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Cantilever Brakes - Utilizing a Straddle Cable
The length of the straddle cable, the height of the straddle hanger, and
the brake pad-to-caliper arm position all have an effect on braking
power. Generally, the straddle cable bridge is set low and close to the
tire for maximum braking force. The straddle cable should be high
enough, however, to adequately clear the tire (and any debris that
may stick to the tire) or to fit over the front reflector hanger. In the
event of brake cable failure, the front reflector hanger would prevent
the straddle cable from catching in the tire and locking up the front
wheel. The straddle cable length (when adjustable) is set to transfer
as much force to the brake pads as possible. For the most efficient
transfer of force, the straddle cable and the line between the
cantilever pivot and the cable anchor should form a right angle (90
degrees). If the force is not at a right angle, part of the force gets
wasted in pulling on the brake post, which has no effect on braking.
V-Style Brakes
If not already assembled, take the brake noodle from the parts box
and slide the cable through the larger opening. The cable housing will
then seat into the end of the noodle. Slide the cable through the cable
lead on the end of the left brake arm, this will cause the noodle to fit
into the lead. Slip the brake cable boot over the cable and position it
between both brake arms. Next, loosen the 5mm anchor bolt at the
end of the right brake arm and slide the cable under the retaining
washer. Pull the slack out of the cable making sure a distance of
39mm or more remains between the end of the lead and the start of
the anchor bolt. Once the cable is secured to the brake arms, engage
the brake lever several times, checking the position of the brake
shoes at the rim. The brake shoes should be 1mm away from the rim
when in a relaxed position. When the brake lever is engaged, the
brake shoe should hit the rim flush (never the tire) with the front touch-
ing slightly before the rear. If this position is not achieved, adjustments
to the brake shoe are required. Loosen the brake shoe hardware and
reposition the brake shoe. It may take several shoe and cable adjust-
ments before the required position is accomplished.
Straddle
Cable
Brake
Brake Cable
Straddle Hanger
Straddle Cable
Cable
Anchor
Caliper Arm
Pinch Bolt
Pivot
90
o
Brake
Noodle
Outer
Cable
Lead
Brake
Cable
Boot
Anchor
Bolt
Brake
Arm
Tension
Screw
Brake
Shoe
Pivot
Bolt