rear disc brakes on 3/4 ton and posi?

[sdwolff98]

Hey Yukon,
It is the rotor diameter casuing the issue yeah the dodges ar almost 14 inches diamateter the chevy 3/4's are 13 inches and the pad only contacts about half of the rotor. Looking at some options right now so I don't lose anymore than I have already had a set back looking at either a different set of plates for the caliper chevy would be my guess or a ford rotor of some sort.

Sean

[Yukon 400]

sdwolff98,

So you're looking with a rotor that is 14" in diameter and that is 3.65" deep?

[sdwolff98]

Hey Yukon,
Yeah essentially that also has the e brake lining in place I may have found something that will work waiting on the machinist to come over he has some ideas to look as well. I am eyeballing a front rotor from the same model dodge the inner well of the rotor is as smooth as the rears like I am using for the e brakes.

Sean

[Yukon 400]

I see, so you won't be riding on half of your e-brake pads since the front rotor hat does extent out to the back side rotor surface and is over an inch shorter than the rear?

I don't know what inside diameter you're looking for but I think the 2008 Dodge front has a slightly smaller inside diameter as they scraped my hubs when sliding over and the center bore is slightly smaller as it wouldn't completely clear the machined ridge on the hub that the rotor is suppose to center on.

I had many problems trying to get the 2008 ones working off the shelf without machine work, but the 2009+ ones solved all of those problems, not too sure if those are issues for your setup or not, but good luck I'm interested in seeing what you come up with.

[sdwolff98]

welp machinist came buy wont need new rotors or any of that we are going to make a caliper mounting bracket that brings the whole assembly in about 1/2 inch or so that will get the caliper pads resting where they need to be and that will leave my existing ritirs in place that are mated perfectly to the ebrakes now .

A little mor emoney a little more time but hell having a blast with this old beast of mine

Sean

[68 TT]

Originally Posted by sdwolff98

welp machinist came buy wont need new rotors or any of that we are going to make a caliper mounting bracket that brings the whole assembly in about 1/2 inch or so that will get the caliper pads resting where they need to be and that will leave my existing ritirs in place that are mated perfectly to the ebrakes now .

A little mor emoney a little more time but hell having a blast with this old beast of mine

Sean

The prototypes usually run much more money than you would think just due to all the little changes and refinements that happen. After you have them finished and ready to go someone with access to a CNC milling machine could whip those mount plates out in an hour or so with a set of CAD drawings.

With access to a water jet too you could rough out the non-critical outer shape on the water jet and cut the milling machine time in half. The water jet could even punch out all the holes with just minor finish work needed by the milling machine to speed things up even further. Some holes may not even need to be touched by the milling machine as the precision of the water jet could be close enough.

I'm sure somebody here has access to those machines and can save you a mountain of money making multiple sets. I used to have access to the toys after hours but changed careers so no longer have access to them. Pretty frustrating to have the ability but not the tools to do the job.

[sdwolff98]

Hey TT

Will look into them ideas and have a few extra sets made when time permits

Sean

[hayesperformanceplus]

So as of now what rotors, brackets, calipers, etc are we still working with?

[Beat68CST]

I want a set :P


They'd be great!

[hayesperformanceplus]

LOL, So would I!

[sdwolff98]

Hey Guys,
Machinist said no go on what he was trying to do to get the caliper further on the rotor. So back to square 2 atm. I have several options right now.
#1 ordering a chevy backing plate through the dealership here in town and go from there.
#2 investigate baer and brembro for a customized rotor to fit my needs
#3 get oreilly to get some measurements on the front rotors from the same model dodge I the backs from, was looking at some pics on oreilly site of the rotor and it looks like there is a braking surface on the interior of the rotor, just need measurements now.
For sure gonna do an axle search online and go to the junkyard on my day off tommorrow and check the chevy mounting plate and see how it compares to what I have.
Dodge calipers and brackets dodge backing plate.
2008 chevy rotor is what I am using as the base atm.
gonna keep forking it till done!
Sean

[sdwolff98]

Been doing some digging and apparently the same company makes the newer axles for both chevy and dodge trucks. Got two chevy axles to go eyeball, measure and compare brake backing plates on with the dodge plate that i have tommorrow morning. Once i have that info should have a better idea what needs to be done next to get this contraption together and working. The axle I got my dodge parts off of is a 11.5 RG and there is a place in ft worth I am calling to find out if they have the chevy 11.5 in house so I can do the comparisons and so forth. Nice thing is once I figure out if I need the chevy backing plate or a diffent caliper bracket all of the 2008 chevy trucks have 13 inch diameter rotors so really only differences in the rotors is the mounting depth.
Strike #2 off the top list 1800 per set of custom rotors
Sean

