Disc Brakes which is better

curious how well the two bolt disc setup compares to the 6 bolt?

my dana 30 axle has the two bolt and I rebuilt it thinking that would be the easiest solution.
my curiousity is that the calipers have a large portion on each side that keys into the caliper mount (instead of a pin) with all this surface area do they ever bind up? is this something I am over worried about.

any best practices to make sure they work well.

I have some 6 bolt brackets that have pins but I am guessing this is a GM bracket.

 

I have had both. I never could tell a difference.

 

I have D30 knuckles and used 2 bolts to hold the caliper on. The mount itself has 6 holes for the hub mount. Not sure what part you are looking at.

 

The 6 bolt mount is from a 77-79 and uses 1 1/8" rotors. The caliper bracket actually bolts on the 6 spindle bolts thus the "6 bolt" designation. This gives you a larger rotor and is preferred by many people. Standard 6 bolt bearing hubs.
There is a 80-81 version that has 2 bolts on the knuckle that hold the caliper bracket that uses a 7/8" rotor. These came with 6 bolt bearing hubs and are also a good setup to use.
There is also a 2 bolt style that was used from 82-86 that uses the same 7/8" rotor. These came with a 5 bolt bearing hub that you cannot buy a quality locking hub for and so most people buy a set of 6 bolt bearing hubs.
All 3 use a different caliper.
Clear as mud? The 5 and 6 bolt bearing hubs can confuse you when terms are being used. Most parts catalogs use the "6 bolt" and "2 bolt" designator for the calipers but can be further confusing as there is a year break between the bearing hubs.
All are superior to drum brakes especially if you ever get them wet going through water crossings.
I have never seen a stopping difference between the 3 different setups.
If buying a set, one would be best off with a set of 6 bolt bearing hubs.

 

this is a two bolt, it mounts on the steering knuckle with two bolts. as you can see the two top ears are shaped to Key into the caliper


as Darryl put it I have the "There is a 80-81 version that has 2 bolts on the knuckle that hold the caliper bracket that uses a 7/8" rotor. These came with 6 bolt bearing hubs and are also a good setup to use."

I just want to know if these caliper mounts cause any ill symptoms like the caliper binding?
on the above picture you can see the caliper rides on the two top ears to keep centered on the rotor, compared to what I think is a more modern way with the caliper floating on two pins.

I do have a 6 bolt plate on hand, but I would think I need to change everything from the disc to the caliper etc to use this and not sure its worth the effort when I just rebuilt this 2 bolt setup.

 

That is what's called a sliding caliper setup. Similar to what Ford used for a LOT of years and so did Scouts. No problems as long as the slides are in good shape and kept lubricated. I like to use the copper anti-seize as it doesn't wash off as easy and no electrolysis issues like with some aluminum based lubricants. Synthetic brake grease works well but in my area with the typical rain it tends to wash off quicker.

 

thanks!
I purchased napa brake calliper grease, assuming its synthetic I will use it as its on hand.
do I have to clean the paint off anything on the calliper mount bracket?