So i've replaced my rear trailing arm with a used one due to a worn out rear axle bearing. Car is a 1994 acura integra 4dr ls with abs. The side that was replaced was the passenger rear. During the process of replacement I had to take apart the hose line which I knew caused air to get into that certain line. I've tried bleeding the brakes but it came out to be more worse. I am currently bench bleeding it with a friend helping by stepping on the brakes. I have followed the article on TI just to make sure I'm doing it right. I've done this before and never had a problem like this occur.

- Changed rear trailing arm (had to take apart brake line which caused air to get in the line)
- Bench bleed it a few times.
- First time The peddle would have air and would just drop pretty much by itself
- Second time There was more pressure but I was able to push the peddle down all the way to the floor.

Brakes were working perfectly fine before the trailing arm change so I doubt my Master cylinder or brake booster are done.

 

This is somewhat of a catch all phrase but just keep bleeding the entire system from each side not just the one side you changed. Also how old is your master cylinder? If it is old and you pushed the pedal to the floor you could have forced crud from the bottom of the mc through the seals in the mc inheretly ruining it.