Kalkhoff Derby Instruction Manual - page 27
Carry out a braking test after each adjustment by pushing the bicycle strongly
whilst pulling the brake lever. Only use your bicycle when it can be safely braked.
Check the tubes and connections for leaks each time before riding. Leaking tubes and
connections can result in brake fluid leaking out of the braking system. This can lead
to reduced efficiency of the brakes.
Do not use the brakes further if oil leaks out; have the appropriate repairs carried out
by a dealer without delay.
If you continue to ride in this condition, there is a large risk of brake failure. If the
brake blocks have come into contact with oil or grease they must be replaced. If the
brake disc has come into contact with oil or grease it must be cleaned, otherwise bra-
king efficiency may be strongly impaired.
Steam bubble formation
●
Steam bubble formation may occur if the brakes are applied constantly.
Therefore, Release the brake lever from time to time in order to avoid such a situation.
●
Steam bubbles are formed when the oil heats up to the extent that water in the
braking system boils and air bubbles expand.. Due to this, the brake lever travel can
suddenly become larger.
The bicycle is stored or transported upside down, air bubbles may form
in the brake system reservoir.
If the bicycle is used in this condition, there is a risk of brake failure which could lead
to a serious accident.
After bringing the bicycle back into an upright position, the brake lever must be pulled
a few times to check that the brakes respond normally. If the brakes do not respond
normally, they must be adjusted as follows:
➢
Set the brake lever parallel to the ground and pull it a few times slowly so that
the bubbles return to the reservoir.
➢ If the response is still bad after this, the brake system needs to be bled. Consult a
dealer.
Brake pads and brake blocks are consumable parts.
Have the brake pads of hydraulic oil pressure disc brakes checked regularly by
a dealer and replaced if necessary.
Removing / refitting the wheel
➢
It is recommended to use a brake block spacer when removing the wheel. The use
of a brake block spacer can prevent the pistons falling out if the brake lever is
pulled after the wheel has been removed.
➢
If the brake lever is pulled and no brake block spacer is fitted, the pistons can
move as usual. Use a flat blade screwdriver to push the brake blocks back, taking
care not to scratch them. (If the brake blocks are not fitted, push the pistons back
carefully without damaging them). If it is difficult to push back the brake blocks
or pistons, remove the lid of the reservoir and try again. (please remember that oil
may overspill from the reservoir).
➢
After fitting the wheel, check whether or not the quick release lever is located on
the right-hand side (opposite side to the brake disc). If the quick release lever is
located on the same side as the brake disc, there is a danger that the lever and
the brake disc could impair one another
Cleaning the braking system
If the brake blocks have come into contact with oil or grease they must be replaced. If
the brake disc has come into contact with oil or grease it must be cleaned, otherwise
braking efficiency may be strongly impaired.
➢
Use isopropanol, soapy water or a dry cloth to clean and maintain the braking
system. Do not use commercially available brake cleaning agents or agents for
preventing brake noises as these may damage parts such as seals.
Drum brakes and roller brakes
In the case of roller and drum brakes, the braking power is transmitted from the brake
lever via a cable to the braking system. Roller or drum brakes become very hot when
subjected to constant load. Braking efficiency is thus reduced. The brakes may fail com-
pletely. Adjust your riding style accordingly.
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DCW BedienA_GB UNI.qxd 24.10.2007 12:50 Uhr Seite 28