Disc brakes
Most disc brakes consist of the following
parts: a steel brake disc secured to the
wheel hub, and callipers attached to the fork
and the frame. Since the brake disc rotates
with a precision of a tenth of a millimetre,
the distance between the brake disc and the
brake pads can be minimised. Compared to
brakes that act on the wheel rim, the disc
brake represents an extremely efficient
brake system due to its greater displacement. The high pressure
required to move the pads of disc brakes is produced hydraulically.
The correct setting of the brake requires dexterity and
experience. If you would rather not perform this setting by
yourself, turn to a specialist service centre. An incorrectly adjusted
brake can cause serious mechanical damage to your bicycle. To
ensure the correct setting, please read the user guide provided by
the manufacturer of the brake system.
The brake pads of disc brakes need to wear down sufficiently
to exert their full braking force. Disc brakes can only be fitted
on bicycles that have been correctly prepared for this.
Figure 26
Ábra 27
Rim brakes
Rim brakes are nowadays used almost only
on racing bikes. With these brakes, the
brake bodies are suspended vertically and
so form a closed system. Rim brakes are
simply inserted into pre-bored holes to
attach them to the frame or the fork. Make
sure that the wheel is at the centre of the
brake, and that both brake pads touch the
rim at the same time when the brake lever
is squeezed.
If this is not the case, the brake needs to be adjusted. On brakes with a
single point of rotation, turn the mounting screw to the correct position
using a spanner. On brakes with two points of rotation, centre the brake
with the grub screw.
Always adjust the brake in small steps, and check its correct
centring by squeezing the brake lever. To assist a quick wheel
change, rim brakes are equipped with a quick-release clamp. Before
each ride, check that this clamp is in closed position, as the brake will
not function correctly if it is open.
To ensure that the brake is set correctly, please read the user
guide provided by the manufacturer of the brake system.
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