?warped disc from corrosion

[drchris]

Hi all,

I've got new brakes on my 3series. I had the discs and pads all round changed about 3000 miles ago and have now developed a significant wheel wobble on the front. It was initially under all driving but since having my fronts balanced it is only under braking. At high speed I can feel the steering wheel vibrating in my hands, at low speed I think I can feel uneven grip on the brake (although I could be imagining this!) The car stops efficiently, there are no unusual noises and it pulls to stop in a straight line.

The new discs are pagid OEM equivalent fitted by Forza West who have done all my servicing for over 2 years. They have had a look at it today and reported that the discs are suffering from premature corrosion from being stood in wet weather, with marks left where the pad approximates to the disc when at rest. Apparently this is a known issue with some pagid discs but my chance of warranty replacement is slim based on previous experiences... I have done 3000 miles in 3 months so the car isn't exactly underused and certainly no less than with the previous set of discs/pads.

Anyone got any experiences to share? I'm hoping Stuart will be able to fix this for me without additional expense but am in the waiting stage currently...

Cheers,
Chris

[Prof Prolapse]

I'd be taking it back no bother. A disc that can't be sat in the wet is not fit for purpose.

I am always suspicious of "disc warping" though as I think in most cases it's just deposits on the discs which can be removed with a bit of wet and dry or at worst a skim.

[steveo3002]

i get this were my car stands around alot , a quick scrub to remove the worst of the mark with some sandpaper , then some hard braking seems to sort it

[GAjon]

You can't get anymore average than 12000 mls a year, if they can't do that there not fit for purpous!

[DocJock]

I'm struggling to see how some surface corrosion of a cast iron disc could 'warp' it.

AT worst you';ll have some transient surface oxidation which will, as has been said already, will be removed after a couple of hard stops.

[98elise]

GAjon said:

You can't get anymore average than 12000 mls a year, if they can't do that there not fit for purpous!

This, its pretty much bang on average car use.

[4key]

How would getting a disk wet warp it? I can understand a less than perfect surface on a car that spends a lot of time sitting around, but not on one thats done 3k in 3 month.

Pics?

[Mr2Mike]

It's unlikely to be warped, though the disc may not be seated square on the hub if the fitter didn't clean up the faces sufficiently.

If it's just an uneven layer of corrosion, try a drill mounted flap wheel to remove it.

[drchris]

It doesn't appear warped and the is nothing really to see so (for once) pics aren't going to help :-(

I wondered if maybe the disc isn't sat flush to the hub? Could that do it? Makes sense to me. As people have said, my mileage is bang on average, although it tends to be 300 miles at weekends with nothing between rather than daily driving.

I'll wait with expectation for a set of replacements hopefully!

Edit - as above!