Bosch ABS BAS3311 / BAS3321, ABS Pro BAS3511 / BAS3521 Manual

Product Description and Specifications

Intended Use

The Bosch eBike ABS (ABS = Anti-lock Braking System) from the system generation the smart system helps riders to slow down in a more controlled and stable manner and makes cycling safer. During hard braking maneuvres, the braking pressure of the front brake is controlled and therefore stabilizes the riding situation. The ABS must not be modified or removed.

Product features

Individual illustrations in these operating instructions may differ slightly from the actual conditions depending on the equipment of your eBike.

1. ABS control unit
2. Operating unit with ABS indicator light
3. Front wheel brake lever
4. Brake caliper
5. Wheel speed sensor^a)
6. Sensor disc

^a) The attachment position may vary depending on the eBike 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 the tendency of the front wheel to block and stop turning. The ABS decreases the braking pressure and thereby stabilizes the eBike. The detection is based either on wheel speed sensors on the front and rear wheels, or on a wheel speed sensor on the front wheel and an inertial sensor system in the drive unit.

Once the eBike has been stabilized, precise increases in braking pressure bring the front 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 front wheel is tending to lock again, the pressure is reduced as before. This process is repeated in order to keep the front wheel at the grip limit at all times and therefore optimise exploitation of the coefficient of friction between the tyres and the ground.

A certain degree of pulsing or vibrating in the brake lever is considered normal and can be expected during operation of the ABS system.
The ABS function is ended when one of the following happens:

• The hydraulic accumulator in the ABS control unit is full.
• The eBike comes to a stop.
• The rider releases the brake.

Due to the way the system operates, the ABS can only step in from a minimum speed of 5 km/h.
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 maneuvres.
For ABS Pro in the Race application, the detection of the rear wheel lifting off the ground is not available during heavy braking.
However, the rear wheel lifting off the ground can be used for various sporty cycling maneuvres, if required.

Fitting

The anti-lock braking system is fully assembled by the manufacturer and must not be modified.

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.

Note: You can change the ABS function in the eBike settings: Select the application you require or switch off the ABS function if necessary.

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 on. You can find more information about this in the section entitled (see "ABS indicator light").

Please check the condition and roadworthiness of the eBike before every journey. It is the eBike rider's responsibility to check the eBike is in perfect working order and fully roadworthy before every journey. Using the eBike with known faults increases the risk of injury to the rider. 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.
Check the ABS control unit is fitted securely to the fork.

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.
The braking power can change over time and a running-in period may be necessary when the brakes are new or when the brake pads have been replaced. For more information about the braking system, refer to the brake manufacturer's instruction manual.

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 eBike and must go out again once you start riding at a speed of approx. 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 ABS or there is a shutdown of the ABS functionality indicated by the user. If a display or on-board computer is connected, you will also be shown an error code on this. You can also view a saved error code on the eBike Flow app. This means the ABS is no longer active. The brake system will continue working, simply without the control provided by the ABS.

• 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 ABS is working.

• 
  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 a wheel is turning for an unusually long period without making contact with the ground (assembly stands). This will switch the ABS off. To re-enable the ABS, stop the eBike and restart it (switch it off and on again).

• 
  faults with the ABS cannot be signalled if the ABS indicator light is defective.
  When starting the eBike, the rider must therefore check to ensure that the ABS indicator light is lit; otherwise the eBike will indicate a critical error by flashing red on the operating unit. Contact a dealer if this happens.

Riding with the battery drained

If the eBike battery's state of charge falls below a defined threshold, the system will disable drive assistance first. The eBike (including display and/or operating unit, light and ABS) will nevertheless remain enabled until the eBike battery's reserve has been used up too. The eBike – and therefore the ABS – will not switch off until the eBike battery is almost completely drained.
The indicator light will come on again for approximately five seconds before the system switches off completely.
From this point onwards, the ABS indicator light will remain off despite ABS control being unavailable. If the eBike is not fitted with a battery or the eBike battery is drained, ABS is disabled.
The brake system will continue working, simply without the control provided by the ABS.
You will need to charge the eBike battery before you can reenable your eBike and the ABS function.

• 
  ABS will be disabled without a power supply!
  If the power fails, the battery is drained or the eBike battery is not fitted, the ABS will be disabled and the ABS indicator light will not come on.

Maintenance and servicing

Maintenance and cleaning

• Servicing and repairs must only be carried out by professionals. Defective parts must always be replaced with original parts.

Have your eBike 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.
Do not immerse any components, including the drive unit, in water or clean them with pressurised water.

After-sales service and advice on using products

If you have any questions about the eBike and its components, contact an authorised bicycle dealer.
For contact details of authorised bike dealerships, please visit www.bosch-ebike.com.

Further information on the eBike components and their functions can be found in the Bosch eBike Help Center.

