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Something seems amiss with the master cylinder not allowing the pressure off the system when you let go of the lever. That's where I would start looking.
That's pretty much what I have seen a few times with guys rebuilding master . They put plunger in the way it looks to go....but it's upside down. Not the first time I have seen it
Food for thought. Spin your front wheel to see that it's free. Apply the brake ( lever ) and release. If the wheel is bound, crack the bleeder valve. If a "squirt", not a dribble of fluid comes out, you have a ( likely ) problem the master. Residual pressure ( commonly used in drum brake systems to overcome the tension on the brake return springs ) should not be present. If there isn't any "residual pressure" and the wheel still doesn't spin freely then check to see if the caliper pistons are bound. Simply use a lever to gently pry the pistons back. If doing this allows the wheel to spin freely there is a problem with the caliper pistons not releasing ( the square cut seal in the piston bore is what "pulls" the piston back in by "flexing" after the brakes are released ). Hope this helps.
What Brembo calipers do you have? HD's or real Brembos? I dont think the HD Brembos can be used on a stock 07 fork and rotor, if I remember right that year the rotors were larger and had a different bolt pattern. Maybe that was 09 not sure.
I put real Brembos on my 07 before HD had theirs, the directions were real specific, you had to shim the caliper so the rotor was near centered between the pads or they will drag and hang up. Even if you used HD calipers did you check the alignment at install?
Your rotors are not turnable, my guess without seeing it is they are toast, and Im sure the caliper seals are gone too with the sight of glowing rotors with flames.
I have 08+ master cylinder, new lines, Harley OE Brembo calipers(albeit used), Galfer rotors(for the V-rod which coincide with the Harley Road Winder wheels), and Lyndall Z-Plus pads. Zero mismatch here.
Pulled it all apart and........
It looks like the ride side stuck a piston, fluid heated up, expanded, and started clamping down all the pads. Right side pads were down to 6.67mm from a stock width of 7mm, left side were both at 6.97mm, it's apparent which side had a problem. Went ahead and pulled apart the calipers and despite anything that happened all seals were pliable and in good shape, nothing got hot enough to melt rubber.
I ordered new rotors, pads, and seal kits for the calipers to go through it all while I'm there.
All back together and the stuck piston was part of the problem, the other part is Harley's great diagram and my memory from the months ago when I took the master cylinder apart.
Hop on the road, brake a couple times, and they start clamping down again. I haul it over, bleed some pressure, and buzz it back home. Luckily they didn't burn and they are definitely bedded in lol.
So with everything new I had a different problem that diagnosed as the master cylinder sticking and holding pressure. I did have a moment when reassembling it that I wasn't sure about the small push rod that the lever actuates, it has a big end and a small end. Don't put the big end in, it goes to the lever side. The big end is just big enough to hold pressure on the master cylinder, flipped it around and took it for another ride, nothing happened except normal braking albeit a little spongy as I didn't refill and bleed after but I'll take care of that today.
If anyone has to delve into these new Brembo calipers they are easy. I also ordered Drag Specialties #1702-0125 off eBay for $15(need two if rebuilding both) for the o-rings, drop right in and work fine.
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