified Condition
With 275 diameter disc	22.0 mm (0.866 in.)
With 296 diameter disc	25.0 mm (0.984 in.)

If the disc thickness is less than the minimum, replace the disc.

CHECK DISC RUNOUT
1. Check the axle hub bearing (see ON-VEHICLE INSPECTION ).
2. Tighten the disc with the 3 hub nuts.
3. Using a dial indicator, measure the disc runout 10.0 mm (0.39 in.) from the outer edge of the disc.
  Maximum disc runout: 0.05 mm (0.0020 in.)
  
  Fig 3: Measuring Disc Runout
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the runout is greater than the maximum, change the installation positions of the disc and axle so that the runout will become minimal. If the runout is greater than the maximum even when the installation positions are changed, grind the disc. If the disc thickness is less than the minimum, replace the disc.
4. Remove the 3 hub nuts.