Operating instructions NJ1 & FREAK Compact bike
19
reverse movement by operating the crank
release function.
The braking function via the backward
movement (crank movement against the
direction of acceleration) is always guaranteed
– with the crank release function activated or
deactivated.
The crank release function can also be
selected in combination with the Shimano
Nexus Inter7 and 8 hub drives (which already
have back-pedal brakes) so that it is possible
to reverse and manoeuvre. The back-pedal
brake is implemented here via the hub drive. In
this case it must be ensured that the hub
drive's back-pedal brake is not operational
when the crank release function is activated. If
you want to brake with the activated crank
release function, this is only possible via the
additional braking system such as a rim brake.
Figure 30: Generator unit PRO ACTIV back-pedal
brake
16.5.2 Operation
The
brake
is operated by pushing the cranks
backwards. The brake force applied is adjusted
by the strength of the backwards movement of
the cranks.
The
crank release function
is operated by
pressing the side pressure plate. To activate
the crank release function, the left-hand
pressure plate must be operated (seen from
the direction of travel). To return to normal
driving operation with the back-pedal brake,
the right-hand pressure plate must be
operated.
Figure 31: Left- and right-hand pressure plates
16.5.3 Safety
instructions
Before every trip, perform a brake test
while stationary by moving the cranks with the
normal operating force in the opposite direction
to acceleration. The drive wheel must not be
able to move when the system is operated.
At regular intervals, check that all of the
connections, lines, bleed screws and the
surface of the transmitter unit do not leak and
that all the screw connections on the brake
system are tightened securely.
At regular intervals, check that the brake
pads and discs are free from grease, oil or
other contamination. In addition, check the
thickness of the brake disc. The minimum
thickness is printed on the brake disc. In
addition, the brake pad thickness must be
checked with a measuring calliper. The
minimum pad thickness plus support material
is 2.5 mm. Measure the pad thickness at the
thinnest point.
Do not drive if your brake system is faulty
in one of the previously listed points. Contact
your dealer immediately who will arrange
maintenance by PRO ACTIV.
Deactivating the
crank release
function
Activating the
crank release
function
