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MY20B01 - 52_1.0_02.10.2019 18
Overview
3.1.3.2 Disc brake
Figure 11: Brake system with disc brake – example
1Brake disc
2 Brake calliper with brake linings
3Handlebars with brake lever
4 Front wheel brake disc
5 Rear wheel brake disc
On a pedelec with a disc brake, the brake disc is
screwed permanently to the wheel hub.
The brake lever is pushed to increase brake
pressure. The brake fluid is used to transfer
pressure through the brake lines to the cylinders
in the brake calliper. The braking force is boosted
by a speed reduction and applied to the brake
linings. These apply the brake disc mechanically.
If the brake lever is pushed, the brake linings are
pressed against the brake disc and the wheel
movement is decelerated until it comes to a stop.
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 screen
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.
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