The eBike ABS is designed to support riders when braking on a wide variety of surfaces and in most hazardous situations. The eBike ABS has two basic functions for this purpose.
The Bosch eBike ABS control unit regulates the brake pressure on the front wheel during heavy braking so that it does not lock. As with a car, the pedelec brakes at intervals until it comes to a standstill. Steerability is maintained and the rider remains safe and stable in the saddle.
In addition, the intelligent rear wheel lift-off control reduces the risk of the rear wheel lifting off if the front wheel overbrakes extremely hard. This prevents unsightly handlebar drops and rollovers, especially on slippery surfaces or downhill gradients.
With different modes (Cargo, Touring, Allroad and Trail), the eBike ABS can be used on bikes for urban use as well as on sporty mountain bikes. Performance-orientated trail bikers can use the ABS to brake with greater control even in unexpected situations and on a wide variety of surfaces. The conclusion of Bosch accident research was that 29% of all pedelec accidents could have been avoided with eBike ABS.
How the eBike ABS system works
The new Bosch eBike ABS consists of a control unit and the ABS features integrated into the system (indicator light and ABS tile on the display), two wheel speed sensors and the Magura MT C ABS brake components including the ABS brake and sensor discs.
The innovative control function of the eBike ABS places special demands on the brake sensor. The most important feature of the new MT C ABS brake lever is the larger oil delivery volume to allow the brake pressure to be controlled by the control unit. Compared to the familiar MT brake levers, Magura developed the MT C ABS brake lever with a 12 mm instead of 10 mm large master piston in order to be able to provide the larger oil delivery volume.
Normally, a larger master piston inevitably leads to higher actuation forces for the rider. To solve this problem, Magura has established new lever kinematics in the axial sensor of the MT C ABS family. The adapted design of the deflection kinematics reduces the required manual force and ensures a short lever travel as well as easily controllable braking power. Depending on the area of application, 2-finger brake levers or 3-finger brake levers are used. As is typical for Magura, the brake levers can be changed individually.
One-piece forged 2- or 4-piston brake callipers provide the necessary braking power and stability, familiar from the award-winning Magura MT. The rigid design is the basis for high deceleration values and good heat dissipation. Perfect for e-bikes to ensure constant braking even at high speeds and loads.
MDR-C (180 mm / 203 mm) or MDR-P models (180 mm / 203 mm / 220 mm) are used as brake discs. Sensor discs mounted on the brake disc enable the wheel speed to be measured by the ABS wheel speed sensor and immediately detect critical locking of the front wheel and lifting of the rear wheel. The sensors are inconspicuously integrated into the Magura adapters or mounted on the fork or frame.
To make servicing easier, the ABS control unit uses the Easy Link connectors already familiar from the Magura Cockpit Integration (MCi). This makes it very easy to disconnect and remove the brake lever or brake calliper for servicing.
The new Bosch eBike ABS with Magura MT C ABS components will be available on complete bikes from summer 2022. Retrofitting is not possible.
More information at: www.magura.com/ebike-abs-system
Barbara Merz-Weigandt
Editor-in-Chief
