I don't know about Jeep parts in particular, but I have NEVER had to have new brake rotors turned straight out of the box. This seems counter-intuitive to me. The rotors are cast and then machined from the manufacturer. They should be good to go ... if they aren't, I'd be looking for a new supplier.

 

many people are saying you should have brand new rotors turned out of the box?

Somethings wrong with this picture!!! Do you have a link to what "many people" are actually saying?

 

Just search brake rotors, or new brake rotors in the search forum tool. You'll find that several people mention maching rotors right out of the box. One individual mentions how its ONLY $15.00 and should be done. I also searched google, and saw several sites mention this. One guy said many new rotors need to be machined out of the box. Another said Raybestos rotors should be machined out of the box.

I was surprised by this myself, but thought I would ask.

 

B S

Quality brake rotors do not need to be turned before installation or use.

 

usually all rotors from asia should be turned. This is because the rotors are stacked to the top of the cargo hold in ships. stacking the rotors causes them to warp from sll of the weight.

 

I've never needed to turn rotors when they were brand new. I do know however, that some of the cheaper aftermarket rotors tend to warp fairly easily compared to quality products.

usually all rotors from asia should be turned. This is because the rotors are stacked to the top of the cargo hold in ships. stacking the rotors causes them to warp from sll of the weight.

Now what BS is that :rofl: You do know the vast majority of the cargo moved around the world is carried in containers? As long as the rotors are stuffed correctly inside the container, it doesn't matter into which tier the container is loaded on the cargo ship. Heck, the rotors that are cast & machined in USA are packed just the same way inside the containers or semis when they travel across the USA, or loaded to a ship carrying them to other parts of the world.

The difference is not all of the chinese manufacturers have as good quality control as some of the Western-world manufacturers -> that leads to bad quality products ending up on the hands of the customers.

 

I'd check run out on them and if it's out of spec, then have them turned. If run out is in spec though, there's just no reason for it.

 

On some vehicles other then Jeeps the rotors may have a hub with bearings in the center and is held together by the press fit of the wheel studs. These rotors are sometimes sold without the center section and need to be assembled with the old hub. They typically will distort slightly from the studs being pressed in and sometimes need to be turned when new. The design of the Jeep system does not require turning the new replacement rotors. However one exception might be if the rotors are of very poor quality. Good new rotors need no turning.

 

I just put on PBR rotors right out of the box. Absolutely no vibration or odd wear at all. Just perfect.

 

When I went to school for auto mechanics I learned that its good practice to check rotor runout and turn if needed.With that being said I have yet to need to turn a new rotor,no matter how cheap.Some shops do it just to cover their a** and prevent a return because of a bad rotor.

 

in 20 years and 30 or so sets of new rotors ...never ever