Inherited Brake trouble, need your help.

[DustinU]

Since buying my Blazer I have lived with this issue and the only solution has resulted in a decreased turning radius which is really annoying me and obviously not correct (Longer bump stops on spindles).

Here is a post from the previous owner when he was trying to figure it out:
"Here is the problem. The brakes work fine when I am driving around straight and 90 degree turns. If I turn the wheel completely to one side I immediately lose all breaking ability. Not just a power assist... the pedal will go all the way to the floor and the truck keeps moving. I am guessing the power steering is somehow taking/steeling vacuum pressure out of the booster when i do that? Anyone have any idea what my problem could be?
I can pump the brakes to get them activated a little bit... and after a while it will fill back up. Is it just a bad booster that wont hold pressure unless it is constantly getting vacuum? Throw some ideas at me. "


Any ideas? Of the responses I read the most likely is the master cylinder and prop valve are incorrect... I think they are still the drum setup that were not changed during the disc conversion.

Any help would be appreciated, Thanks!