Version: 16.12.2014 - Porsche 2015 911 GT3 Cup Technical Manual

Chassis
3.7.1.2
3.7.1.3
911 GT3 Cup (991)
160
Brake disk wear limit
The wear limit is reached when the disk has been worn down to the bottom of the
slot (figure 3.7.1.2). The disk should also be replaced if there are cracks up to the
edge of the disk that are caused by increased thermal stress.
Brake pad wear limit
The wear limit is reached when the disk has been worn down to the bottom of the
slot. In addition, the pads should also be replaced if excessive diagonal wear is
detected. In this case, the brake pistons of the caliper have to be checked
immediately to find out the cause.
Repair instructions
A repair kit with seals and pistons is available, as well as a repair kit containing only
seals. Pistons have to be replaced only if they are mechanically damaged. The
service life of the seals is 60 hours before they have to be replaced. Under extreme
temperature load, they may have to be replaced even earlier. This is indicated by
sluggishly moving wheels or stuck pistons. Repair kits can be purchased at Porsche
Motorsport.
Refer to the maintenance section, chapter 7.4.7 „Replacing the piston seal rings"
MY 2015

Version: 16.12.2014