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5.6. Mechanical and Hydraulic Disc Brakes
5.6.1. Functioning and Wear
Actuating the hand lever on the handlebar causes a stationary brake
pad or two moving brake pads to be pressed against a rotating braking
surface, and the resulting friction slows down the wheel. The rate of de-
celeration 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.
In the wet, disc brakes respond much faster and more forcefully 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 engaging 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.
Danger:
Damaged cables should be
replaced immediately, as they
can snap. Risk of accident!
Danger: Disc brakes are susceptible to overheating during
braking. Therefore, do not touch the disc or brake
calliper after extensive usage of your brake, e.g. after riding downhill.
Caution: Ensure that rotors and brake pads are absolutely
free of wax, grease and oil. Brake pads, once
contaminated with oil cannot be cleaned, but have to be replaced!
Note:
Wet conditions and/or a
heavily clogged brake can lead
to squeaking noises during
braking.
Note:
When replacing brake pads,
be sure to only use marked
original spare parts matching
your brake.
The Brake System
Danger: Leakages in the lines of hydraulic brakes may
render them ineffective. Remove such leakages
immediately, otherwise risk of accident!
28


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