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Discussion Starter · #1 ·
Replaced all four rotors no more than 10 months ago (RDA Slotted), fronts are already warped - I get that awful shake on sudden braking, or when applying them gradually at high speed.

I know that constant hard braking, rapid heating/cooling and such like can warp them - that's why they were replaced originally. Obviously since then I have changed my driving habits to avoid that same issue again, but unfortunately it did not work. I suspect it is just down to cheap nasty rotors.


First option I have is to get the rotors machined, though looking at cost vs thickness of rotor lost, it may be just as much to get new rotors, so, what can you guys suggest?

daevilone - you do autocross don't you? That must involve hard braking - what do you run?
 

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he doesnt have an auto, autos murder brakes, mums did the same, likewise in sisters camry :p
 

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I started a thread on the same thing earlier in the year....I had two sets of RDA slotteds go warped on me.....

The first set I thought was bad luck, the second set, I was pretty annoyed, and opened up a returns case with RDA through the place I bought them.

After about 9 months I eneded up getting my money back, so I suppose thats something...

They tried to blame me for my car not being in good condition.....When I mentioned that I bought another brand and they were ok....they went a bit quiet.

Problem is that I have heard similar stories from people with DBAs on different cars (like fords)
And thats pretty much it for the Australian manufacturers, PBR only make plain rotors...and I've used them before and theyre fine.


In the end I ordered a set of 4 from the US from Brake Rotors: R1 Concepts E-Line Performance Brake Discs | R1Concepts.com

I only bought their e-line rotors, they do a more performance oriented set...I didnt think it was needed, I only do "spirited" road driving in that car.

And so far after 9 months no issues.

I like the zinc plating too, stops them all going rusty on the edges.


And yeah, I wouldnt bother machining them, especially if the material is suspect, they'll probably warp again
 

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well I ran stock rotors for a year (what came with the car, including whatever pads came with it. So with the hard breaking from that I didnt warp any rotors or anything.

Currently I've got RDA slotted at the front with Lucas TRW pads. They've been pretty damn good so far.


but agreed with the autos kill brakes comment. My brakes hardly get touched driving around on the street.
 

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RDA and DBA have had bad quality the last few years with warping etc
 

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Discussion Starter · #7 ·
I told you they were. Time to go for a group buy somewhere Jason.

I want to get mine done asap before other things wear away from the shuddering whenever I apply them.
 

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just get some mazda6 rotora and calipers and then ur got some good rotors and big rotors too a cheap big break kit :)
 

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working on this myself as well now. My rotors from R1 have just warped as well. I have had them for two years and a bit so they had a good life.

I have a set of Mazda 6 Calipers that arrived this week so now i'm trying to secure some rotors to do this mod myself.

just get some mazda6 rotora and calipers and then ur got some good rotors and big rotors too a cheap big break kit :)
 

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Were you using their E-line or perfomance ones ?

unfortunately for us 1st Genners, using mazda 6 rotors would mean converting to 2nd Gen hubs and maybe Knuckles as well.

its something I have considered, but havent fully researched.
 

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I purchased the performance ones. they have had a good beating mind you.
 

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All I can say is I have seen the way u guys brake. Not all suprised they have warped though. Having said that, they are cheap rotors, we all know that, Thats why we bought them all to begin with. I have some stock ones that are still perfectly fine if you would like them?
Otherwise maybe a mazda 6 brake buy is a better option.
 

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i have a good set im not useing now ive got my 13inch ones
 

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i have two spare sets of stock ones as well but i'm going to try they mazda 6 ones first
 

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All I can say is I have seen the way u guys brake. Not all suprised they have warped though. Having said that, they are cheap rotors, we all know that, Thats why we bought them all to begin with. I have some stock ones that are still perfectly fine if you would like them?
Otherwise maybe a mazda 6 brake buy is a better option.
Its funny that, I have never had issues with rotor warping with genuine mazda rotors....even on my first GC that had solid front discs, I used the then available Bendix Metal king plus pads on them....I regularly got the brakes hot enough to burn all the paint off the pad backing plate.....Rotors were fine, never had a prob.

I bought a pair of replacement PBR ones after the genuine ones wore out and even they stood up to that kind of hammering, like 3 stops from 140-50 in quick succession.....

when I warped my RDAs on the GD I wouldnt have been doing anything like that.....I reckon I did one 100-0 quick stop and they were rubbish after that.

looks like genuine rotors might be quite a bit better than after market.
 

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Genuine are the best

It's all about the metal used.

one of the problmes now is Soft metals for better brake performance

So aftermarket disc makers have to make them as soft and strngs as stock yet it cost more ot make brakes out of different materials

Now days it' not uncommon to change your rotors -at 30,000km's because the car makers create such hollow discs for cooling and soft metal base when it's cast that the pads and disc wear rats is not longer a 5-50 ratio it's more like a 1-3 ratio.

So many new cars you can't machine the discs on them anymore after the 3rd pad change they are already below minimum.
 

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Discussion Starter · #18 ·
So it is likely that my warped rotors are normal? I have done ALOT of driving since fitting them.
 

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**WOOT** Mazda 6 front rotors and calipers secured. I'll let you all know when i'm in receipt of them and update my gallery.
 

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What pads were you running? I've heard of certain pads leaving residue on rotors eventuating in them warping. Namely DBAs mixed with Bendix GCTs but might ahve the same affect on RDAs?
 
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