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        General >> Give/Need advice to/from others >> Judder on steering under braking!
        
(Message started by: harry.m1byt on Sep 16^th, 2007, 5:11pm)

Title: Judder on steering under braking!
Post by harry.m1byt on Sep 16^th, 2007, 5:11pm

Hi all,

There has been an interesting thread about brake judder and disk distortion on u.r.c.m.. Someone suggested a URL for a site http://www.stoptech.com/tech_info/wp_warped_brakedisk.shtml
which discusses in some detail problems with distortion on brake discs and judder.

My car suffered alarmingly from judder on the steering when the brakes were applied at around 50mph, when I first got it. I eliminated almost all of it by changing the wish bone rear bushes some months ago, but the juddering gradually came back - not as bad as before, none the less I wanted it sorted. I was on the point of ordering some new disks, when I read the above URL.

It seems that if you brake hard then leave the brakes on after you stop, then pad material can stick to the disk causing judder.

Based on that information, I took the Scorp out today to test out the theory. I got the speed upto 70mph and applied the brakes hard, on a dry road I could feel the ABS cutting in. I repeated the process several times over, with a minimum amount of time lost between the braking sessions, but never actually coming to a stop.

The heating up of the disk and hard use is supposed to clean the disk up and relieve the stresses out of the cast iron disk.

My brakes are now almost completely judder free again. There is just the slightest trace of judder when the brakes are first applied, which dissappears as the brakes come into operation.