18
X-3.
Disc brakes
With this brake type, the brake discs are on the hub and the brake caliper is on the frame or
fork.
WARNING:
Have your disc brakes adjusted by a specialist cycle shop. If
this is done incorrectly, an accident may occur.
Once the brakes have been adjusted, always perform a brake
test by pushing the bike quickly forwards and operating the
brake lever. You should only use your bike if you can safely
stop it using the brakes.
Disc brakes require a brake lead time during which the braking
force increases. Bear this oi in mind throughout the entire brake
lead time. The same effect also occurs after replacing the brake
block or disc.
If you hear unusual noises when braking, the brake blocks may have reached their wear
limit. Allow the brakes to cool down then check the brake block depth. Have the brake
blocks replaced if necessary.
WARNING:
When installing, removing and carrying out maintenance on the
wheel, do not touch the brake disc with your fingers when rt is
turning. You could be seriously injured rf you catch your fingers
in the cutouts of the brake disc.TTie brake caliper and the disc
can become - extremely hot when braking. You should therefore
not touch these parts when riding the bike or immediately after
dismounting as you could burn yoursetf. Before adjusting the
brakes, check that the parts have cooled down sufficiently.
NOTE:
You must only fit a disc brake on your bike providing suitable mounting devices are
installed on the frame and the bike fork. If in doubt, consult a specialist cycle shop.
If the brake blocks come into contact with oil or grease, they must be replaced. If the
brake disc comes into contact with oil or grease, it must be cleaned as otherwise its
braking performance will be drastically reduced.
Check whether the quick-release lever for the wheel is on the side opposite the brake
disc. If the quick-release lever is on the same side as the brake disc, there is a danger
you could bum yourself when operating the lever. Ihe heat in the brake disc could also
reduce the clamping force of the quick-release device.
If the brake disc is worn, cracked or bent it must be replaced. Have this work carried out
by a professional bike workshop. If the depth of the brake blocks is less than 0.5mm,
they must be replaced.
X-3.1: Hydraulic disc brake
The hand brake lever of the hydraulic disc brake is equipped with a master cylinder. The hy-
draulic fluid is fed through a tube to the brake cylinders. This actuates the brake pistons which
push the brake blocks against the brake disc. This type of brake requires little maintenance and
can be very powerful.