Safety instructions

General safety instructions

Read all the safety and general instructions. Failure to observe the safety and general instructions may result in electric shock, fire and/or serious injury.

Save all safety warnings and instructions for future reference.

The term eBike battery is used in these instructions to mean all original Bosch eBike rechargeable battery packs from the system generation the smart system.
The term ABS is used in these instructions to mean all original Bosch eBike anti-blocking systems from the system generation the smart system.

• The ABS function/usefulness will be significantly impaired if the ABS setting on the eBike is changed from the setting it was delivered with. Impaired performance will significantly increase the risk of injury to the rider and/or damage to the eBike.
• Read and observe all the safety warnings and directions contained in these operating instructions and in the operating instructions of your eBike and the brake manufacturer.

The safety information in these operating instructions is divided into the following categories:

• 
  – Danger with a moderate degree of risk. Failure to observe this instruction may result in death or serious injury.
• 
  – 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.

General Safety Instructions for the ABS

• Tampering with the system components is not permitted under any circumstances. The rider must adapt their riding style to the environmental conditions (e.g. available 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 tip over, is not recommended.
• 
  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. Servicing and repairs must always be carried out by authorised specialists. Defective parts must always be replaced with original parts.
• 
  only use the brake fluid specified by the relevant brake manufacturer
  Only the brake fluid intended for the respective foundation brake and specified by the relevant brake manufacturer 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. Servicing and repairs must always be carried out by authorised specialists.
• 
  only 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 and braking distance will increase. Servicing and repairs must always be carried out by authorised specialists.
• 
  size of brake discs can only be modified after approval by the eBike manufacturer The size of the brake disc on the front wheel can only be modified from the eBike's original equipment by a specialist retailer. The specialist retailer must obtain consent from the eBike manufacturer and an updated software configuration of the ABS. If the size of the brake disc is modified independently, this will prevent the ABS from working correctly. There is a greater risk of falling over.
• 
  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. Servicing and repairs must always be carried out by authorised specialists.
• 
  specific ABS applications for specific applications
  To cover the applications of ABS, there are four different applications available: Touring, Allroad, Trail and CargoLJ. The four applications are configured differently and must not be modified. The Allroad and Trail applications give riders the option of switching off the ABS (off mode) because they are not approved for challenging braking conditions. 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.
• 
  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.
• 
  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.
• 
  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.
• 
  braking around corners
  The ABS is a safety system that reduces the risk of the wheels locking. There is an inherently greater risk of falling when braking around corners. The rider is always responsible for adapting their riding style to the situation on the road.
• 
  ABS intervention is limited.
  In extreme riding situations, the ABS may not be able to control the eBike all the way through 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.
• 
  eBike pitchover
  The ABS is not always able to prevent the eBike pitching over in extreme riding situations (e.g. when carrying a heavy bag with a high centre of gravity or the eBike having a high centre of gravity, e.g. due to the saddle being set high as a result of a small frame, or variations in the road surface or steep descents). Always adapt your riding style to the present environmental conditions and your personal cycling abilities.
• 
  air in the hydraulic system
  If air gets into the brake system, the function and usefulness of the ABS is significantly impaired. 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 to fingers that 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 pressure point and whether there is sufficient clearance between the brake lever and the handlebar grip. The pressure point 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.
• 
  check the ABS control unit
  Before every journey, check that the ABS control unit is fitted securely to the fork. If the ABS control unit comes loose, it may fall into the spokes and cause an accident.
• 
  limited function during software updates
  The ABS may be deactivated and there may be no indication from the ABS indicator light during software updates. We do not recommend riding your eBike during software updates.
• 
  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.

Special Safety Instructions for the Product

• 
  specific ABS Pro applications for specific applications
  To cover the applications of ABS Pro, the following applications are available: Trail Pro and Race. The applications are configured differently. In the Race application, the rear wheel lifting control is deactivated. The applications can be switched off if required (off mode). 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.
• 
  the ABS Pro control system is limited
  The ABS Pro is configured to prevent an initial overbraking of the front wheel, but it is not intended for assisting braking until the eBike comes 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.

Privacy notice
When you connect the eBike to the Bosch DiagnosticTool 3 or replace eBike components, technical information about your eBike (e.g. manufacturer, model, bike ID, configuration data) and the eBike usage (e.g. total riding time, energy consumption, temperature) is transferred to Bosch eBike Systems (Robert Bosch GmbH) for the purposes of processing your inquiry, servicing and product improvement. You can find further information about data processing at www.bosch-ebike.com/privacy-full.

Subject to change without notice.

Robert Bosch GmbH
72757 Reutlingen
Germany
www.bosch-ebike.com

Documents / Resources

References

• Premium eBike systems and smart functions
• General Data Protection

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