964RS discs warped already!?

[escobar]

Had all of the discs changed last year and I am getting a lot of judder through the steering wheel when breaking from speed.

Pretty sure I have a disc warped but am very suprised as I have only done around 2,000khm on them and no track days or extensive hard breaking.

Could I have a rouge disc that has warped already?

[johnny g-pipe]

A rouge disc? is that french for big reds?

Might be pad deposits on the discs..try an 'italian tune up'. A track day or some extensive hard braking might just do the trick...

>> Edited by johnny g-pipe on Monday 8th May 23:18

[andrew medway]

escobar said:

Had all of the discs changed last year and I am getting a lot of judder through the steering wheel when breaking from speed. Pretty sure I have a disc warped but am very suprised as I have only done around 2,000khm on them and no track days or extensive hard breaking. Could I have a rouge disc that has warped already?

I had a judder on my 996TT. The discs were only 2.5k old. I put a post on here and was told I had probably got a rough spot on them caused by the car being put away with damp / wet discs. The discs dont dry very well close to the calipers and pot the surface with corrosion.

The advice I got was to take the motor out and drive it hard and specifically to do some hard, but consistant (i.e. 5 second +), burst of braking and smooth them off. It has worked. I dont know if it would work for you, but might be worth a try.

[johnny g-pipe]

Andrew - snap!

[andrew medway]

johnny g-pipe said:

Andrew - snap!

But I used a lot more words...

[joe911]

First, apparently, disks do not warp - (I'll look out the link later).

What pads/disks are you using?

Were the pads bedded in correctly?

Are you being careful not to apply the brakes (say to hold the car at a traffic light) when they are hot - this will cause problems?

Have you tried to correct the problem (by driving the car) - I was told how to, and for me it worked?
In my case I was at the Ring and I was told to do a mad lap braking really hard for 3/4 of the lap - then complete the lap, at speed, but without touching the brakes. I think the idea is that the really hard braking gets everything really hot and the deposits will then be cleaned off - and then the proper cooling allows things to get down to a sensible temperature without deposits accumulating. Worked a treat.


>> Edited by joe911 on Monday 8th May 23:28

[Ian964]

Steering judder when braking is also a symptom of worn front wishbone bushes.

[escobar]

I am running standard discs and pads.

The breaks have only been used lightly and are being run in along with my engine after its Top End Rebuild...so nothing daft been done.

I had heard that some hard breaking can bring them back, is this true?

[Joe911]

escobar said:

I had heard that some hard breaking can bring them back, is this true?

It has worked for me. Some brakes require bedding in quite aggressively (several big stops in a row from high speed - be sure to let them cool down without the pads resting on the disks) - being gentle on them from new is not typically a good idea.