schamran

My book says discard at or under 1.115." The rotor is 1.410" thick. I believe I have the wrong spec. HELP! Thanks.

DPFservice

1.46"

schamran

Great. I just had .040 taken off of them. There is still a ton of material left there though. I'll see how it works tomorrow.

Douglas2

hey-Hey!!!,
You can go thinner than spec'd IFF you keep the pads from getting too thin. The heat capacity of the rotor will suffer a bit, so if you happen to *NEED* maximum braking capacity it becomes a bit more important. For 99% of service, you just need to keep the pistons from comming too far out of their bore.
cheers,
Douglas

Rampage1967

I would be very, very careful turning rotors under spec. Mine were right at minimum spec when i got my truck and they were very badly warped. That said, the truck was used to tow a fairly light camper before i got it. (5000 pounds or so) The other thing is, if you let your pads go to far after turning the rotors extra thin you will not like the results. (exploded calipers)

I know it's tempting to save a few bucks this way, but, I think your life is worth more than the price of a set of rotors. Please do this job right.

Also, there are thick & thin rotors for these trucks. Use the thick ones. . they will be much less likely to warp. The 1.414 spec is the thick ones. They are listed as fitting Dodge & Chevy duallies among other applications. You may have to drill out the bolt holes to fit single wheel lugs, but it is worth it. I had to do this on mine after much checking with the parts store's suppliers to see if the y were the right rotors. (they were listed as being right according to the casting numbers on my old rotors)

BC847

For liability reasons, most reputable machinists will only go as thin as is cast into the side of the rotor (the min thickness spec should be there).

u2slow

Those big Bendix 1-ton calipers were used in factory applications with 1.25" and 1.5" thick rotors.

For that reason, I let the 1.5" thick rotors run well undersize so long as they are wearing evenly. I'm not recommending it, that's just what I do on my own vehicles and I sleep at night just fine.

Douglas2

So there are two sizes of calipers? That would be nice. What are their piston diameters?
cheers,
Douglas

u2slow

No - one size. Used with both thicknesses of rotor.

I believe the piston is 3-3/8".