Can't believe I missed this one before.
The only thing that came to mind when reading several posts here was:
Wrong, wrong, wrong, wrongity wrong.
Brian,
Write-up that damn info post so we can just point to it.
-Andy
you're Right, I Totally Forgot About That. Let Me See What I Can Do.
Brian,
Write-up that damn info post so we can just point to it.
-Andy
And doesnt cross drilling or slotting make brakes warp faster?
"Warp" is the wrong word to use. A high quality rotor with good manufacturing tolerances will come balanced and should wear evenly under normal use. Slotting and drilling (especially drilling) can create hot spots and miniature cracks that can get bigger in a hurry when the rotor is heat cycled.
Like I have said before, the only benifit I ever thought there was to cross drilling or slotting was to aid in offgassing of the pads, but after having talked to Andy and read what Rara had to say, I know that is no longer the case. I cant imagine why someone would think a cross drilled or slotted rotor won't warp. But then again, maybe he should just buy those cross drilled brake lines I linked to in an earlier post.
Unless a rotor was designed to be slotted or drilled you're only going to weaken it by cutting into it but the idea that the slots and holes are there to help cool things is just one of the automotive myths that refuses to die just like the idea of a rotor "warping".
you have obviously never resurfaced a rotor or worked in a shop that does brakes. Rotors do warp. Usually the first pass when you are turning a rotor is an agressive pass to true up the rotor, then you make another pass to smooth the surface.
In fact I have worked in a shop and have put hundreds of rotors on the lathe to get them smoothed out. The thing you're calling warp is actually a normal wear and tear problem because of the rotors runout specs. There was a reason the majority of rotors people brought in to be resurfaced were nice beefy oem rotors and the majority of rotors people brought in for "warping" were chinese made replacement rotors. Make a cheap rotor thats close to spec and the buyer has a much better chance of running into uneven wear problems they'll call warp.
In fact I have worked in a shop and have put hundreds of rotors on the lathe to get them smoothed out. The thing you're calling warp is actually a normal wear and tear problem because of the rotors runout specs. There was a reason the majority of rotors people brought in to be resurfaced were nice beefy oem rotors and the majority of rotors people brought in for "warping" were chinese made replacement rotors. Make a cheap rotor thats close to spec and the buyer has a much better chance of running into uneven wear problems they'll call warp.
In fact I have worked in a shop and have put hundreds of rotors on the lathe to get them smoothed out. The thing you're calling warp is actually a normal wear and tear problem because of the rotors runout specs. There was a reason the majority of rotors people brought in to be resurfaced were nice beefy oem rotors and the majority of rotors people brought in for "warping" were chinese made replacement rotors. Make a cheap rotor thats close to spec and the buyer has a much better chance of running into uneven wear problems they'll call warp.