EBV: Electronic brake force distribution via the hydraulic ABS distributes the brake force to the rear wheels. Since the control via the EBV is significantly more sensitive than the mechanical brake force regulator, it is used with significantly greater efficiency.
When driving in a straight line, the rear brakes are applied with full force. In order to ensure vehicle stability when braking in a turn, the proportion of braking force on the rear wheels is reduced. Using the ABS speed sensors, the EBV unit determines whether the vehicle is driving in a straight line or turning. When driving in a turn, the braking force on the rear wheels is reduced. This ensures that the rear wheels maintain maximum lateral stability.
ASR: With the help of electronic control of the slip of the drive wheels, when starting off, the slipping wheel is braked and the torque is transferred to the other wheel that is not slipping.
Note: The ASR system is often referred to by the English abbreviation BTCS - Brake Traction Control System, i.e. traction control using braking. Ford Fiesta Courier models with ABS do not have a traction control system.
The electronic system monitors the slippage of the wheel that is prone to spinning and reacts immediately by connecting and modulating the brake pressure of the corresponding wheel. This ensures that maximum traction is always achieved on the drive wheels, or even on one wheel in extreme cases.
The ASR system, which works independently, uses many of the ABS components. Electronic traction control works when starting off, and it automatically switches off at speeds exceeding 50 km/h. This device does not impair the vehicle's dynamics or reduce the efficiency of control when starting off.
ABS/EBV/ASR Handling Guidelines
A safety switch in the electronic control unit ensures that the system switches off automatically in the event of a fault (for example, a broken wire) or at low supply voltage (battery voltage is less than 10.5 V), which is determined by the yellow ABS indicator light on the instrument panel. The EBV system is also switched off at the same time. The normal braking system remains in operation. When braking, the car behaves as if there was no ABS system.
Precautions: If the red brake system indicator light comes on while driving, you must stop immediately and eliminate the cause. The reasons may be, for example, the following: too little brake fluid, the parking brake is applied. If the EBV fails, the yellow ABS indicator light and the red indicator light come on simultaneously - in this case, the rear wheels may lock up during sudden braking.
If the ABS warning light comes on while driving, you need to do the following:
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- Stop the car, turn off the engine and start it again.
- Check the battery voltage. If it is less than 10.5 V, charge the battery.
Caution: When the ABS warning lamp comes on at the start of driving and goes out again after a while, this indicates that the battery voltage was initially too low until it increased during driving due to the generator running and battery charging.
- Check that the battery terminals are tightly tightened and that there is good contact.
- Raise and support the car, remove the wheels, check the wires of the wheel speed sensors for integrity and breaks. Other checks of the ABS/EBV/ASR system are performed in the workshop. The electronics have the ability to self-diagnose, the malfunctions that appear are automatically stored in the form of codes that are read in the workshop.
Caution: Before performing electric welding work, remove the plug from the ABS control unit (installation location: on hydraulic device). Remove the plug only when the ignition is switched off. When painting and drying, the control unit must not heat up above 90°C.