Rock hard brakes that won't stop the car

[ACUDANUT]

 I am on my second new master cylinder and have bled all four corners.  The rear brakes I had to replace the rubber hose that is also a spliter because it was clogged.  What gives ?

[FLG]

Power or manual?

[Back N Black]

Brake booster or vaccum leak at the booster.

[maxwellwedge]

Sounds like a master that won't bleed properly.

[ACUDANUT]

Power Disc brakes. I was thinking it was the Power booster. But I thought I still should at least have some brakes.

[FLG]

If the mc is good id say booster. Had the same problem with a 67 tbird, it was a bad booster with a ripped diaphram, wouldn't stop unless you put 2 feet on it and enough pressure to throw you in the back seat.

[oldcarnut]

The rear brakes I had to replace the rubber hose that is also a spliter because it was clogged.  What gives ?

Clogged with what?  Or, was the hose swelling up and not letting fluid pass through?  If the hose was clogged up, maybe your distribution or proportion valve are sticking and need cleaning or possibly more trash is in the system  .