EBC discs warping

[taylormj4]

Hi all,
My first posting on here.
I changed all the discs on my Chimaera 450 some years ago for EBC non-grooved discs after I started to get steering judder under braking indicating warped front discs. Not sure what the original discs were.
I now have the same problem. Any ideas what can cause a disc to warp like this ? No noticeable deposits or damage to the discs. Are EBC discs just poor or do I have a caliper problem. Noted that the last set of pads had worn at outer edges more than inner edges. Calipers are standard TVR naff single-pots.
Braking is not great at best of times (i.e. pre-disc warp). If I jab the brake pedal quickly then release not a lot happens. Hard braking only achieved by constant hard pressure. Fluid changed, no effect. Pads are Greenstuff.
Cheers, Matt

[garagewidow]

sounds like the yoke sliding pins are seized,corroded or dry which may be the reason the pads are wearing unevenly and possibly causing disc distortion.

[stuh1980]

hey mate, this might not be read as it`s quite late but i know from experience that sitting on the foot brake at traffic lights and whatnot causes discs to warp when they are hot, maybe not the case here but you never know, stu

[Hooli]

garagewidow said:

sounds like the yoke sliding pins are seized,corroded or dry which may be the reason the pads are wearing unevenly and possibly causing disc distortion.

This, plus if they are properly seized the discs will be flexing at the pad due to the much higher brake pressure on one side which can cause a shudder even if the disc isn't warped.