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George Funa
TryHard
NSW
Soarer TT

Posts: 335
Reg: 05-2006

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Tuesday, May 31, 2011 - 09:03 pm, by:  George Funa (Fun001) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I have slotted rotors that are warped. Can I get them machined or do they have to be replaced

Cheers
Ross Pesina
TryHard
Vic
Soarer T, Soarer TT, Supra TT,

Posts: 406
Reg: 08-2006

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Tuesday, May 31, 2011 - 10:00 pm, by:  Ross Pesina (Ross79) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

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.
George Funa
TryHard
NSW
Soarer TT

Posts: 336
Reg: 05-2006

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Tuesday, May 31, 2011 - 10:39 pm, by:  George Funa (Fun001) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks for the response Ross.Looks Like I need new discs.

Can a mechanic identify which discs need replacing.

When I am doing 100 on the freeway and hit the brakes my car shakes so I reckon it is the discs. So for what reason do people get there disc machined
Murray Lund
TryHard
NSW
V8

Posts: 456
Reg: 07-2005

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Wednesday, June 01, 2011 - 04:49 am, by:  Murray Lund (Murray) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

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.
Damian Ware
Goo Roo
Victoria
UZZ32

Posts: 2042
Reg: 10-2005

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Wednesday, June 01, 2011 - 09:03 am, by:  Damian Ware (Frozenpod) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Machining discs not for warped discs .

Not all warped discs can be saved by machining but most can.
Vincent Chan
TryHard
nsw
v8

Posts: 119
Reg: 12-2010

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Wednesday, June 01, 2011 - 02:50 pm, by:  Vincent Chan (Vincent191) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

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.
Ali Saeed
Goo Roo
WA
UZZ31

Posts: 3444
Reg: 09-2007

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Wednesday, June 01, 2011 - 04:17 pm, by:  Ali Saeed (Ali) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

to be honest, discs are so cheap now days, its not really cost effective to machine them.
Nathan Smith
TryHard
Victoria
V8 Limited

Posts: 106
Reg: 04-2009

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Wednesday, June 01, 2011 - 05:20 pm, by:  Nathan Smith (Zanjara) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

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.
George Funa
TryHard
NSW
Soarer TT

Posts: 337
Reg: 05-2006

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Wednesday, June 01, 2011 - 11:04 pm, by:  George Funa (Fun001) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

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.

Thanks for all the good info
Scott Casey
DieHard
nsw
soarer v8

Posts: 664
Reg: 02-2008

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Friday, June 03, 2011 - 06:41 am, by:  Scott Casey (V8soarer_1991) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

keep the slotted discs.

if they overheated with normal driving should track down why did they overheat and fix that first.

if you were flying around the track well that's a different story.
Aaron Mead
Goo Roo
NT
Celsior 1UZ-FE Mines, JZZ30 1.5JZ-GTE To4z

Posts: 3136
Reg: 03-2006

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Wednesday, June 22, 2011 - 05:36 pm, by:  Aaron Mead (Aaron) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

How the do you 'warp' a disc? You know what kind of heat load it takes to do that?

http://www.stoptech.com/tech_info/wp_warped_brakedisk.shtml
Aaron Casey
Goo Roo
nsw
'94 jzz30 gttl, 2 mini's one supercharged :-)

Posts: 2912
Reg: 08-2005

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Wednesday, June 22, 2011 - 06:09 pm, by:  Aaron Casey (Blownminiturbo) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

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
Jan Christiansson
DieHard
NSW
Soarer V8 SC Manual

Posts: 548
Reg: 07-2005

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Wednesday, June 22, 2011 - 07:57 pm, by:  Jan Christiansson (Janoc) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

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.
David Ward
TryHard
Victoria
2.5 TT & 3.0 TT

Posts: 462
Reg: 10-2006

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Wednesday, June 22, 2011 - 10:33 pm, by:  David Ward (Djwtoyota) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks Aaron Mead, for the fascinating link. Well worth the extended read. Most enlightening,
cheers
Gary Redman
TryHard
NSW
Accord Euro Luxury

Posts: 459
Reg: 09-2005

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Friday, June 24, 2011 - 11:59 am, by:  Gary Redman (Gary) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

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.
Tim Kroek
Tinkerer
NSW
Soarer V8

Posts: 68
Reg: 02-2006

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Friday, June 24, 2011 - 04:53 pm, by:  Tim Kroek (Kroek) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

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.
Dave Rose
Goo Roo
wa
uzz31 v8

Posts: 1600
Reg: 03-2007

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Friday, June 24, 2011 - 05:21 pm, by:  Dave Rose (Sand_groper) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

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

Posts: 2908
Reg: 07-2005

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Friday, June 24, 2011 - 06:25 pm, by:  Dan McColl (Hoon) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Another thing that causes problems is incorrectly or unevenly torqued wheel nuts.

Usually the monkey on a rattle gun at the tyre shop cranking way too much into them.

They need to be torqued accurately with a torque wrench.

To answer the OP, yes they can be machined as long as they aren't or don't go undersize.
Shaydan Penniment
TryHard
WA
R34 GT-T

Posts: 399
Reg: 08-2010

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Saturday, June 25, 2011 - 12:29 am, by:  Shaydan Penniment (Shaydy) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

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

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