MichaelGot reported.
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This is awesome. I purchased the knuckles on ebay. I'll get bearings and brakes there too likely. Good call on the connector difference, I can get a new pigtail from Rock Auto for 07+. I'm already set on wheels, I'm running 18s from a '13 Z71. The only unknown at this point is a brake line adapter, but I think I can work that.
I finally got everything installed and swapped over on my truck
It is still up on the lift, but I have run into the strangest issue
The front calipers spun completely free at first and everything seemed great
Now the two sides alternate building pressure and locking up after releasing the brake pedal
We are COMPLETELY stumped and it is wicked demoralizing
I have 05 Astro brake hoses and Calipers
Could it be some issue inside the Kelsey Hayes ABS box?
That's creative. Silly question, are you using new brake hoses? Saw that once before on a 1-ton. Acted like a caliper locked up, replaced it, same thing with the new caliper. Pressure would go into the calipers when you hit the brakes, but the hoses would collapse inside when you let off the pedal (like a check valve). You could literally mash the brakes harder, but still would not relieve pressure. It also exhibited that uneven side-to-side behavior - just an idea!
I know those Kelsey-Hayes ABS boxes can give you spongy brakes, but I don't think they can give you the behavior your seeing.
My thought process is leading me towards the ABS unit having something gummed up and needs to be run with the fancy scan tool OR the combination of AC Delco GMT400 master cylinder with Rock Auto vacuum booster has something out of whack.
I bled the Kelsey Hayes unit as much as possible with the port under the black cap too
Worth a shot. The truck is still on the lift. I have not even put it in gear since starting this upgrade conversion 8 months agoWhat if you just pull out the ABS fuse? That will rule out the EBCM I'm pretty sure. I don't think it would be problem though, but simple enough to try.