BOSCH BAS3311 ABS Control Unit Instruction Manual
- June 10, 2024
- Bosch
Table of Contents
BOSCH BAS3311 eBike ABS Instruction Manual
Safety Instructions
General safety instructions
Read all the safety information and in structions. Failure to observe the safety information and follow instructions may result in electric shock, fire and/or serious injury.
Save all safety warnings and instructions for future ref erence.
The term battery is used in these instructions to mean all original Bosch eBike rechargeable battery packs.
- Read and observe the safety warnings and directions contained in all the eBike system operating instructions and in the operating instructions of your eBike.
The safety information in these operating instructions is divided into the following categories:
-
WARNING – Danger with a moderate degree of risk.
Failure to observe this instruction may result in death or serious injury. -
CAUTION – Danger with a low degree of risk.
Failure to observe this instruction may result in minor to moderate injury. -
NOTE – Specific information to improve handling.
This is used in reference to operating instructions, checks, adjustments and maintenance work.
Safety information for anti-lock braking systems (ABS)
-
Tampering with the system components is not permit ted under any circumstances. The rider must adapt their riding style to the environmental conditions (e.g. the coefficient of friction between the tyres and the ground, steep inclines, weather, additional loads, etc.). Carrying an additional load that changes the vehicle’s centre of gravity in any way (e.g. a basket or a child seat on the handlebars), which could increase the tendency to pitch over, is not recommended.
-
WARNING – tampering with components of the ABS will prevent it from working correctly.
If any components of the braking system or the ABS are tampered with, modified, or replaced with unauthorised components, this may prevent the ABS from working as it should. Correct operation cannot be guaranteed and there is a greater risk of falling over. Servicing and repairs must only be carried out by professionals. Defective parts must always be replaced with original parts. -
WARNING – exclusively use the original brake fluid.
Only the original brake fluid intended for the respective foundation brake may ever be used as brake fluid. If another brake fluid is used, correct operation cannot be guaranteed and there is a greater risk of falling over. Servicing and repairs must only be carried out by professionals. -
WARNING – exclusively use the original brake pads.
Only the original brake pads intended for the respective foundation brake may ever be used as brake pads. If another brake pad is used, correct operation cannot be guaranteed and there is a greater risk of falling over. Servicing and repairs must only be carried out by professionals. -
WARNING – size of brake discs can only be modified after approval by the bicycle manufacturer.
The size of the brake disc on the front wheel can only be modified from the bicycle’s original equipment by a specialist retailer. The specialist retailer must obtain consent from the bicycle manufacturer and an updated software configuration of the ABS. If the size of the brake disc is modified independently, this will prevent it from working correctly. There is a greater risk of falling over. -
WARNING – ensure the minimum tread depth of the tyre.
Only the tyres intended for the respective bicycle category may ever be used as tyres. If another tyre is used or the tyre tread depth is less than 1 mm for cycling on the road or 2 mm for cycling off-road, correct operation cannot be guaranteed. There is a greater risk of falling over. Servicing and repairs must only be carried out by professionals. -
WARNING – specific ABS applications for specific ap plications
To cover the applications of ABS, there are 4 different applications available: Touring, Allroad, Trail and CargoLJ. The 4 applications are configured differently and must not be modified. The Allroad and Trail applications give the rider the option of switching off the ABS (off mode) because they are not approved for challenging braking conditions, such as on technical trails. Always adapt your riding style to the present environmental conditions and your personal cycling abilities and also wear appropriate personal protective equipment for the application. -
WARNING – ability to switch off the ABS
If the safety features have been deactivated (the ABS is in off mode), the ABS will not intervene to control the brake, i.e. the bicycle will have the braking behaviour of a normal brake system without ABS. If the brake is operated too strongly, it could cause the front wheel to lock or the rear wheel to lift, and also a potential pitchover. Always adapt your riding style to the present environmental conditions and your personal cycling abilities. -
WARNING – ABS increases braking distance.
The ABS prevents the front wheel from locking. This significantly improves rider safety by reducing the risk of skidding on low-friction surfaces and pitching over on high-friction surfaces. In some situations, however, system intervention may increase your braking distance. Always adapt your riding style to the present environmental conditions and your personal cycling abilities. -
WARNING – reckless riding
The presence of the ABS does not absolve the rider of the need to exercise due caution. The system is primarily designed to provide an additional safeguard in emergency situations. The rider is always responsible for adapting their riding style to the situation on the road. -
WARNING – braking around corners
The ABS is a safety system that reduces the risk of the wheels locking when braking in a straight line with no lateral forces acting on the vehicle. There is an inherently greater risk of falling over when braking around corners. The rider is always responsible for adapting their riding style to the situation on the road. -
WARNING – ABS intervention is limited.
