Not sure which bracket you're referring to. Flexible brake line from caliper to mounting block came with my donor IRS. Just ran hard lines up to the mounting block which I fastened to frame. I installed a prop. valve but can't really comment on brakes yet since I've only drove around the block in the gocart stage. I did the brake pedal arm mod. with standard IRS and Mustang calipers & rotors w/ a 1981 Mustang MC. Have a nice firm pedal with little travel but haven't tried locking them up to test them out though.
I used Mike MAck's (TriStates) pre-bent rear brake line, which includes the stainless steel flex lines for each caliper, the connecting hard line and a block to tie into with your hard line from the M/C. There're some pics of it on the Phoenix build site, if that's any help. Good luck!
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