DART - Lighting Busch + Müller - Free user manual and instructions
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USER MANUAL DART Busch + Müller
- Instruction Manual for Busch + Müller E-Bike Rear Light TOPLIGHT Dart E Brex (not allowed on vehicles required to carry licence plates (fast e-bikes))
TOPLIGHT Dart E Brex Type No. 340KSB
This Instruction Manual is intended for users with knowledge and experience in assembling and installing bicycle components. Special tools are required. If you do not know how to assemble or install bicycle components or do not have all the necessary tools for the job, please contact a bicycle specialist to have the installation done properly. Otherwise, the cyclist may fall off and suffer serious injuries as a result of improper assembly or installation of the light components. Read this Instruction Manual carefully, follow all the steps described and keep it in a safe place.
2. Safety information
This Instruction Manual uses the following signal words to alert you to potential hazards. The meaning of the signal words is listed below:
NOTICE Indicates information considered important, but not hazard-related (e.g. information related to property damage).
The symbol is used to provide other useful information about your new bicycle lights.
3. Intended use
Busch + Müller offer a wide range of different bicycle lights. Not every bicycle light can be used for any application and for cycling on any surface. There are limitations. If you are not sure which type of bicycle light you have, either call our service hotline at +49 2354/9157111, send an e-mail to service@bumm.de or consult a local specialist bicycle retailer.
NOTICE Bicycle lights made by Busch + Müller are suitable for use on bicycles cycling on a firm surface. Avoid any extreme use, and never ride down stairs or perform jumps, stunts, tricks, bunny hops or vertical descents on rough terrain.
4. Legal Regulations
Before cycling on public roads, you must learn and observe at any time the applicable national laws and statutes as well as local regulations. For information, either consult the Road Traffic Regulations or - depending on your respective place of residence - other sources for information.
Never cover or conceal your bicycle lights. Always make sure the bicycle lights are correctly adjusted. In general, the prescribed mounting height ranges between about 40 and 120~cm . For details consult the Road Traffic Regulations or contact a local bicycle specialist retailer.
5. Package content
Rear light with assembly bolts | Fastening nuts | Instruction Manual
6. Assembly
Attach the rear light to the rack using the two fastening bolts on the rear and the enclosed fastening material. The rear light is designed for a 50~mm or 80~mm assembly dimension. Tighten the screws only to the extent preventing the rear light from slipping or falling off. BREX works without electrical connection to the brake lever.
Align the rear light so that it is perpendicular to the ground and parallel to the colour track as shown in the sketch opposite. This is absolutely necessary for the correct function of the stoplight!
Important: Lighting equipment must not be concealed at any time.

7. Power supply
Rear light exclusively for connection to a DC voltage source of 6 to 50V (AC DC), e.g. e-bike battery. Connection to an AC voltage source (e.g. dynamo) is not permitted!
Cable with open strands:
- Pull off the attached cable clamp!
- Push the cable with the ends stripped by approx. 5mm through the insertion holes of the cable clamp. Bend the open strands downwards around the cable clamp so that they are fixed and do not touch each other. do not touch each other. Make sure the polarity is correct!
- Insert the cable clamp with the cables into the tail light so that the open strands are guided to the plug contacts of the tail light. The plug contacts of the tail light and fix them there.
Cable with cable lugs:
- Pull off the attached cable clamp 1
- Attach the cable to the plug contacts. Make sure the polarity is correct.
- The cable clamp is no longer needed.
The connection of this rear light is only permitted on vehicles where it is ensured that after the battery has been switched off due to discharge, power is still available to supply the lighting system for at least 2 hours.

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8. Operation
The rear light is switched on and off via the vehicle display or via the headlight. If the speed is reduced significantly, the rear light illuminates much brighter to signalise the following traffic to slow down (stoplight).
In the event of an extreme reduction in speed (emergency braking), a very noticeable flashing of the stoplight warns the traffic behind of an abrupt braking manoeuvre (emergency stoplight function). This increases protection against rear-end collisions and can prevent accidents when cycling in convoys and with children!
Correct alignment of the rear light is a prerequisite for the proper functioning of the brake and emergency stoplight function (see: 6. Assembly).
9. Further remarks
If the bike is splashed with water, parked upside down in the rain or transported on a car in the rain, seal the rear light (e. g. with plastic bags) to prevent moisture from entering the rear light.
Disposal: Rear lights with electronic components must not be handled as household waste but are to be disposed of as hazardous waste.
10. Liability
In addition to the above-mentioned exclusions of warranty, we do not assume liability for any and all other damage caused by improper handling (e.g. dropping the headlight, inadequate safety of mounting and its consequences, submersion in water or other liquids etc.). Neither do we assume any liability if the rear light is opened or dismantled.
Have fun and enjoy safe cycling with your new rear light.
Technical modifications reserved.
Busch + Müller KG • 58540 Meinerzhagen, Germany • Tel. +49 2354 915-6000 • info@bumm.de • www.bumm.de