In extreme riding situations, the ABS may not be able to control the bicycle all the way through to the wheel coming to a complete stop. The ABS function can be re-enabled for braking by briefly releasing the front-wheel brake. Always adapt your riding style to the present environmental conditions and your personal cycling abilities. -
WARNING – eBike pitchover
The ABS is not always able to prevent the vehicle pitching over in extreme riding situations (e.g. when carrying a heavy bag with a high centre of gravity or the vehicle having a high centre of gravity, e.g. due to the saddle being set high or variations in the road surface or steep descents). Always adapt your riding style to the present environmental conditions and your personal cycling abilities. -
WARNING – air in the hydraulic system
The air in the system means that less braking force can be built up, especially following intervention by the ABS, in which the brake lever also moves a little closer to the handlebars. There is an additional risk of crushing fingers which are not wrapped around the brake lever and remain on the handle while braking.
Before every journey, you should therefore apply the brake to check whether there is a clearly noticeable centre of pressure and whether there is sufficient clearance between the brake lever and the handlebar grip. The centre of pressure should be at approximately 1/3 of the brake lever travel. In case of doubt, set the brake lever to the maximum possible length of travel. If air finds its way into the brake system, please have it bled by a professional. Always adapt your riding style to the present environmental conditions and your personal cycling abilities. -
WARNING – check the ABS control unit.
Check that the ABS control unit is fitted securely to the fork at regular intervals. If the ABS control unit comes loose, it may fall into the spokes and cause an accident. -
CAUTION – damage to components or risk of crushing
Take care not to trap components such as brake lines, cable harnesses or parts of the body between the ABS control unit and the frame. This will help prevent damage to components and bodily injury, even in the event of the handlebars fully locking. -
NOTE – do not allow brake fluid to come into contact with the control unit.
When servicing the ABS, make sure that the ABS control unit does not come into contact with brake fluid. If the ABS control unit comes into contact with brake fluid, correct operation over the entire service life cannot be guaranteed. In such cases, clean the ABS control unit of the brake fluid as quickly as possible. Servicing and repairs must only be carried out by professionals.
Privacy notice
When you connect the eBike to the Bosch Dia gnosticTool 3, data about the eBike ABS (e.g. braking force, delay, etc.) is transferred to Bosch eBike Systems (Robert Bosch GmbH) for the purposes of product improvement. You can find more information about this on the Bosch eBike website at www.bosch- ebike.com.
Product Description and Specifications
Intended Use
The Bosch eBike ABS (ABS = A nti- B locking S ystem) helps the rider to slow down in a more controlled and stable manner, even in hard conditions. Thanks to the combination of the front wheel ABS and the rear wheel lifting control, the ABS makes cycling safer. During hard braking manoeuvres, the braking pressure of the front brake is controlled and therefore stabilises the riding situation. The ABS must not be altered or removed.
Product features
The numbering of the components shown refers to the illustrations on the graphics pages at the beginning of the manual.
Individual illustrations in these operating instructions may differ slightly from the actual conditions depending on the equipment of your eBike.
- ABS control unit
- Operating unit with ABS indicator light
- Front wheel brake lever
- Brake caliper
- Wheel speed sensora)
- Sensor disc
a) The attachment position may vary depending on the wheel manufacturer.
Technical data
Note: For a description of the brakes and how they function, please refer to the instructions provided by the brake manufacturer.
How it Works
When the front-wheel brake is operated, the ABS function identifies critical slippage using the wheel speed sensors on the front and rear wheels and limits slippage by reducing the braking pressure and thereby stabilising the wheel.
Once the wheel has been stabilised, precise increases in pressure bring the wheel back up to the locking limit. This causes the lever to move a small distance towards the handlebars with every braking impulse. If the wheel is tending to lock again, the pressure is reduced as before. This process is repeated in order to keep the wheel at the grip limit at all times and therefore optimise exploitation of the coefficient of friction between the tyres and the ground.
The ABS function is ended when one of the following happens:
- The memory of the ABS control unit is full.
- The eBike comes to a stop.
- The rider releases the brake.
In addition to the ABS function, a system has been integrated that detects when the rear wheel lifts off the ground during heavy braking. This means that, within certain limits, forward pitchover can be counteracted during very hard braking manoeuvres.
Fitting
The anti-lock braking system is fully assembled by the manufacturer and must not be modified.
Warning! If you would like to attach other accessories to the handlebars, bear in mind that the handlebars must be able to turn freely at least 60° to either side from the centre position. Steering limiters may need to be fitted.
Operation
- It is not permitted to attach additional holders to the fork, e.g. for panniers, in conjunction with an ABS.
Before every journey
Check to ensure that the ABS indicator light is working correctly on the display and/or operating unit whenever you switch the eBike system on. You can find more information about this in the section entitled (see “ABS indicator light”, page English – 3).