[68 TT]

Originally Posted by sdwolff98

Hey Guys,
Machinist said no go on what he was trying to do to get the caliper further on the rotor. So back to square 2 atm. I have several options right now.
#1 ordering a chevy backing plate through the dealership here in town and go from there.
#2 investigate baer and brembro for a customized rotor to fit my needs
#3 get oreilly to get some measurements on the front rotors from the same model dodge I the backs from, was looking at some pics on oreilly site of the rotor and it looks like there is a braking surface on the interior of the rotor, just need measurements now.
For sure gonna do an axle search online and go to the junkyard on my day off tommorrow and check the chevy mounting plate and see how it compares to what I have.
Dodge calipers and brackets dodge backing plate.
2008 chevy rotor is what I am using as the base atm.
gonna keep forking it till done!
Sean

NAPA has all the critical rotor dimensions on their web site so they may have the info you need. napaonline.com

[sdwolff98]

Hey 68TT,
Yeah been using them and autozone for that info. Looking at the dodge front rotors on there as we speak to see if it has the dimension I need. The one dimensino I need they dont have on their site going to have to go look at one and see measure my rotor ID and the dodge front rotor ID if they are reasonably close within a few thousands might be ablet o make it work with what I have.

Sean

[sdwolff98]

Got one of the chevy caliper brakcets in hand and waiting on another one from oreilly's auto parts. The bolt holes on the bracket I have in hand are wider that the dodge mounting spots and also require a spacer to fit the rotor properly. Will be picking up the other on tommorrow and head to the machinists to check and see if this might be an avenue to pursue. The chevy backing plates are significantly different from the dodge they are a rectangular plate rather than the trapezoidal like the dodge. Will have more to post tommorrow when the machinist looks at things a little more.

Sean

[Yukon 400]

If you want I can give you the measurements of the inside of the dodges from a 2009, I have since returned the 2008 ones as required machine work to fit over my hubs. They were just just a tad bit smaller on the center bore and inside hat bore.

[sdwolff98]

Hey Yukon them the front rotors? or the rears?

Thanks
Sean

[Yukon 400]

Those are fronts, I forgot that you're using hubs that had the drums on the backside so you may not have the clearance issues that I had, mine were from a 2001 with drums in front.

[Yukon 400]

I was wondering what size rims do you plan on running on the truck?

[sdwolff98]

minimum 16 inch rim as large as 18 depends on what I find i like when it comes time. The 16 inch wagon wheels I already have fit with no problems at this time.
sticking between 32 to 33 inch tall tire to take some of the stress off the engine running such a deep gear ratio in the back.
Sean

[Yukon 400]

Wow, 16" wheels fit? And you're using the dual piston calipers?

I can't get my 16.5" wagon wheels to clear nor will a 18" aluminum wheel, once i get these axles under the truck it'll be rolling around with some 16" duallies put on dish side in.

[sdwolff98]

ok got some chevy caliper brackets in now and waiting on the caliper to show up at oreillys. I think I may have something with the chevy 1 ton bracket. It needs spacing like the dodge bracket did but the bolting pattern to the backing plate is wide enough the the machinist can make a spacer bar/bracket to get it into place. Here is a picture of the three different brackets. Will know more tonight when I can skate by his house and get him looking at it. Looks promising at this time. Then get it all assembled and work on the e brake cable mounts and the metal brake lines on the axle itself.
Part of what was hampering him with the dodge bracket was that he had to shift the bracket up to get the clearance he needed then found out the pads were not meshing to the rotor like they are supposed to do. So taking another stab from another angle now

Sean

[sdwolff98]

ok got one of the chevy backing plates in hand and shore nough gonna have to make a new set of plates for them the machinist and I are waiting on the second brake plate to come in then we will get started yet again. Told him I might as well pay for him a vacation chuckles.
Will have more updates as we get things going again. all these parts match however so I am hoping it will all fall into place once the plates are setup.


Sean

[sdwolff98]

Wellt he machinist is working on the new plates. i have a complete matched set of parts this time *chuckles*. Should have some more updates later this week and next week. Looking at the idea of producing a few kits once i have the bugs worked through on this setup.

Sean

[Beat68CST]

Hey SD, any forward progress on the setup?

Hope it's going good, excited to see the setup!