Front Brake Caliper: Inspection

MEASURE PAD LINING THICKNESS
Using a ruler, measure the pad lining thickness.

Standard thickness: 11.0 mm (0.433 in.)

Minimum thickness: 1.0 mm (0.039 in.)

Replace the pad if the thickness is less than the minimum (the 1.0 mm slit is no longer visible), or if it shows signs of uneven wear.

Fig 1: Measuring Pad Lining Thickness
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
MEASURE DISC THICKNESS
Using a micrometer, measure the disc thickness.

Standard thickness: 32.0 mm (1.260 in.)

Minimum thickness: 30.0 mm (1.181 in.)

Replace the disc if the thickness of the disc is at the minimum thickness or less. Replace the disc or grind it on a lathe if it is scored or is worn unevenly.

Fig 2: Measuring Front Brake Disc Thickness
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
MEASURE DISC RUNOUT
1. Temporarily fasten the disc with the 3 hub nuts.
2. Using a dial indicator, measure the disc runout at a position mm (0.39 in.) away from the out side edge.
  Maximum disc runout: 0.05 mm (0.0020 in.)
  
  Fig 3: Measuring Front Brake Disc Run Out
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the disc's runout is maximum value or greater, check the bearing play in the axial direction and check the axle hub runout (See FRONT AXLE HUB ). If the bearing play and axle hub runout are not abnormal, adjust the disc runout or grind it on a "On-Car" brake lathe.
IF NECESSARY, ADJUST DISC RUNOUT
1. Remove the 2 bolts and torque plate.
2. Remove the 3 hub nuts and disc. Turn the disc 1/5 turn and reinstall the disc. Install and torque the 3 hub nuts.
  Torque: 103 N.m (1,050 kgf.cm, 76 ft.lbf)
3. Remeasure the disc runout. Make a note of the runout and the disc's position on the hub.
4. Repeat (b) until the disc has been installed on the 3 remaining hub positions.
5. If the minimum runout recorded in (b) and (c) is less than 0.05 mm (0.0020 in.), install the disc in that position.
6. If the minimum runout recorded in (b) and (c) is greater than 0.05 mm (0.0020 in.), replace the disc and repeat step 3.
7. Install the torque plate and torque the 2 bolts.
  Torque: 118 N.m (1,200 kgf.cm, 87 ft.lbf)