Brake Master Cylinder problems of the 2017 Jeep Wrangler

Consistently "spongy brakes" having continued decreased stopping ability for 6 months after purchase. On 06/05/2018 had brakes inspected by dealership and told they were fine. On 06/14/2018 vehicle was at a complete stop at drive-thru restaurant with brake pedal completely engaged and vehicle moved and rolled forward into the vehicle in front, causing damage. Unaware of a problem thinking it was driver error even though driver stated "foot was on brake the whole time" the vehicle sustained minimal damage and was continued to be driven. On July 7, 2018, with different driver, brake fully engaged at stop light and on city road and vehicle "rolled forward" and hit vehicle in front. On July 9, 2018 vehicle was delivered to dealership with third driver and brakes failed to stop at stop sign going into traffic on city road with brake being engaged and then going to the "floor" of vehicle. On July 17, 2018 dealership state master cylinder has internal failure and it was ready to be picked up. Upon test driving, brakes continued to "go to the floor" after braking and stopping. Dealership kept vehicle and "found internal leak at the brake master cylinder that leaked into brake booster and hcu not responding and found internal failure int he hcu. Vehicle was picked up August 15, 2018. Vehicle appeared to be operating efficiently; but, seemed to still have "play" in the brakes. Had fourth driver test drive, that is experience in car/motorcycle repair and stated that brakes stopped vehicle; but, when slammed to "lock" they never locked before abs kicked in. All 3 drivers of Jeep noticed brakes starting to develop the same issue as previously experienced. Traded Jeep in on new vehicle as 17 yr. Old driver was main driver on vehicle and felt too dangerous to risk this issue again.