Front Brake Caliper: Inspection

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 pad's thickness is at the minimum thickness or less, or if the pad has severe and uneven wear.

Fig 1: Measuring Pad Lining Thickness Using Ruler

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a micrometer, measure the disc thickness.

Standard thickness: 18.0 mm (0.709 in.) 

Minimum thickness: 16.0 mm (0.630 in.) 

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

Fig 2: Measuring Disc Thickness Using Micrometer

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a dial indicator, measure disc runout 10 mm (0.39 in.) away from the outer edge of the disc.

Maximum disc runout: 0.05 mm (0.0020 in.) 

If the disc's runout is the maximum value or greater, check the bearing play is in the axial direction and check the axle hub runout (See REMOVAL ). If the bearing play and axle hub runout are not abnormal, adjust the disc runout or grind it on a "On-car" brake late.

Fig 3: Measuring Disc Runout Using Dial Indicator

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the 2 mounting bolts and torque plate from the knuckle.
2. Remove the hub nuts and the disc. Reinstall the disc in the position turned 1/4 from its original position on the hub. Install and torque the hub nuts.

   Torque: 88 N.m (900 kgf.cm, 65 ft.lbf) 

3. Remeasure the disc runout. Make a note of the runout and the disc's position on the hub.
   Fig 4: Adjusting Disc Runout

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Repeat  (b) until the disc has been installed on the 2 remaining hub positions.

   If the minimum runout recorded in (b) and (c) is less than 0.05 mm (0.0020 in.), install the disc in that position.

   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.

4. Install the torque plate and 2 mounting bolts.

   Torque: 88 N.m (900 kgf.cm, 65 ft.lbf)