55 disc brakes
 

Helping a friend who has a 55 chiefton and wants to convert to front disc brakes, keep the 5x5 bolt pattern and if I recall someone on this did it with over the counter full size GM parts with the original spindle, or is there a company that he can order from with everything including upgraded master, proportion valve and everything else

Have him look here: https://scarebird.com/index.php?rout...tegory&path=63

There is this complete kit on Ebay. My '56 came with a similar set that I sold.

https://www.ebay.com/itm/33060633849...mis&media=COPY