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2012 C4 Grand Picasso o/s/f warped disc problem.

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mikerobpen   
Tue May 22 2018, 05:10am
Member No: #51238
Joined: May 22 2018
Location: kent
Hi guys, i have a recurring problem. The o/s/f brake disc keeps warping. I have replaced the caliper twice and the problem returns each time. Could there be another cause? A sticky brake balance valve or something like that? Any help gratefully received.
wozza   
Thu May 24 2018, 06:23am

Member No: #2
Joined: Aug 12 2006
Location: Manchester
Truly warped discs are actually quite a rare thing. It’s a bit of a myth and is often something else. Not properly torqued to the hub or fitted perfectly flat to the hub, pad transference, a sticking calliper.

You really need to strip it all down. Clean the hub and if you never changed pads. Change them as well.

Can be down to driving style if you sit with your foot on the brakes at lights etc.

There are so many causes for pedal judder. Could even be the hub itself.
1 User said Thank You to wozza for this Post :
 BigJohnD (24 May 2018 : 06:43)
TriumphGuy   
Tue Jul 10 2018, 06:59am
Member No: #47272
Joined: Jan 13 2017
Location: Halifax, West Yorkshire
It is essential that the mating surfaces between the disc and hub are clean. if there's any grit or rust the disc won't sit straight and could possibly be causing the "warping". What condition are the brake pads in? Any uneven wear could point to this problem.
 

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