Front Brake Caliper: Inspection

Fig 1: Measuring Pad Lining Thickness

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a ruler, measure the pad lining thickness.

1. Standard thickness: 11.5 mm (0.453 in.) 
2. 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 2: Measuring Disc Thickness

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a micrometer, measure the disc thickness.

1. Standard thickness: 22.0 mm (0.866 in.) 
2. Minimum thickness: 20.0 mm (0.787 in.) 

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

Fig 3: Measuring Disc Runout

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a dial indicator, measure the disc runout at a position 10 mm (0.39 in.) from the outside edge.

1. Maximum disc runout: 0.07 mm (0.0028 in.) 

If the runout is greater than the maximum, replace the disc or grind it on a "On-Car" brake lathe.

1. Remove the hub nuts and disc. Reinstall the disc 1/6 of a turn round from its original position on the hub. Install and torque the hub nuts.
   1. Torque: 103 N.m (1050 kgf.cm, 76 ft.lbf) 
2. Remeasure the disc runout. Make a note of the runout and the disc's position on the hub.
3. Repeat (a) and (b) until the disc has been installed on the 4 remaining hub position.
   • If the minimum runout recorded in (a) to (c) is less than the maximum disc runout, install the disc in that position.
   • If the minimum runout recorded in (a) to (c) is greater than the maximum disc runout, replace the disc and repeat step 3.