Disc Brake Pad and Disc: Inspection

1. Jack-up the vehicle and support with rigid racks. Then remove the wheels.
2. Visually check the pad thickness through inspection hole of disc brake assembly. Replace the pad if necessary.
   NOTE: When replacing a pad, always replace the pads for both the left and right wheels at the same time. Also replace the pad clips if they are twisted or worn.
   Fig 1: Identifying Inspection Hole

   Courtesy of SUBARU OF AMERICA, INC.
   • Front

     Pad thickness	mm (in)
     Standard value	11 (0.43)
     Wear limit	1.5 (0.059)

   • Rear

   Pad thickness	mm (in)
   Standard value	11 (0.43)
   Wear limit	1.5 (0.059)

   Fig 2: Identifying Pad Thickness, Back Metal And Lining

   Courtesy of SUBARU OF AMERICA, INC.
3. Check the disc rotor, and correct or replace if it is damaged or worn.
   • Front

     Disc rotor thickness	mm (in)
     Standard value	30 (1.18)
     Wear limit	28 (1.10)

   • Rear

   Disc rotor thickness	mm (in)
   Standard value	18 (0.71)
   Wear limit	16 (0.63)

4. Remove the caliper body. Refer to FRONT DISC BRAKE ASSEMBLY Front Disc Brake Assembly. Refer to REAR DISC BRAKE ASSEMBLY Rear Disc Brake Assembly.
5. Tighten the wheel nuts to secure disc rotor.
6. Set a dial gauge at a point of 10 mm (0.39 in) or less from outer periphery of the rotor, and then measure the disc rotor runout.

Disc rotor runout limit: 

Front: 0.05 mm (0.002 in) 

Rear: 0.05 mm (0.002 in) 

Fig 3: Measuring Disc Rotor Runout

Courtesy of SUBARU OF AMERICA, INC.