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21
5. The Brake System
In general the brakes of your bicycle are necessary to adjust your speed
to the traffic situation. However, in an emergency the brakes must be
able to bring your bicycle to a halt as quickly as possible. Such emer-
gency braking is also a study in physics. In the process of braking, the
riders weight shifts forward, thus reducing the load on the rear wheel.
The rate of deceleration is primarily limited by the danger of overturn-
ing and only in the second place by the road grip of the tyres. Such a
problem becomes particularly acute when riding downhill. In the event
of an emergency braking you have to try to put your weight back as far
as possible.
The Brake System
Actuate both brakes simultaneously and bear in mind that due to the
weight transfer the front brakes can achieve a higher braking force.
With rim brakes long lasting braking or permanent dragging of the
brake pads can overheat the rim. This can affect the inner tube nega-
tively or cause the tyre to slip on the inner rim. Sudden loss of pressure
while cycling can result in a serious accident.
Danger:
The assignment of brake
lever to brake pad, e.g. left
lever acts on front brake, can
vary. Make yourself familiar
with the lever-to-brake
assignment or ask your
STEVENS dealer to change
the brakes as you want
them.
Danger:
Actuate the brakes care-
fully when riding on wet or
slippery roads or o-road,
as the tyres can easily slip
away. Therefore, reduce
your speed in general when
riding in such conditions.
With disc brakes prolonged braking or permanent dragging of brake
pads can overheat the brake system. This can result in a loss of braking
force, even to the point of total brake failure, provoking serious acci-
dents.
Therefore, check your riding manners and make it a habit to brake hard
and then to open the brake again, whenever the road surface and the
situation allows it. It is better to stop for a moment and let the rim cool
down rather than to risk anything.
5.1. Functioning and Wear
Actuating the hand lever on the handlebar or back-pedalling causes a
stationary brake pad to be pressed against a rotating braking surface,
and the resulting friction slows down the wheel. The rate of deceler-
ation is not only determined by the force with which the brake pad is
pressed against the braking surface, but also to a decisive degree by
the coefficient of friction, which depends on the two materials that are
rubbed against each other.
When water, dirt or oil gets in contact with one of the engaging surfac-
es, this changes the coefficient of friction. This is why brakes respond at
a slight delay and less powerfully in wet weather. This applies in par-
ticular to rim brakes.
In order to maintain their effectiveness brakes need to be checked and
readjusted from time to time.
Danger: Be careful while getting used to the brakes.
Practise emergency stops in a place clear of traffic
until you are comfortable controlling your bicycle. This can save you from
having accidents.
22


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