I found it. Look here:
http://gmcmotorhome.com/commodore/front_brake/index.html

Check the front Rubber brake hose as it probaly collaped and not letting
the pressure return.

On Sat, Apr 21, 2018 at 9:16 AM, Ken Henderson
wrote:

> Also, mount the caliper to the knuckle, using the slide pins, without pads
> installed. Slide the caliper all the way in- and out-board to be sure
> there's no interference between the caliper and the knuckle. Some slight
> grinding of the knuckle may even be necessary for clearance. These days,
> this precaution (from Dave Lenzi at Tucson and before) is applicable to
> both standard and 80 mm calipers.
>
> Ken H.
>
> On Sat, Apr 21, 2018 at 10:59 AM, Ken Burton wrote:
>
>> I found it. Look here:
>> http://gmcmotorhome.com/commodore/front_brake/index.html
>>
>>
>> --
>> Ken Burton - N9KB
>> 76 Palm Beach
>> Hebron, Indiana
>>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Also, mount the caliper to the knuckle, using the slide pins, without pads
installed. Slide the caliper all the way in- and out-board to be sure
there's no interference between the caliper and the knuckle. Some slight
grinding of the knuckle may even be necessary for clearance. These days,
this precaution (from Dave Lenzi at Tucson and before) is applicable to
both standard and 80 mm calipers.

Ken H.

On Sat, Apr 21, 2018 at 10:59 AM, Ken Burton wrote:

> I found it. Look here:
> http://gmcmotorhome.com/commodore/front_brake/index.html
>
>
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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That wasn't really a complete description of Dave's caution: He especially
mentioned interference of the inner pads with the caliper itself,
especially the SS tabs which wrap around the pad from the
anti-rattle/squeal pads on the back. He's found those binding also. Says
newer PF 052-20 pads have the SS backers riveted rather than tab-mounted.

Ken H.

On Sat, Apr 21, 2018 at 12:16 PM, Ken Henderson
wrote:

> Also, mount the caliper to the knuckle, using the slide pins, without pads
> installed. Slide the caliper all the way in- and out-board to be sure
> there's no interference between the caliper and the knuckle. Some slight
> grinding of the knuckle may even be necessary for clearance. These days,
> this precaution (from Dave Lenzi at Tucson and before) is applicable to
> both standard and 80 mm calipers.
>
> Ken H.
>
>
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Ken Burton wrote on Sat, 21 April 2018 10:59

I found it. Look here:
http://gmcmotorhome.com/commodore/front_brake/index.html

Wow completely forgot about those pictures and instructions from Arch, it has been literally a decade. Thank you Ken

Brought the GMC over to our house from the storage location last week (HOA will not allow me to park it here) and discovered that one of the brakes was sticking.
I figured the easiest way to tell which wheel was sticking was to check the temps of the brakes at each wheel.
It took me some time to locate my temp gun and when I started checking 5 out of six drums/calipers were around 110 degrees but the right front disc was close to 600
The rotor appears to be ok
I decided to replace the caliper and hose on both sides since Murphy lives next door. The cost to just go to 80mm calipers was not much of a difference so I am going that way.

The parts got here yesterday (thank you JimK) but now I am trying to figure out what casting marks I need to grind down, does anyone have a picture?
Are ther any gotcha's I should watchout for?