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Stevens Race - 2014 Seite 22

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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 emergency brak-
ing is also a study in physics. In the process of braking, the rider’s weight
shifts forward, thus reducing the load on the rear wheel. With good road
conditions, the rate of deceleration is primarily limited by the danger of
overturning 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.
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 negatively
or cause the tyre to slip on the inner rim. Sudden loss of pressure while
cycling can result in a serious accident.
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 accidents.
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.
The Brake System
5.1. Functioning and Wear of Rim Brakes
Actuating the hand lever on the handlebar causes a stationary brake pad
to be pressed against a rotating braking surface, and the resulting friction
slows down the wheel. The rate of deceleration 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 surfaces,
this changes the coefficient of friction. This is why rim brakes respond at
a slight delay and less powerfully in wet weather. In order to maintain
their effectiveness brakes need to be checked and readjusted from time
to time.
The friction generated by braking causes wear to the brake pads as well
as to the rims. Frequent rides in the rain and soiling hasten wear on both
engaging surfaces. Once the abrasion of the rim has reached a certain
critical point, the rim may break under the tyre pressure. This can make
the wheel jam or the inner tube burst, both of which can cause a fall!
See your STEVENS dealer and ask them to examine the remaining thick-
ness of the rims when you have worn through your second set of brake
pads at the latest. Your bicycle dealer has special measuring devices for
determining the remaining thickness of the rims.
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 carefully
when riding on wet or slippery
roads, as the tyres can easily
slip away. Therefore, reduce
your speed in general when
riding in such conditions.
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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