Hi,
I have a 1989 K1500, 8.5in corp 10 bolt, from factory the brakes were garbage and I have since put the 2500 front calipers on up front, hydroboost, and years ago a rear disc conversion- this kit takes 1988 light duty front rotors and the D154 GM caliper, cheap and from many years of cars, currently using 1994 S10 calipers. I never could get Eldorado calipers to work properly so I have a transfer case mounted driveline safety brake. Anyway, from day one the pass side wasn't square, I suppose since the bracket is a two piece welded unit- the welding may have warped it- I don't know, I do know that the pads wear into wedges- sure I could take a sledge to it.....
So I've been looking around and have seen some high dollar kits and ran across John here and his kits look to be high quality, BUT he only makes them for 67-87 GM trucks, as per his email below I'm looking for some interest in a reasonably price kit- I've also been looking at Wilwood D154 replacements and dual piston calipers, aluminum and SS pistons- not a bad price too, but I have in mind 98-04 S10 front dual piston caliper, should be easy to find cheap and powerful, see what he comes up with. At this time, any caliper with a integral parking brake would probably too light for a truck app.

Here's a sample of his work- you can check out his other products.
D52 Caliper Rear Disc Brake Brackets - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hello Dave

I would be willing to develop something for the '88-'98 differentials if there was enough solid interest. However I would not be able to do anything on this for about 6 weeks. I have just entirely too much work right now. If I could get 4 or 5 commitments on rear disc brake brackets that would be sufficient for me to put the time into development.

Thanks
John
John Wastweet captainfab454@hotmail.com