Front Brake: Inspection

WARNING: This page is about a different car, the 2019 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.

Disc brake piston and cylinder check
1. Check that there is no damage on the side of the disc brake piston and the cylinder wall.
Disc brake pad thickness check
- Normal type
  Limit: 1.5mm {0.059in}
  
  Reference value:: 11.0mm {0.433in} (New)
- Brembo type
  Limit: 1.2mm{0.047in}
  
  Reference value: 8.9mm {0.350in}
Courtesy of SUBARU OF AMERICA, INC.
Front disc thickness check
- Normal type
  Limit: 22.0mm {0.866in}
  
  Reference value:: 24.0mm {0.945in} (New)
- Brembo type
  Limit: 28 mm {1.102 in}
  
  Reference value: 30mm {1.181in}
Courtesy of SUBARU OF AMERICA, INC.

Disc runout check

Before checking the disc runout, check the hub & bearing ASSY play (Refer to ON-VEHICLE INSPECTION ) and runout (Refer to ON-VEHICLE INSPECTION ).
Install the front disc to the axle hub and secure it with 5 hub nuts.
Standard value: T=120N.m {1224kgf.cm} {88.5ft.lbf}

Using a dial gauge, set at 10 mm {0.394 in} inside from the disc outer periphery to check the front side runout.

Normal type
Limit: 0.05mm {0.002in}
Brembo type
Limit: 0.075mm{0.003in}

Courtesy of SUBARU OF AMERICA, INC.

CAUTION:

Do not bring the magnetized part of the dial gauge close to the axle hub or speed sensor.
Install the dial gauge to the shock absorber.
When the runout exceeds the limit, change the disc and axle positions to minimize the runout and install them. If the runout still exceeds the limit even after changing the positions, replace the disc with a new one.

Set the dial gauge at 10 mm {0.394 in} inside from the disc rotor outer periphery, and rotate the disc rotor to check the back side runout.
- Normal type
  Limit: 0.05mm {0.002in}
- Brembo type
  Limit: 0.075mm{0.003in}
  
  NOTE: <Example of magnet stand and dial gauge installation>

Courtesy of SUBARU OF AMERICA, INC.