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The toughest part of a pre- 69 conversion is changing out the brake lines from 9mm to 10mm. As for the complete system, there are several solutions out there. If you do a search here on the sight, you will find that everybody swears by the solution they used, and disparages everyone else's.
I used JTO, and have been extremely happy. Man-a-fre has a similar system to JTO, but as I said, read all the threads and then try and find a solution that works for you.
I was actually looking at that set up last night. It does not show a power break booster with that package. Did you put one on your cruiser? If so, what did you use and how difficult was it to set up the brake pedal and firewall modification? I am looking at picking up a set of metal brake lines from cruiser corps 371 to 75 cruiser which I’ve been told will work with this set up. Mine are currently 9 mm which I’ve been told I need 10 mm For the system to function properly.
There are several ways to deal with the rib. However, as mentioned before, a spacer is the easiest, though just cutting a portion of the rib can also work. If you do both front and rear, and use an FJ80 (92-93) master cylinder, you do not need a proportioning valve. As for boosters, the OEM booster from a 74 is still available. That is what I used. It is smaller than most of the other solutions, and does an excellent job. Of all the things I have done to my 69, the disc brake conversion is by far the best.
@Rigger, jumping here to thank you for the great posts. Similar to the OP, I just got a 71 and want to do a 4 wheel disk conversion. I've got a LOT of reading to do, and a lot of planning and purchasing ahead of me.
Not trying to hijack, so if anyone wants me to start a new thread LMK. But, is it necessary to swap in a different master cylinder? Or can the original one in my 71 be used and just add an aftermarket proportioning valve?