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operated by pedaling backwards. This is called a Coaster Brake and is
described in Appendix C.
WARNING:
1. Riding with improperly adjusted brakes, worn brake pads, or
wheels on which the rim wear mark is visible is dangerous
and can result in serious injury or death.
2. Applying brakes too hard or too suddenly can lock up a
wheel, which could cause you to lose control and fall. Sudden
or excessive application of the front brake may pitch the rider
over the handlebars, which may result in serious injury or
death.
3. Some bicycle brakes, such as disc brakes (g. 11) and
linear-pull brakes (g. 12), are extremely powerful. Take extra
care in becoming familiar with these brakes and exercise
particular care when using them.
4. Some bicycle brakes are equipped with a brake force
modulator, a small, cylindrical device through which the brake
control cable runs and which is designed to provide a more
progressive application of braking force. A modulator
makes the initial brake lever force more gentle, progressively
increasing force until full force is achieved. If your bike is
3. Before you ride the bike, rst check that the seat post is securely
clamped.
Adjusting the seat post cam action mechanism
The action of the cam squeezes the seat collar around the seat post to
hold the seat post securely in place. The amount of clamping force is
controlled by the tension adjusting nut. Turning the tension adjusting nut
clockwise while keeping the cam lever from rotating increases clamping
force; turning it counterclockwise while keeping the cam lever from rotating
reduces clamping force. Less than half a turn of the tension adjusting nut
can make the difference between safe and unsafe clamping force.
WARNING: The full force of the cam action is needed to clamp
the seat post securely. Holding the nut with one hand and
turning the lever like a wing nut with the other hand until
everything is as tight as you can get it will not clamp the seat
post safely.
WARNING: If you can fully close the cam lever without wrapping
your ngers around the seat post or a frame tube for leverage,
and the lever does not leave a clear imprint in the palm of your
hand, the tension is insufcient. Open the lever; turn the
tension adjusting nut clockwise a quarter turn; then try again.
C. Brakes
There are three general types of bicycle brakes: rim brakes, which operate
by squeezing the wheel rim between two brake pads; disc brakes, which
operate by squeezing a hub-mounted disc between two brake pads; and
internal hub brakes. All three can be operated by way of a handlebar
mounted lever. On some models of bicycle, the internal hub brake is
26


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