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MY21B03 - 32_1.0_23.12.2020 16
Overview
3.1.3 Brake system
Every bicycle 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 bicycle 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 Rim brake
Figure 15: Brake system with rim brake in detail – 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
Figure 16: 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.
3.1.3.2 Disc brake
Figure 17: 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 bicycle with a disc brake, the brake disc is
screwed permanently to the hub of the wheel.
The brake lever is pushed to increase brake
pressure. The brake fluid is used to transfer
pressure through the brake cables 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.
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