S60 2.4 L5-2.4L VIN 61 B5244S (2001)
Electronic Brake Control Module: Description and Operation
Electronic Brake Force Distribution (EBD)
Electronic Brake Force Distribution (EBD)
Electronic brake force distribution (EBD) is integrated in the ABS system and controls the braking forces to the rear wheel brakes. The electronic
brake force distribution (EBD) function replaces the relief valve which otherwise reduces the pressure in the brake circuit for the rear wheels.
Electronic brake force distribution controls the hydraulic pressure in the brake circuit for the rear wheels the rear wheels slip considerably less than
the front wheels under braking. This ensures optimal and stable braking.
The ABS control module regulates the brake pressure by controlling the inlet and outlet valves in the rear wheel brake circuits.
The electronic brake force distribution (EBD) pressure switch is connected to the primary circuit of the master cylinder and transmits signals that
the primary circuit is pressurized. Electronic brake force distribution (EBD) is only available when the pressure switch is activated.
The brake pressure in the rear wheel circuits varies, depending on how much the rear wheels slip in relation to the front wheels. The purpose of the
control is to keep the rear wheel slippage to 0-2% higher than the front wheels. The function is load sensitive.
Generally, the difference between the rear wheel and front wheel slippage under braking is dependent on how hard the brakes are applied and on
the load of the car. Hard braking/light loads cause more slippage, light braking/heavy loads cause less slippage.
Therefore the requirement for brake fluid when the hydraulic pump is not activated during electronic brake force distribution (EBD) control is less
than during stability and traction control. The fluid volume returned from the brake circuits is taken up by the accumulators.
