EBV: electronic brake force distribution by means of a hydraulic ABS device is carried out by distributing the brake force to the rear wheels. Since the EBV control is noticeably more sensitive than the mechanical brake force regulator, it is used with noticeably greater efficiency.
When driving in a straight line, the rear wheel brakes are fully effective. In order to ensure the stability of the vehicle when braking in a corner, the amount of braking force on the rear wheels is reduced. Using the ABS speed sensors, the EBV determines whether the vehicle is moving in a straight line or turning. When cornering, the braking force on the rear wheels is reduced. Thanks to this, the rear wheels maintain maximum lateral stability.
ASR: With the help of electronic wheel slip control, when driving off, the spinning wheel is braked, and the torque is transferred to the other wheel that is not spinning.
Note: The ASR system is often referred to by the English abbreviation BTCS - Brake Traction Control System, i.e. traction control with braking. Ford Fiesta Courier models with ABS are not fitted with traction control.
The electronic system monitors the slip of a spinning wheel 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, in extreme cases even on one wheel.
A self-acting ASR system uses many parts of the ABS system. Electronic traction control works when starting off and is automatically deactivated at speeds above 50 km/h. Such a device does not impair the dynamics of the car and does not reduce the efficiency of handling when starting off.
Handling instructions for ABS/EBV/ASR
A safety switch in the electronic control box ensures that the system shuts itself down in the event of a fault (e.g. broken wire) or at reduced supply voltage (battery voltage is less than 10.5 V), which is determined by the yellow ABS warning lamp on the instrument panel. The EBV system is also switched off at the same time. In this case, the normal braking system remains working. When braking, the car behaves as if there were no ABS system.
Precautions: If the red brake warning light comes on while driving, stop immediately and correct the cause. Causes, for example, may be as follows: too little brake fluid, tightened parking brake. When the EBV fails, the yellow ABS warning light and the red warning light come on at the same time, and the rear wheels may lock up during hard braking.
If the ABS warning light comes on while driving, do the following:
- Stop the car, turn off the engine and start it again.
- Check battery voltage. If it is less than 10.5 V, charge the battery.
Attention: When the ABS warning light comes on at the beginning of the movement and goes out again after a while, this indicates that the battery voltage was initially too low, until it increased while driving due to the operation of the alternator and the charging of the battery.
- Check if the wire terminals on the battery are tightly tightened and if the contact is good.
- Raise and support the car, remove the wheels, check the wires of the wheel speed sensors for integrity and the presence of breaks. Other checks on the ABS/EBV/ASR system are carried out in the workshop. Electronics has the possibility of self-diagnosis, appearing malfunctions are automatically stored in the form of codes that are read in the workshop.
Attention: Before carrying out electric welding, the plug must be removed from the ABS control unit (installation location: on hydraulic device). Remove the plug only when the ignition is switched off. During painting and drying, the control unit must not be heated above 90°C.