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[johnnydog]

I put a pair of TRW rear vented discs on my 3.2 a good number of years ago, and they have been fine.

[TheBoy]

but they were genuine TRW, is that not a good make?

If they have deformed and are nowhere near at the end of their life, you have answered your own question.  Even more so if you don't use the brakes heavily.


But don't forget to check the wishbones!!

[GrahamT]

I put a pair of TRW rear vented discs on my 3.2 a good number of years ago, and they have been fine.

I've had issues with buying parts from ebay etc, good makes, to find out that they are factory rejects and should never have been sold. So I think it's just as important to know where they came from as well as the brand.

[TheBoy]

Anything from ebay is likely to be fake...

[Nick W]

to

my car doesn't get used daily (and also i don't brake a lot) so rust on the discs has been a problem.  does get used every week though.  last judder was definitely caused by rust on the inner discs, seemingly it is a common mig issue.  new discs fixed it. old discs were badly pitted but only on the insides.

Uneven wear on the inner face of the disc is not just an Omega problem; it is common wherever single-piston sliding calipers are used.

My opinion is it's not the replacement of a 'warped disc' that cures the problem, but that the caliper is cleaned up in the process. It's an opinion, because I've never seen anyone actually measure the run-out on a supposedly warped disc and compare it to the replacement. That includes me, as I wouldn't fit new pads to an obviously unevenly worn disc.

[TheBoy]

I know Rover dealers where given a run out measurement tool when one of their suppliers cocked up, and went through a phase of disc warping after abuse - guess who had an affected car at the time .

I did had the report they wrote with the figures on after the 2nd time, but binned it with the other history when the car was written off.

[johnnydog]

Anything from ebay is likely to be fake...

That's a bit harsh, isn't it? I have bought plenty of genuine GM / Vauxhall parts from EBay over the years, and not had a problem with any of them. That includes shockers, steering /suspension components, coil packs and plenty of other items. They all need to have the original packaging / labelling with the hologram, but to say everything from EBay is likely to be fake isn't really true. As with everything, care needs to be taken, but if you take that care, the genuine items are out there.

[omega2018]

update on this:  i took the car to kwik fit for their free brake examination (saved me jacking the car up and taking off the wheels in the cold). 

they took it for a test drive with me in which was a waste of time because it only happens above 50 or 60.  so we got back in in the warm dry workshop and wheels off.   n/s disc was uneven according to them but i suspect that might just be his attempt to sell me a new disc.  however when we looked at the o/s, the disc was visually catching on the pads in places.  so the o/s disk has worn unevenly ( i think that may be a better description than 'warped' as the unworn outer rim was still true).  probably me stamping on the brakes when swmbo said i was too close/too far away/too fast/too slow/or when she was arguing with the sat nav. 

anyway the juddering seems a bit less now i am hoping that where the disc catches the pad it will wear back to even again?

incidentally kwick fit also assured me the brake fluid needed changing as it  is 'too dark, should be clear' .  i didn't bother telling him i had thoroughly changed it only 18months ago and the colour was as it came out of the bottle.

[TheBoy]

Anything from ebay is likely to be fake...

That's a bit harsh, isn't it?

Nope, just honest.

A stat came out a couple of years ago that 95% of "genuine" branded goods on ebay are fake.

And overpriced.

[TheBoy]

anyway the juddering seems a bit less now i am hoping that where the disc catches the pad it will wear back to even again?

No

[Magwheels]

As stated more than likely to be knackered or S### discs. If it bothers you that much run it down your local friendly MOT station and put it on the rollers, it'll soon tell you if the disc/discs are the cause as the readings will fluctuate accordingly (front or back). If they don't then start looking somewhere else. Tyres would be my next point of call as they often go out of round on a standing car.

[ronnyd]

Could it be sticky caliper pistons?

[omega2018]

when we looked at the o/s, the disc was visually catching on the pads in some places.  so the o/s disk has worn unevenly

TB you'll be pleased to know kwik fit are in agreement with you.  they said the discs will not wear flat again, they will get worse.  i still don't understand why, you would think if the pads are catching on some parts of the disc, those parts, the 'hills' will wear more than the 'valleys', eventually flattening out.  maybe more likely so if i am gentlle on the brakes - i can see if i put the brakes on full the pads will just track the deformed disc.

as stated the discs are a known brand TRW.  not fakes. 

[Doctor Gollum]

Cheap discs, however branded all suffer to a greater or lesser degree. Either put up or replace

[omega2018]

out of interest assuming they are unevenly worn not warped by heat,  what is it about expensive discs that stops it happening?

and what prevents it ever wearing back to flat?

i had thought TRW were a good brand.