Brake Force Distribution (Brake Bias)

Front brakes do most of the work. EBD adjusts distribution electronically. Load affects ideal bias. Electronic brake force distribution uses the ABS valves to adjust rear pressure according to load and deceleration. Older cars used mechanical proportioning valves, sometimes load-sensing ones linked to the rear axle. Under hard braking, weight transfers forward, which is why front brakes are larger.

Pressure is limited at the rear to prevent locking.

Wrong bias causes instability. Faults show ABS warnings.