Merida Bike Manuel d'utilisateur télécharger pdf (Page 33)

Rim brakes

Racing/Side-pull brakes

Functioning and wear

Actuating the levers on the handlebars

(e)

and cables

(f)

causes a brake pad

(g)

to be pressed against a brake

surface. Thehe ensuing friction slows down the wheel. If

water, dirt or oil come into contact with one of the brak-

ing surfaces, this changes the coefﬁcient of friction and

deceleration is reduced. This is why brakes respond with

a slight delay and less powerfully in wet weather.

In order to maintain their effectiveness, brakes need to

be checked and readjusted at regular intervals.

The friction generated by braking causes wear to the

brake pads as well as to the rims. Frequent rides in the

rain and dirt and over hilly terrain can accelerate wear

on both braking surfaces. Some rims are provided with

wear indicators, e.g. grooves or circular indentations.

If the rim is worn down to the point where the grooves

or indentations are no longer visible, it needs to be

replaced. Once the abrasion of the rim has reached a

certain critical point, the rim may break under the tire

pressure. This can make the wheel jam or the inner tube

burst, both of which can cause an accident! Risk of an

accident!

Functional check

Test the brakes in stationary by ﬁrmly pulling the brake

levers towards the handlebars. The brake pads of rim

brakes must hit the rim evenly with their entire surface

without touching the tire during braking, in open condi-

tion or in between.

Check whether the brake blocks are perfectly aligned

with the rims and are still sufﬁciently thick. You can

judge the wear of the brake pads by the appearance of

the grooves. If the pads are worn down to the bottom

of the grooves

(h)

, it is time to replace them. Be sure to

observe the corresponding instructions of the respective

manufacturer.

The brake lever must always remain clear of the han-

dlebars. You should not even be able to pull them all

the way to the handlebars in the event of an emergency

stop. If this is the case, however, observe the following

chapter “Synchronizing and readjusting”.

See your MERIDA dealer and ask him to examine the

remaining thickness of the rims when you are through

your second set of brake pads at the latest. He has

special measuring devices to determine the remaining

thickness of the rims.

Both brake arms must hit the rim simultaneously, when

you actuate the brake lever. They must keep off the tire.

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Merida Bike Manuel d'utilisateur Page 33

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