because they are not user friendly to change and work on, plus the holding power on them are marginal at best, to small for a 2500 series truck with a 8.1 liter motor.
It does in massachusetts when they do inspections and you have to be able to rev engine to 1200 rpm and have the ebrake hold.
They work fine on my 04 2500 Avalanche.
They will hold my truck with 7k lbs trailer on a hill.
They also hold truck on flat ground and on the throttle. I've made that mistake several times.
Sounds like something isn't working correctly on your factory stuff, and I doubt those caddy calipers have as much holding power as the factory shoes.
Mine are all factory with 120k miles. Checked them 5k miles ago and still had plenty of life left when I changed rear pads and rotors.
I would imagine all the salt up there would be hell on all the parts.
Are your cables locked up?
Are the inside of the rotor hats rusted badly? Are the shoes worn out? Is everything functioning as it should?
I think the caddy calipers would be a huge reduction in stopping power over the factory Avalanche calipers, from having smaller total piston area and smaller pads.
The 2500 parts are all designed and engineered to work with that truck and what it can tow. Those requirements differ greatly from a 78 Cadillac.
As well, the mounting style and dimensions between the two are completely different. So you would have to adapt the brake line, as well as custom mounts for the caliper.
I have no idea but they may be designed for different thickness rotors as well. So that would mean finding an alternative rotor as well.
