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MY20B04 - 2_1.0_02.10.2019 17
Overview
3.1.2 Brake system
The pedelec's brake system comprises either a
hydraulic:
rim brake on the front and rear wheels
disc brake on the front and rear wheels or
a rim brake on the front and rear wheels and an
additional back-pedal brake.
The mechanical brakes are used as an emergency
stop system and bring the pedelec to a halt quickly
and safely in the event of an emergency.
3.1.2.1 Rim brake
Figure 9: Rim brake components with details;
Magura HS22 used as an example
1 Rear wheel rim brake
2 Brake booster
3 Brake lining
4Handlebars with brake lever
5 Front wheel rim brake
The rim brake stops the wheel moving when the
rider pulls the brake lever, causing two brake
linings, positioned opposite one another, to be
pressed onto the rims. The hydraulic rim brake
features a locking lever.
Figure 10: Rim brake locking lever, closed (1) and open (2)
3.1.2.2 Disc brake
Figure 11: Pedelec brake system with a 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.
3.1.2.3 Back-pedal brake
Figure 12: Pedelec 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.
The rim brake locking lever is not marked with any lettering.
Only a specialist dealer may set the rim brake locking lever
2
5
17


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