PGO PMX Sport 50 Service Manual page 98

4.Disassembling and assembling the front brake disk.
a. Remove the front wheel.
b. Remove the three nuts on the disk.
c. Remove the disk.
d. To assemble the disk, please reverse the disassembling procedure.
Locking torque M8:2.0~3.0kg-m
5.Checking for the front brake-disk. Standard thickness:3.6mm
Limit of use:
Replace a new one when below 3.1mm
6.Check the front brake lining.
a. Standard thickness:4.0mm.
Limit of use:Replace a new one when the thickness is below 2.0mm.
Note: No grease allowed on the lining.