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b
c
da
The risk of overheating is particularly high with closed brake systems (a).
Brake overheating occurs on prolonged (steep) downhill rides with per-
manent brake dragging. Brake fade is a result thereof which, in extreme
cases, may lead to brake failure. Therefore, if you notice a reduction of
the braking effect, stop and let the brake system cool down. Sometimes,
it will be enough to operate the front and rear brake in an alternating
pattern. If that will not sufce, stop for a couple of minutes before you set
off again.
5.4.2 Checking and Readjusting Back-Pedal Brakes.
This brake is operated by pedalling backward. For maximum braking
power, step on one of the pedals in its rearmost position with the cranks
horizontal. With SRAM models braking power is increased when you
have switched to a lower gear beforehand.
With back-pedal brakes the chain tension has to be checked regularly
(b). The amount of play, midway between chainring and sprocket, should
not be more than two centimetres.
If there is any play, have the chain tightened by your BMW partner!
Check regularly whether the brake torque arm (torque sup-
port) (c) is still rmly attached to the frame or fork. Use a torque
wrench (d) and never exceed the maximum tightening torque!
You will nd the prescribed values in chapter “Recommended
Tightening Torques”, directly on the components and/or in
the manuals of the component manufacturers.
Please note that there is no rear wheel braking with a slipped
chain! Risk of accident!
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