SRAM eTap AXS Service Manual page 18

Remove the brake pads from the caliper.
3
Brake pads must be replaced if the total thickness of the backing
plate and pad friction material is less than 3 mm.
Install the Monoblock bleed block into the caliper, then install the pad
4
retention bolt.
NOTI CE
Digital caliper
Monoblock bleed block
2.5 mm
20 mm or 15 mm Thru Axle
18
Hose Removal