I am living the same nightmare this year!
I put the Tie Down G5 brakes which were greatly improved over their former brake systems for saltwater. They had Stainless Steel rotors, aluminum calipers with stainless steel pins and bronze bushings.
The first year, they did great! But after the first year, I noticed the pads were completely worn down. I put less than 500 miles on per year.
I discovered that the slider pins were frozen due to the aluminum calipers corrosion was bad enough to swell up the hole where the slider pin rides, causing the pads to drag on the rotors.
I also noticed that the rubber boot around the piston on the caliper is disintigrating.
I have to have brakes in working order on both axles due to the near 10K load I am towing. My V10 Excursion has a tough enough time stopping itself, much less this extra load!
So, I am going to bite the bullet this year and slurge for the best out there….the Kodiak full Stainless Steel kit. It has SS rotor, SS calipers, brackets, etc. They have a 6 year warranty so if I get 6 years out of them, I will be very happy.
The other issue I am having, that I can't seem to solve is the grease slinging past the seals. I put new spindles, seals, repacked bearings and it is still slinging grease. This time, only on the rear axle which is weird. I wiped up the slung grease from the rotors and axle, took out some grease thinking it was pushing out due to expansion, but travelling 160 miles down to the coast today, I have grease all over the rotors again on this same axle.
I carefully checked the seal connection on the spindles when I put this all together new and they had good contact. So not sure why the grease is pushing out! That has to be solved before even the Kodiak's go on.
I can't seem to find anyone that knows the cause to this. I am now strongly considering switching over to the oil bath system. I have used it in the past with good success on a former trailer. I never had oil slinging out of the hubs like I am having with this grease deal.
Tie down has been good to me replacing the pads per their 3 year wear warranty, but they are going to find more issues coming soon from others that find this issue with corroding aluminum calipers. The write up on Kodiak's design is superior, just have to pay the price! They also claim 40% stronger braking pressure on the rotors over the competition which sounds great to me!