kylenautique
I'm Awesome
I tried the NBS MC swap. It doesn't work with JB6 stock brakes. The pedal almost goes to the floor. With the Hydroboost, I'd have to see if the NBS hydroboost MC works, but honestly, the brake performance has been stellar with the stock hydroboost and master cylinder. I deleted the ABS anyways because the unit failed, so running an adjustable proportioning valve was the simple solution for the rear brakes.So I did some research, evidently the gmt400 quick take up master cylinder is designed to be used with rear drum and as such incorporates the function of a residual pressure valve into it. Have you considered using a Gmt800 master cylinder (from the rear disc ones, not the later rear drum ones)
THe pedal feel may improve and it may also help your situation. I guess I could see maybe a sticky piston is somehow contributing to your whine but I doubt it. But consider this suggestion as an offshoot of your whine issue and just based on my preliminary searching.
And did you mean single piston rear gmt800 rear calipers, not 400?
I didnt know the escalade or denali got two piston rears. Is this only in the half tons or does it apply to the 3/4 tons?
Cables worked directly with your parking brake pedal and routed nicely? Nice.
Do you by chance have a dial indicator?