3500 Rear Calipers On A 2500

[GCecchetto]

Hello;

So, the 3500 dually rear calipers are the same fitment as the 2500 calipers but have larger bore pistons. Curious if anyone has put the dually calipers on a 2500? I know the master cylinder/hydro boost is also the same between the two models, but concerned there might be some different ABS programming. Any info would be much appreciated.

Thanks

 

[GSP7]

Watching this thread:

I have a 3500 single wheel short bed, I'll have to compare part numbers

 

[GCecchetto]

Watching this thread:

I have a 3500 single wheel short bed, I'll have to compare part numbers

Well, you can watch the thread, but it doesn't look like you're going to see anything

 

[GSP7]

Hello;

So, the 3500 dually rear calipers are the same fitment as the 2500 calipers but have larger bore pistons.......

Can you post the info that confirms that?

.

 

[GCecchetto]

Can you post the info that confirms that?

.

Just what I was told by Glenn at EGR Brakes and he knows the RAMs well and has been offer brake parts/kits/upgrades for them for a long time, so I trust him. He asked me if I wanted the lager bore dually calipers when I ordered mt calipers from him. Chose not to since I don't know if there is different ABS programing.

 

[Ozymandias]

What should this be good for? The factory is plenty powerful enough to lock up the rear with the ABS regulating it down to a useful level.

 

[BigPapa]

I can’t confirm fitment, but I can confirm SRW is 45mm pistons and DRW are 51mm. Rotors and pads are the same.

As Ozy mentioned, I really don’t see a gain to justify the trouble and expense.

 

[Diesel85]

What I find interesting is the front and rear rotors on my DT 1500 are bigger by 3/4" than on the 2500/3500 SRW. 14.8" versus 14.2".

From my experience of playing with brakes, the larger the rotor, coupled with cooling mechanisms (drilling/slotting/venting) is great way not to get warped rotors as easily. Not so much for stopping on a dime (well, kind of, reduced brake fade). Probably about the best way to explain it...

 

[AH64ID]

Hello;

So, the 3500 dually rear calipers are the same fitment as the 2500 calipers but have larger bore pistons. Curious if anyone has put the dually calipers on a 2500? I know the master cylinder/hydro boost is also the same between the two models, but concerned there might be some different ABS programming. Any info would be much appreciated.

Thanks

What year?

I understood the 4th Gen larger rear “max tow” calipers were installed on larger 365mm rotors (vs standard rear 358mm rotors).

What I find interesting is the front and rear rotors on my DT 1500 are bigger by 3/4" than on the 2500/3500 SRW. 14.8" versus 14.2".

From my experience of playing with brakes, the larger the rotor, coupled with cooling mechanisms (drilling/slotting/venting) is great way not to get warped rotors as easily. Not so much for stopping on a dime (well, kind of, reduced brake fade). Probably about the best way to explain it...

The 1500 rotors are much thinner and won’t hold up to sustained braking like the HD rotors.

 

[BigPapa]

What year?

I looked at a 2018.

 

[AH64ID]

I highly doubt there would be any appreciable difference in ABS programming as the friction between the pads and the rotor has the biggest impact on that.

You would likely have a much bigger impact on ABS by going with a non-OEM pad.

I looked at a 2018.

I wonder if the 365’s are just on the 19+ DRW trucks.

The OP didn’t state what year he has.

 

[Diesel85]

The 1500 rotors are much thinner and won’t hold up to sustained braking like the HD rotors.

It all has to do with the swept braking area to dissipate heat. Thicker rotors hold heat.

Not saying you should put 1500 rotors on a 2500/3500, but a larger swept area is what you are after with the DRW brakes if you catch my drift.

 

[AH64ID]

It all has to do with the swept braking area to dissipate heat. Thicker rotors hold heat.

Not saying you should put 1500 rotors on a 2500/3500, but a larger swept area is what you are after with the DRW brakes if you catch my drift.

Yes they will cool faster, but they will also warp easier when they are thinner since they will heat up faster and hotter with the same friction applied to their surface.

1500’s are 14.9x1.2/14.8x0.87
19+ HD’s (non DRW max tow) are 14.17x1.54/14.09x1.34 and Max Tow are 14.6x1.49

Bigger brake disc diameter also doesn’t indicate more swept area. If the pads aren’t as tall you could have less swept area. Generally you get more swept area, but it’s not guaranteed.

I can’t find the total swept area for the brakes I listed above.

 

[BigPapa]

Are the 1500 wheels larger diameter than the 2500/3500? That will limit rotor diameter.

 

[GCecchetto]

I can’t confirm fitment, but I can confirm SRW is 45mm pistons and DRW are 51mm. Rotors and pads are the same.

As Ozy mentioned, I really don’t see a gain to justify the trouble and expense.

Well, I'm replacing my rear calipers anyway, so the cost difference is basically $00, and my truck is an AEV Prospector XL with 41" tall tires.

 

[sag2]

You still don't say what year. I looked at 2020 and dual rear wheel caliper is different PN from single, and gas engine 3500 is yet another PN. The caliper adapter is different on DRW with 865 torque Aisin as compared to non Aisin.

 

[GCecchetto]

You still don't say what year. I looked at 2020 and dual rear wheel caliper is different PN from single, and gas engine 3500 is yet another PN. The caliper adapter is different on DRW with 865 torque Aisin as compared to non Aisin.

If you are asking me, my truck is a 2014, so we’re talking about model years 2013-2018. I don’t know if 2019 on is the same or not. From the post above about the 2020 part # being different I would guess not.

 

[AH64ID]

If you are asking me, my truck is a 2014, so we’re talking about model years 2013-2018. I don’t know if 2019 on is the same or not. From the post above about the 2020 part # being different I would guess not.

You should either fill out your sig or put more model information in the original post. This forum section covers 2010-current trucks.

With your setup I would get the larger bore caliper if you can.