Porsche 911 GT3 Cup 2018 Techical Manual page 400

7.4.8.3
Information
 Remove brake piston, spring and guide pin (Fig. 7.4.8.3)
7.4.8.4
Information
 Remove the main seal and piston ring in the specified sequence (Fig.
7.4.8.4)
7.4.8.5
 Remove the secondary seal as specified (Fig. 7.4.8.5)
Version: 4/20/2018
Components must not be interchanged with parts
from other brake master cylinders.
Perform all work on the seals using new gloves.
Maintenance
911 GT3 Cup (991 II)
MY 2018
399