an adaptation to a vehicle antilock braking system modulator to increase the initial displacement of the master cylinder , provide quicker system response and improved pedal feel . a solenoid assembly is added to the non fluid side of each of the low pressure accumulators in the abs modulator . upon the operator initiation of a brake apply , the solenoids are energized to immediately push upon the sump pistons and inject fluid from the low pressure accumulators into the brake system . this extra “ shot ” of fluid decreases the amount of fluid that the master cylinder delivers to the brake system . this improves pedal feel as it reduces the required initial pedal travel for a given brake system displacement . the low pressure accumulator pistons are spring balanced to ensure retention of fluid between brake applies and to allow normal abs operation . during abs operation , the low pressure accumulator displacer solenoids are de - energized to allow effective operation . the holding force of the displacer solenoids can be reduced by using a toggle linkage apply mechanism .