Steering wheel vibration

[Neil]

Im getting serious vibration from the steering wheel whenever I start braking at high speeds (70+mph)... very very shakey.

Anyone know whats causing this, or better yet how to stop it??

I just had the wheels balanced when I put on the Kosei's so thats not it... time to upgrade the brake pads/discs maybe..?

[Myfeckin FTO]

Im getting serious vibration from the steering wheel whenever I start braking at high speeds (70+mph)... very very shakey.

Anyone know whats causing this, or better yet how to stop it??

I just had the wheels balanced when I put on the Kosei's so thats not it... time to upgrade the brake pads/discs maybe..?

Sounds like you've got some warped front disc's - well when I say warped more likely you have some deposits on the discs that are causing the pads & calipers to vibrate - Most guys call this warped discs - but its unusual that the discs would actually warp. The Tiptronics tend to be harder on their brakes as well for obvoius reasons.

You could skim the discs - or maybe try braking hard a few times to knock the crap thats presently on the discs - or you could buy yourself some nice drilled discs from Camskill and upgrade the pads while you're at it.

[AL]

before you do anything, check the front tyres, see if there is uneven wear , ie tyres with more wear on inside, if this is the case then you will need to get the tracking done, if tracking is ok then check run out on discs.

[Neil]

Brand new tayo tyres so that cant be it.. its been like this since I bought it pretty much but I thought the wheels + tyres + balancing would do it.
Now im thinking it is that the discs are warped.

Is skimming actually worth it? Is it effective like? As in, will they not just warp again a while later...??

Well tempted to buy a good set of aftermarket discs, only i didnt budget for this

[CJ]

Is skimming actually worth it? Is it effective like? As in, will they not just warp again a while later...??

Some people swear by it, its not an expensive task to undertake and it would be worthwhile doing if you don't want to shell out on a new set of disks. In saying that, its most likely that the disks are glazed with pad material. When I got my GPX, it had a brand new set of standard disk on the front, the previous owner had put on a set of Black Diamond drilled and x-grooved disks that had become 'warped' so he stuck on the new standard set. Not to be outdone, I stuck the old BDs back on with a new set of Pagid pads and took the car out for a spin (after bedding in the pads that is). I took the car up a quiet 'private road' and undertook some high speed braking from 90MPH down to 10MPH (3 or 4 times). Low and behold, the 'warped disks' were no more, the hard braking had removed the glazed pad material and sorted out the juddering on braking. If you do a lot of city driving, especially in a Tip, you'll find that the disks glaze over a lot easier.

To summerise, you have the option of trying the latter mehod first and then skimming if all else fails.

CJ

[AL]

if you end up going down the road of skiming, first measure thickness of disc with a vernier calipers then refer to lower limit of allowable thickness on manufacturers handbook, aim for "at least" the midpoint when gettin them skimmed, if this is not possible, i personally wouldnt bother machining