Schwinn none - Manual (Page 78)

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Some brakes have a quick release mechanism to allow easier wheel removal. Whenever you adjust the brakes,
make sure the quick release mechanism is in the closed position.
Never ride unless the quick release is firmly locked in the closed position.
Lubrication
The brake lever and brake caliper pivot points should be oiled with
2-3 drops of light oil at least every three months to ensure smooth
operation and to reduce wear. Cables should be greased along
their entire length, after removing them from their casings, at least
every six months. Always grease new cables before fitting.
Adjustment - Sidepull Calipers
Minor brake adjustment can be made via the cable
adjusting barrel, usually located at the upper cable arm. To adjust,
squeeze the brake pads against the rim, loosen the lock nut and
turn the adjuster Brake pad clearance should be a maximum 2mm
from the rim. When correct, re-tighten the lock nut. If the pads
cannot be set close enough to the rim in this manner, you may
have to adjust the cable length. Screw the barrel adjuster 3/4 of the
way in, squeeze the pads against the rim, undo the cable anchor
bolt and pull the cable through with pliers. Re-tighten the cable
anchor bolt and apply full force to the brake lever to test, then fine
tune using the barrel adjuster. If one pad is closer to the rim than
the other, loosen the fixing nut at the back of the brake, apply the
brake to hold it centered, and re-tighten the fixing nut.
Brake Lever
Brake Lever Housing
Cable Adjusting Barrel
Lock nut
Cable Adjusting Barrel
Center Bolt
Brake Shoe
Side-Pull Brakes
Fixing Nut
in Back
Cable
Anchor
Bolt
Ensure the Brake fixing nut is secured tightly.
Failure to do this may cause the Brake assembly
to dislodge from the fork.