406 Coupe Brakes and Idling

| (ii) Brake vibration | On braking at higher speed the car vibrates quite badly. A Peugeot dealer | seemed to cure this by basically grinding down the front disks to even | them out. But, its back again. What could this be, and how would I cure | it?

If you drive the car particularly hard (ie. repeatedly jam the brakes on at high speeds) the heat when the pad touches the disc can cause some of the brake pad material to transfer to the disc and form a cementite. The outcome of this is that braking is uneven, particularly at high speeds where it feels bumpy. Eventually this becomes bad enough that the discs need to be ground down. This is what many mechanics have told me and seemed to hold true recently as a friend of mine burned the brakes out on his Honda S2000 after braking from (no doubt extremely) high speed!

Do a google on "disc cementite deposit" for more info.

Hope this helps.

Dom

Idling problem could be due to faulty ignition coils, might be since you had this since new, they have been replaced to a new model. This was the case of my 2001 at least. (there are 6 of them, so be aware of the bill ...)

I have noticed that the original disks are very sensitive to rusting, at least since I mosty use my Coupe out of the garage to wash it and back in againt ;) I think theese brakes are worse than others I have expirienced.

/Hazze

Flashster wrote:

Thanks guys. As I don't drive my coupe very hard at all, I guess it may be the rusting causing some pitting in the disk??

ii - Braking

Dont know if this is of any use, but did see somewhere that if you have an auto (dont know if you do) then holding the brakes on whilst at (say) a roundabout with the car in Drive will warp the discs, even after moderate braking. Apparently they are known for it.

Warped the discs in my 406 by braking from high speed, then holding on roundabout at end of m/way slip off ;-)

HTH

M@