Merida Bike Manuel d'utilisateur télécharger pdf (Page 37)

Adjusting the brake lever reach

With disc brakes the brake levers can be adjusted to the

size of your hands, too, allowing you to operate them

with optimal effectiveness

(e+f)

For more information see the chapter “Adjusting the

brake lever reach on MERIDA road bikes” and in the

original operating instructions of the brake manufacturer

on this MERIDA CD-ROM.

After adjusting, check the functioning and make sure the

brake pads do not drag when releasing the brake lever

and spinning the wheel.

Mechanical and hydraulic disc brakes

Functioning and wear

Actuating the hand lever on the handlebar causes sta-

tionary brake pads to be pressed against a rotating brak-

ing surface. The ensuing 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 co-

efﬁcient of friction, which depends on the two materials

that are rubbed against each other.

In the wet, disc brakes

(g+h)

respond much faster than

rim brakes. They also require fairly little maintenance

and do not wear down the rims as rim brakes do. One

drawback of disc brakes is that they tend to be noisy

when they are wet.

When water, dirt or oil gets in contact with one of the en-

gaging surfaces, this changes the coefﬁcient of friction.

This is why disc brakes respond at a slight delay and

less powerfully in wet weather. The friction generated by

braking causes wear to the brake pads as well as to the

rotors! Frequent rides in the rain hasten wear on both

engaging surfaces.

Leakages in the lines of hydraulic brakes may

render them ineffective. Remove such leak-

ages immediately, otherwise risk of accident!

Damaged cables should be replaced immedi-

ately, as they can snap. Risk of an accident!

Disc brakes are susceptible to overheating

during braking. Therefore, do not touch the

disc or brake caliper after extensive usage of

your brake, e.g. after riding downhill.

Ensure that rotors and brake pads are ab-

solutely free of wax, grease and oil. Brake

pads, once contaminated with oil cannot be

cleaned, but have to be replaced!

Wet conditions and/or a heavily clogged

brake can lead to squeaking noises during

braking.

When replacing brake pads, be sure to only

use marked original spare parts matching

your brake.

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Merida Bike Manuel d'utilisateur Page 37

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