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23.5 Disc brakes
In the case of disc brakes, the brake discs are
located on the hub and the brake caliper on the
frame or on the fork.
It is essential to test the brakes every time you
change the brake setup. To do this, pull on the
brake lever and push the pedelec strongly for-
wards. Only ride your pedelec if you are able to
safely stop it.
In the case of disc brakes, some time is re-
quired to wear in the discs and pads. The brak-
ing system only delivers its full performance
after around 10 braking cycles from 30 km/h.
The braking force increases during this time.
Consider this during the entire duration of the
wearing-in period.
This wearing-in period is also required after
replacing the brake pads or disks.
Pay attention to any unusual noise when
braking, as this could be a sign that the brake
pads have worn down to the wear limit. Please
check the thickness of the brake pads after the
brakes cool down. If required, you have to have
the brake pads replaced.
Ensure you have the brake pads replaced
if they are tainted with oil or grease. Clean
the brake disc with isopropyl alcohol if oil or
grease gets onto the disk, otherwise the brak-
ing performance will be considerably reduced.
The quick release lever for the wheel has to
be installed on the opposite side to the brake
disc. Otherwise you could suffer burns from the
brake disk when operating the lever. The clamp-
ing force of the quick release can be reduced if it
is heated by the brake disk.
Have the brake disk replaced if it is worn out
or bent. This replacement procedure has to be
carried out by a specialist retailer.
If the remaining
thickness of the brake
pads is less than 0.5
mm, these have to be
replaced. As this is a
vital part for your safety,
this work should be car-
ried out by a specialist
retailer.
23.5.1 Hydraulic disc brakes
There is a master cylinder on the brake lever of
the hydraulic disk drakes. The hydraulic fluid is
connected to the braking cylinders via a tube
and the brake pads are pressed against the
brake discs via brake pistons. Hydraulic disc
brakes can have a strong braking effect. This
type of brake does not require much servicing.
Setting up and servicing disc
brakes has to be done by spe-
cialist retailer. Incorrectly set
up brakes can cause accidents and seri-
ous injuries.
Please do not touch the brake
disc while it is rotating. Pay
attention to this when fitting,
removing and servicing the brakes. You
can suffer serious injuries if your fin-
ger is caught in the gaps of a rotating
disc brake.
The brake caliper and disc can heat up
during braking. You could suffer burns if
you touch this part during or directly af-
ter braking. Only set the brakes up after
you have ensured that the parts are suf-
ficiently cooled.
You may only fit a disc brake
system on your pedelec if the
corresponding fittings for at-
taching it to the frame and fork are al-
ready available. If you are unsure, ask a
specialist retailer.
Source: Shimano
®
techdocs
New: 2 mm
Worn: 0.5 mm
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