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MY21P01 - 42_1.0_20.08.2020 19
Overview
3.1.3.3 Back-pedal brake
Figure 12: Brake system with a back-pedal brake –
example
1 Rear wheel rim brake
2Handlebars with brake lever
3 Front wheel rim brake
4Pedal
5 Back-pedal brake
The back-pedal brake stops the movement of the
rear wheel when the rider pedals in the opposite
direction to the direction of travel.
3.1.3.4 ABS
Figure 13: BOSCH ABS
1 ABS control unit with housing
2 Display
3 ABS indicator lamp
4 Control panel
5 Front wheel brake lever
6 Brake calliper
7 Bike speed sensor
8 Sensor disc
ABS is an added function in some pedelecs.
BOSCH ABS
The rear wheel brake function does not depend on
the anti-blocking system (ABS) functioning
correctly.
When the brakes are applied, the ABS function
detects critical slippage thanks to the wheel speed
sensors on the front and rear wheels. The ABS
limits slippage on the front wheel by reducing
brake pressure there, thus stabilising the wheel.
Once the wheel has been stabilised, the wheel is
brought to the blocking limit by building up
pressure selectively.
If the wheel blocks again, the pressure is reduced
again. This process is repeated to keep the wheel
at its limit of traction, thus making optimum use of
the coefficient of friction between the tyres and the
road surface.
5
2
3
4
1
1
1
2
(1) (2) (3) (4) (5)
(6)
(6)
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