Owner`s manual

101
Some brakes have a special mechanism which enables you to set
the clearance on either side of the rim using a screwdriver. Brake
pads should finally be adjusted so that the leading edge of the
pad makes first contact with the rim. Some brakes have special
curved washers to allow this, but on less complex models it will be
necessary to apply a little force to the pad and its mounting.
Adjustment - V-Style Brakes
Minor brake adjustment can be made via the barrel cable adjusters
which are located on each brake lever. To adjust, squeeze the
brake pads against the rim, loosen the lock nut, and turn the
adjuster to pull the brake pads closer to, or spread them away from
the rim as required.
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
length of the brake cable by loosening the fixing bolt, then pulling or
pushing the cable through the fixing bolt to adjust the length, and
finally re-tightening the fixing bolt.