Warped discs

[rocket]

About 3000 miles ago I replaced the front discs on my Cerb ('98 4.2) as they were warped and I was getting break judder. Now I've noticed that I'm just starting to get minor judder from the new ones.

Is this likely to be due to overheating, as mentioned in the Cerb article in this month's Sprint? I've not done any track work, just 'regular' driving. If it is overheating, are there vented discs you can get for the standard 16" wheels?

Or could it be something else....warped hubs perhaps...any other suggestions...ideas of costs etc?

Many thanks,

Neil

[anonymous-user]

I got the new Tuscan vented disks fitted on my Cerbera, they're far better than the standard ones that were originally fitted. (I've still got 16' wheels).

[mike_e]

Try getting the disk faces cleaned up. Costs about £30, you'll probably find the problem has gone away. This means your disks aren't warping and the problem would then be due to pad residue sticking to the disk surfaces. (Do you sit in traffic with hot brakes and foot on the pedal?) Worth a try, far cheaper than new disks.

Mike

[GreenV8S]

I think there is a genuine disk warping problem with the Cerbera brakes, but talk to somebody like Joolz if you want to find out for sure. There's an interesting paper here www.stoptech.com/whitepapers/warped_rotors_myth.htm which explains some other related problems which are often confused with warped disks.

[rocket]

Cheers guys. Interesting article that Peter...must keep a note of that one.
As for sitting in traffic with hot brakes and foot on the pedal, hmmmmm, must admit I do that a lot (mainly due to the rather feeble TVR handbrake). Sounds like I should get the discs skimmed, and then avoid that particular habit in future.....see how it goes from there.

Thanks again,

Neil

[buster]

I had the drilled tuscan discs fitted -

Much less prone to warping in my opinion - coped with track use well enough.

Looked nice too

[gazzab]

the Tuscan S discs seem like a good upgrade for 4.2 and speed six discs. There are views that they arent the best avail and that other deals, particularly on 4.5s, are better. BUT they are considerably cheaper than other deals. Think they are £100 plus VAT per disc. The standard 4.5 front discs are £400 each!!
Upgraded front discs are about £300 each.
I think you have to be careful which pads you select if you go for Tuscan S discs as these can affect the likelihood of cracking.

[VYT]

My 4.2 developed a slight judder which soon became a distinct pull to the left.
I saw that the right disk was grey rather than shiny so took a look at the pads. I found that the outer right pad was squiff in the caliper. Spent an evening getting the pads out as they appeard to be too long to fit the calliper. Got some replacements and they did't seem to fit either. I took a file to the steel back plate of the pads and found some pretty bad burrs under the paint, (EBC Green Stuff Pads), tidied up the ends to give a nice flat surface and the pads slotted in fine and clipped into place with only a light push.
Have covered 2000 miles since and done a track day the brakes are excellent. No judder, no pull, good bit of squeal though.
Looking at the calliper, the pads seem to locate on steel shims. Those shims don't look very precise so I think my old pads would not slide in the calliper. When the old pads came out they were 1/2 worn at one end and hardly touched at the other. Wonder if that contributes to warping the disks?
I have individually fitted each pad to the calliper and the brakes are awesome compared to how they were easily better than the T350 I took for a test.

Anybody else had similar problem?

[tvrslag]

Just to p@ss everybody off, I have a friend who is ex AP racing and still has contacts.
The upshot is a full set of AP racing formula disks for .......................................FREE!!
(well perhaps a crate of larger)
Can't get any better than that.
Now I just have to work out how to get the bloody things to stop squealing, when I brake (irrespective of speed) it sounds like every mouse ever born is being tortured under my wheelarches. Any thoughts? I have heard chamfering the leading edge of the pad can help. I am currently using standard OE pads.
Any recomendations on other makes of pad. I have done some circuit work but would like a bit more bite for "push on motoring"