Dynacraft MOUNTAIN BIKE Owner's Manual page 26

C
7C. Disc Brakes
When installed properly, the disc brake rotor should be centered
between the brake pads, and securely fastened to the wheel (see
Figure 34). Use (C) a 4, 5, or 6 mm Allen Wrench to check the rotor
mounting bolts to ensure that none of the bolts are loose. To tighten
the brake cable, loosen the cable anchor bolt, pull the cable taught,
and re-tighten the bolt (see Figure 35).
Ensure that the mounting bolts on Disc Brake are evenly tightened
(see Figure 35). If not, the Disc Brakes will be out of alignment with the
Rotor, and you will not be able to brake efficiently or safely.
NOTE:
If your bike is equipped with a disc brake, make sure that the disc
rotor slides easily into the brake caliper when installing the front wheel. DO
NOT pull on the lever before the wheel is installed. It may cause the brake pads
to bind together and it is difficult to separate them without the proper tools
and expertise.
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Figure 34
Figure 35