Prius c 2015 c1256&c1391 code

Was pulling out of car park when I noticed abs,traction control, brake light n warning light came up, it went off but came back up as I was driving that when I felt the difference in the brakes it sank more n felt like I was loosing pressure until the pedal bottom out, the brake assembly made more noise than usual, the pulse I felt when I started the vehicle from the brake pedal it not present once the lights or on but when off I feel it,note before I bought this the brake assembly was replaced with a used on could it failed already or could it be the master cylinder need changing or entire assembly again