Rotor depth Tundra vs 4Runner

[AntleredRuin]

Got junkyard rotors for my TBU/SBU swap. Look like they have plenty of meat left on them, just a slight 'lip' on the outer edge from old/undersized pads.
Was gonna get them turned but they guy said they are already too thin and he could not legally turn them.
They were cheap (came with the calipers I pulled) so not complaining too much; I may just file off the lip and hope for the best, as even cheap rotors go for $50 each. (Rockauto is cheaper, but shipping costs are friggin crazy).

My main question; what is the legal thickness necessary to turn and is it differentiated per vehicle/braking system?

The whole point of doing the TBU is the thicker rotor, right? (thicker = less overheating and 'warping'). So the 4runner rotors are thinner by default. So technically the 4runner rotor is closer to being legally 'too thin' than the Tundra rotor. So my 'too thin' Tundra rotors may be just fine for my T4R (may not notice increased stopping power though)? My stock rotors and pads are shot, so really anything is an improvement.

Am I missing something here?

 

[TXLX1]

If they have lip I wouldn't mess with it for that amount of work verus buying new rotor. If they spec out too thin they will build heat faster, and I'd be surprised if you could get them to be quiet after filing / grinding off a lip. But if you got the time and someone will resurface them, go for it.

 

[Dezert4Runner]

The rotor will have a min thickness in mm that they can be, so if it's already close to that number they will be too thin after turning and they won't touch them. Every rotor is different. Look for this stamping in the rotors you have and you'd need a set of calipers to measure current thickness.

 

[Tyler James Inc]

The turnable-thickness specs are per vehicle, and any reputable shop that turns rotors will have those specs on hand.

 

[phattyduck]

If they are worn enough to have a lip, the are worn enough to put bad patterns in the new pads and make them damage new rotors (if you get them before new pads), etc. Also, rotors that are too thin for the calipers/pads can extend the pistons in the calipers to far and damage the pistons/caliper bores.

Just get all new parts. How much is your truck and your life worth?

-Charlie

 

[pauldub]

Most, if not all rotors, have the min thickness specifed on them.

 

[JayRolla]

You always want to turn them to get rid of the brake material that might have built up and could cause a pulse. Get new rotors.

 

[HiluxSurf SSR-G]

Just an FYI, if you look at DBA and Brembo catalogs, the minimum rotor thickness is normally 2mm less than the original thickness