Electronic Brakeforce Distribution (EBD)

Electronic Brakeforce Distribution (EBD)




EBD is integrated with the ABS system and controls the braking force to the brakes on the rear wheels.
EBD stands for Electronic Brakeforce Distribution. With EBD, the task of the control module is to control the hydraulic pressure in the rear wheel brake circuit (1) if the rear wheels are tending to slip more than the front wheels when braking. This ensures that the car brakes smoothly and safely without ABS coming on.
The control module controls the brake pressure by operating the inlet and outlet valves in the rear wheel brake circuit (1).
The EBD pressure sensor is connected to the master cylinder primary circuit and indicates if the primary circuit is under pressure. EBD can only be used when the EBD pressure sensor (2) is activated. EBD replaces the reducer valve which would otherwise reduce the pressure in the rear wheel brake circuit.
Depending on how much the rear wheels are slipping relative to the front wheels, the brake pressure in the rear wheel circuit will be controlled differently. The control system will try to keep rear wheel slip 0-2% higher than front wheel slip. It can therefore be said to be load-responsive.
Generally speaking, the difference in slip between the rear wheels and front wheels when braking mainly depends on how hard the braking is and how loaded the car is. Hard braking/no load can produce serious slipping, light braking/heavy load may give less slip.
As EBD does not require as much brake fluid as ABS/TRACS, the hydraulic pump is not activated. Fluid returning from the brake circuits is taken up by the low pressure accumulators.