Watching with great interest.
When first considering discs I was thinking I wouldn't want to flip the rear hubs, but seeing how having them flipped hides the rotors inside the wheel far from potential "road" damage, I am sold on flipping them.
An additional benefit of flipping the hub is with the HEMTT rims I am running this would give me the same track width front and rear. With the HEMTT rims as they are the rears are tucked in just a bit compared to the front.(I am assuming here the front and rear axles are actually the same width which could be an incorrect assumption.)
This flipping the rear hub would also make the HEMTT wheel clamping bolts accessible with the tire mounted. Just o check tightness periodically for maintenance.
Concerns about rotor strength and GVWR. The LTL9000 GVWR is from 35-60,000 from what I can find, which is a good thing because the rotor specs for the front axle on the LTL9000 and the front Ford F550 appear to be the same which is very odd seeing they have such a large GVWR difference. It is important to note that all heavy hauling M800 and M900 series have drum brakes for a reason on the back. Personally I don't think I am going to be hauling much over a 5tons so a total weight of 35k or so running these discs with some heavy calipers on all 6 wheels seems decent to me.
The Dual piston caliper for the LTL9000 has 2.88 diameter pistons. (These cannot be mounted with a plate style mount welded to the axle and are for reference here only)
The F750 Dual piston caliper has 73mm (2.87") diameter pistons (Physical appearance varies per year but all seem to have 73mm pistons, some have only 2 mounting bolts others have 4 but all can be plate style mounted)
The only reference for the F750 4piston diameter says 70mm(2.75"). This is the one I would want to run as it has 6 total mounting bolt holes to take the sheer load where theF750 dual piston has at most 4 that I have seen. (BUT DOES IT FIT!!! that is what
FordTruckGuy96 is going to find out for us soon when trying to put some studs into the rotor. (See post 1 in this thread).
Ford F750 2015 All Engine Left with 70 mm Piston, Rear Mount Caliper. Ford F750 2015 All Engine Right with 70 mm Piston, Forward Mount Caliper. Ford F750 2009-2013 All Engine Left with 70 mm Piston, Rear Mount Caliper.
www.ebay.com
The F550 Dual Piston caliper has 64mm (2.51") diameter pistons or 66mm pistons on some others depending on year. 2 or 4 sheer bolts.
Buy Nugeon Brake Caliper Dual Piston Floating - NUG 9918059A online from NAPA Auto Parts Stores. Get deals on automotive parts, truck parts and more.
www.napaonline.com
At 1000psi that gives the Dual Piston 2.88(2.87) 6514LbF of force per piston. (about 9% more force than the 4 piston)
At 1000psi the 4 piston 70mm gets 5965 Per opposing pair ,since each pair of 5965lbf pistons only are pressing against each other. More evenly and modulated as the front piston pair clamps first giving a better "peddle feel"... or so they say but it does not double the force).
Obviously the Deuce with the 5 ton disc brake axles starts and stops fine, has only 2 sheer bolts per caliper and seems to be working fine, but a fully loaded 5 ton may not. I think the recommendation to use the 4 piston caliper has merit... BUT DOES IT FIT! We shall see.
Napa Rotor for LTL9000:
Buy NAPA Premium Brake Rotor - NB 4886839 online from NAPA Auto Parts Stores. Get deals on automotive parts, truck parts and more.
www.napaonline.com
The rotor that "seems" to match the one
FordTruckGuy96 has for the F550 LN7000, C8000 and a bunch of other medium commercial models:
Centric 120.79016 Disc Brake Rotor - Front, 15.37 in. OD, 10 Bolt Holes, Vented Design ✓ Order now for same-day shipping on eligible purchases from FinditParts.com, America's online marketplace for heavy duty parts.
www.finditparts.com
The photos are not mine but from the Bobbed Deuce on 5 ton link in the other comments above.
![1668099730876.png 1668099730876.png](https://www.steelsoldiers.com/data/attachments/639/639332-1cdfd99563985e996e8d0aa4b0b28ef6.jpg)