MY21H01 - 22_1.0_30.08.2020
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Overview
3.1.3 Brake system
Every pedelec has a hydraulic brake system. The
brake fluid is in a closed hose system. If the rider
pushes the brake lever, the brake fluid activates
the brake on the wheel.
The pedelec has either:
• a rim brake on the front and rear wheels
• a 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 bicycle to a
halt quickly and safely in the event of an
emergency.
3.1.3.1 Disc brake
Figure 7: Brake system with disc brake – example
1 Brake disc
2 Brake calliper with brake linings
3 Handlebars 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.
3.1.3.2 Rim brake
Figure 8: Brake system with rim brake in detail – Magura
HS22 used as an example
1 Rear wheel rim brake
2 Brake booster
3 Brake lining
4 Handlebars with brake lever
5 Front wheel rim brake
Figure 9: Rim brake locking lever, closed (1) and open (2)
The rim brake stops the wheel moving when the
rider pushes 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. The rim brake locking
lever is not marked with any lettering. Only a
specialist dealer may set the rim brake locking
lever.
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