Sinking/Spongy Brake Pedal,Got a used abs pump to fix it

Sinking/Spongy Brake Pedal???? With ABS SYSTEM!!...Watch this before you buy a master cylinder!!...It does happen...Its Not always a Master Cylinder Issue! ...Must Watch! https://youtu.be/ceN0a-nPUZw You can use this way to fix car,that many DIY car guys tested it with their car model. I have collected those tested models,Please check below. 2005 GMC Sierra,MINI Cooper,2008 ranger,chevy…