Pressure is generated by a hydraulic pump and managed by an ERS brake pressure reducing valve mounted near the rear of the car on the pipework that would normally feed the brake fluid to the rear calipers. In short, the additional braking capacity of the MGU-K produced by the reverse torque effect on the drive shaft (in order to recover a certain amount of energy) will be compensated, in a split second, by bleeding excess hydraulic fluid back to the fluid tank which will subsequently decrease the amount of pressure applied to the rear calipers, thus appropriately balancing the conventional brakes with the ERS braking.