Hey all,

1998 GS-R w/ ABS.

About a month ago I noticed my pedal sinking to the floor with average pressure. The general concensus was that the Master Cylinder was going. So I replaced it today with a NEW aftermarket MC. Bench Bled the MC first (with a kit), then placed it on the car and bled the lines clockwise starting from Front Left. As stated in a post on toronto integras. (I'm thinking it's wrong now, but still not a big deal)

Now the pedal doesn't sink to the floor when the car is off, and actually it was really stiff as I was bleeding the last corner. However, when the car is on, the pedal becomes soft and will go all the way to the floor again just like before (w/ average braking pressure).

At this point I'm assuming the brake booster or something around that area is the problem, but I really am not sure how to troubleshoot it. The car has ABS, and I don't know if I'm supposed to bleed that or ??

I just did brake booster tests based on this post on honda-tech

https://honda-tech.com/zerothread?id=1261970

and everything passed no problem.. I'm totally at a lose here now.

Any tips to help me troubleshoot this problem would be appreciated.

Thanks.

 

Bump I'm in the same situation too if someone could help, thanks.