Please check the condition and roadworthiness of the eBike before every journey. The eBike must be in perfect working order during use.
Always check to ensure that the front- and rear-wheel brakes are working correctly before setting off.
Check to ensure that the thickness of the brake pads and the brake discs meets the manufacturer’s specifications before setting off.
Before the first journey
Familiarise yourself with how the brakes and ABS work and how they respond when you actuate them, for example by practising your braking technique away from busy roads.
Disc brakes need a while to take effect and their braking power increases over time. You should therefore bear in mind that the braking force may increase while braking. This also happens after replacing the brake pads or the disc. For nformation on changing the brake discs and brake pads, as well as what to do when applying the brakes, please refer to the instructions provided by the brake manufacturer.
During the journey
Adapt your riding style to the present riding situation, the road conditions and your cycling abilities.
Please be aware that the ABS may increase your braking distance.
On slippery surfaces, the tyres skid more easily and there is a greater risk of falling over. You should therefore reduce your speed, applying the brakes in good time using a steady pressure.
ABS indicator light
The ABS indicator light must come on after starting the system and must go out again once you start riding at a speed of approximately 5 km/h.
If the indicator light does not go out once you have started riding or comes on while riding, this means that there is a fault with the anti-lock braking system or there is a shutdown of the ABS functionality indicated by the user. If a display is connected, you will also be shown an error code on the display. You can also view a saved error code on the eBike Flow app. This means the anti-lock braking system is no longer active. The brake system will continue working, simply without the control provided by the anti-lock braking system.
- Please make sure you have all repairs carried out by a professional.
The functionality of the rear-wheel brake is not affected by whether or not the anti-lock braking system is working.
- WARNING – ABS indicator lamp lit.
If the ABS indicator lamp is lit, this means that the ABS function is disabled.
Note: The ABS indicator light may come on in extreme riding situations where the front wheel and the rear wheel are turning at very different speeds, for example when riding solely on the rear wheel or if the wheel is turning for an unusually long period without making contact with the ground (assembly stands). This will switch the anti-lock braking system off. To re-enable the anti-lock braking system, stop the eBike and restart it (switch it off and on again).
- CAUTION – Faults with the ABS cannot be signalled if the ABS indicator lamp is defective.
When starting the eBike system, the rider must therefore check to ensure that the ABS indicator light is lit; otherwise the eBike system will indicate a critical error by flashing red on the operating unit. Contact a dealer if this happens.
Riding with the eBike battery drained
If the battery’s state of charge falls below a defined threshold, the system
will disable motor assistance first. The system (including display and/or
operating unit, light and ABS) will nevertheless remain enabled until the
battery’s reserve has been used up too. The eBike system – and therefore the
ABS – will not switch off until the battery is almost completely drained.
The indicator lamp will come on again for approximately five seconds before
the system switches off completely.
From this point onwards, the ABS indicator lamp will remain off despite ABS
control being unavailable. If the eBike is not fitted with a battery or its
battery is drained, ABS is disabled.
The brake system will continue working, simply without the control provided by
the anti-lock braking system.
You will need to charge the battery before you can re-enable your eBike system
and the ABS function.
- WARNING – ABS will be disabled without a power sup ply!
If the power fails, the battery is drained or the battery is not fitted, the ABS will be disabled and the ABS indicator lamp will not come on.
Maintenance and servicing
Maintenance and cleaning
- Servicing and repairs must only be carried out by pro fessionals. Defective parts must always be replaced with original parts.
Have your eBike system checked by an expert at least once a year (including mechanical parts, up-to-dateness of system software).
Please have your eBike serviced and repaired by an authorised bicycle dealer.
After-sales service and advice on using products
If you have any questions about the eBike system and its components, contact
an authorised bicycle dealer.
For contact details of authorised bike dealerships, please visit www.bosch-
ebike.com.
Disposal
The drive unit, on-board computer incl. operating unit, battery, speed sensor, accessories and packaging should be disposed of in an environmentally correct manner.
Check that your personal data has been deleted from the device.
Do not dispose of eBikes and their components with household waste.
In accordance with Directive 2012/19/EU and Directive 2006/66/EC respectively, electronic devices that are no longer usable and defective/drained batteries must be collected separately and recycled in an environmentally friendly manner.
Please return Bosch eBike components that are no longer usable free of charge to an authorised bicycle dealer or to a recycling facility.
Subject to change without notice.
Documents / Resources
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BOSCH BAS3311 ABS Control
Unit
[pdf] Instruction Manual
BAS3311 ABS Control Unit, BAS3311, ABS Control Unit
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References
- Bosch eBike Systems | Premium eBike systems & smart features - Bosch eBike Systems
- Bosch eBike Systems | Premium eBike systems & smart features - Bosch eBike Systems