Mash Side 400 Mode D'emploi page 39

Brake piece checking
Operating brake, if the wears limit line of the brake shoe
touch to the side of the brake disc. It shows that the brake shoe has
touched the wear limit.
Warning
When it is replaced with a new brake strip or brake disc,
do not drive it immediately; instead, drive it after holding and
releasing the front brake handle until the brake strip and the
brake disc are well engaged.
Rear brake
Pushing the brake pedal by hand, checking the resistance, to
confirm the move of the brake pedal weather is good. If not, it could
be adjusted by adjusting the rear brake adjustment nut. Twirling the
nut to adjust the pedal stroke. Pushing the brake pedal by hand till
feeling resistance . Validation the pedal free stroke whether is in the
scope of regulations.
Brake pedal free stroke：18-25mm
The rear brake caliper interlocks with the side brake rear caliper
(controlled by rear brake pedal)
36
Adjustment nut.