Tuesday, May 31, 2011 - 10:00 pm, by: Ross Pesina(Ross79)
You can't get any warped discs machined. Once they're warped they're a throw away, slotted or not. I recently had to toss my rear (stock) discs because they were warped.
Wednesday, June 01, 2011 - 04:49 am, by: Murray Lund(Murray)
I am surprised by Ross's response that warped discs cannot be machined and would be interested to hear other responses. I would have thought it depended on the degree of warp, and the thickness of the disc - they do have a minimum thickness below which they cannot be machined.
Wednesday, June 01, 2011 - 02:50 pm, by: Vincent Chan(Vincent191)
Most mechanic will not advise machining warped discs. In fact my mechanic will not advise machining a disc that had been machined once before especially on newer cars with soft discs.
Wednesday, June 01, 2011 - 05:20 pm, by: Nathan Smith(Zanjara)
Rotors can be machined regardless.. A life of a rotor depends on how much you brake.. heavy braking will less the life not only of the rotor but also the pads. In regards to warped rotors yes they can be machined. That is why they have a min thickness on all rotors before they are under size and need to be replaced.
The rotors on brand new cars no matter what make of car it is you should be able to get away with at lest 2 skims before they will be undersize and need to be replaced..
George: I would go to a brakes place like ABS to see what they think. You may get away with them skimming over the rotors to make them true again. The only time you would not get rotors skimmed is if the rotor itself is cracked which tends to happen under hot temps.
Wednesday, June 01, 2011 - 11:04 pm, by: George Funa(Fun001)
Thanks for all of the responses.
I went past a brake specialist and he informed me that slotted rotors can be machined even though it is not a easy job to do. The rotors look good and I have had them since new. I was told I can get normal dics for around $100 each. So I will see how I go.
Wednesday, June 22, 2011 - 06:09 pm, by: Aaron Casey(Blownminiturbo)
many ways... constant heavy breaking, mountain runs and braking the entire way down lol we have the police driver training for nsw here and used to do them 3-4 sets a day lol
The discs usually warps if you sit with the foot on the brakes after hard driving and you stop at red lights or in heavy traffic. They usually don't warp if the car is rolling. Because you get the heat spread out over the whole disc.
Friday, June 24, 2011 - 11:59 am, by: Gary Redman(Gary)
They may not be warped but instead you might have heat spots in them. These can be difficult to machine out. Even after maching the discs will look good and heat spots will appear to be gone but the underlying metal is still the same and the brakes will shudder.
Friday, June 24, 2011 - 04:53 pm, by: Tim Kroek(Kroek)
Most of the "warping" people always refer to isn't warping at all. The heat levels you need for that are crazy. It's more likely to be thickness in the disc due to runout, usually caused by poor fitment. Hubs not being completely cleaned properly (absolutely spotless and rust free) before fitment of the rotor is the most common problem.
Any rotors, slotted or not can be machined. If someone is telling you it is difficult because of being slotted they have no idea what they're talking about.
Friday, June 24, 2011 - 05:21 pm, by: Dave Rose(Sand_groper)
I used to send quite a few cars for a skim from the car yard and found time and time again it was the n/s/front that was the bad one.I asked the forman why ,he thought it had a lot to do with the n/s had more instance cooling from puddles !! sounds feasable ??
Dan McColl Goo Roo Victoria (The Nazi State) Pretty Red Thing and The Black Beast
My front left was warped, shuddered when braking from 75km/h + i got the front two skimmed, they are still in the allowed thickness dimensions. And now they are working good as new