I LOVE SS Braided Lines...here is a underbelly photo of a one off system I built and installed. It took a lot longer than I want to share but now that I taught myself how to make my lines...want to SS BRAID the entire truck LOL. It has crossed my mind to every brake line on the truck from master back ; )
Making hydraulic hoses was my job at The Bus Plant for about a year. Best I can figure, I made about 20,000 hoses, more-or-less. Most of them fabric braid over steel-reinforced rubber, (Aeroquip FC300 and Aeroquip FC350) but plenty of single- (Aeroquip 2807) and double-steel-braid (Aeroquip 2808) hoses over Teflon (PTFE) liners like your brake hoses.
Replacing metal tubing brake plumbing with "steel braided" hose is insane.
Metal tubing weighs less, costs less, has a longer service life, is more resistant to road debris, and is less-likely to be damaged by failure-to-properly-secure.
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What happens when those filters get damaged by contact with the ground? Doesn't look like they're protected by being above the frame-rail aside from a thin-steel guard attached to the frame.
Rotors are are massive and HEAVY!
According to my '97 C/K service manual, they're 3/4 to 1 inch smaller in diameter than the JF9 C3500HD rear rotors, and probably not as wide, either. JF9 rotors = 13.58 diameter, 1.435 thick.
You haven't said which calipers you're using, but the web site brags-up their "ElDorado" calipers which are puny junk for an application like this. The JF9 rear discs use Bendix single-piston calipers, but the service manual doesn't specify how big the piston is.
The issue with mine was keeping them in operating order. I coated everything in anti-seize as far as adjusters and bleeders still ran into issues whenever I needed to work on the system.
1. Anti-seize is an improper "lubricant" for drum brake adjusters. The metal powder in anti-seize is abrasive. No wonder you had problems with them.
2. How are the bleeder screws on wheel cylinders any more prone to corrosion than bleeder screws on calipers?
I wanted to grab a rear from an HD C3500 as they come with discs.
No idea how that fits a non-C3500HD truck. May have been a nightmare. Probably easier to get a disc-swap or an axle-swap from a newer-generation 3500. I don't know how easy it would be to install, but at least the caliper would be supported properly instead of those damned flat-brackets; and the calipers and rotors would have been sized properly for the vehicle.