Juddering when breaking...?

[nick_is_home]

When Breaking in my 4.2 R-reg Cerb I get a fairly obvious juddering on the steering wheel. The car breaks fine and in a straight line.

Is this normal or are the disks warped or something?
The car has just had a 12k service and had the disks skimmed could the dealer have done a bad job at skimming???

(BTW - just got the car and the previous owner did the service. I would use a specialist over a dealer)

Thanks for all the help
Nick

[grey42cerbie]

What are your tyres like? It could be flat spots or something. I had this problem until I changed the front tyres. I didn't discover this until after I'd changed the disks first, DOH!

Cheers, Steve
Grey 4.2 Cerbie

[nick_is_home]

I doubt it is these as they were changed at the service (about 400 miles ago...)

I will check though as it is possible they have been damaged since then.

Thanks
Nick

[madasahatter]

Could be balancing of the wheels, or tracking out as well, but the most likely culprit is the disks being warped - or not skimmed properly.

The symtoms of warped disks as seen by myself recently, and also by others seems to be these...

1). When cold, the juddering doesn't exist. First few brake applications seem fine
2). As brakes warm up the "judder" gets worse.
3). Manifests as very sharp vibration through the steering
4). Can go away when the brakes are used firmly.

I hope it is the cheaper solution for you, but fear the worst (replacement disks).

Steve

[p7ulg]

Interested to hear about the discs being skimmed when it went in for a service.This was also done to mine even though I had experienced no problems with them !
Is this common practice?

[madasahatter]

I think it is common practise, just as long as the disks are quite new, and there is plenty of material to go at.

[nick_is_home]

I think it is common practise as it is far cheaper than replacing the disks.

Yours would have been done as they were probably worn and grooves were probably forming on the disk due to general wear. By skimmng the disk you smooth it out and improve the braking e.t.c....

L8rz
Nick

[phockit]

madasahatter said: Could be balancing of the wheels, or tracking out as well, but the most likely culprit is the disks being warped - or not skimmed properly.

The symtoms of warped disks as seen by myself recently, and also by others seems to be these...

1). When cold, the juddering doesn't exist. First few brake applications seem fine
2). As brakes warm up the "judder" gets worse.
3). Manifests as very sharp vibration through the steering
4). Can go away when the brakes are used firmly.

I hope it is the cheaper solution for you, but fear the worst (replacement disks).

Steve

Very accurately reflects the symptoms I had, both times the disks went (second set lasted 2k miles of normal road use). In the end I have had a later revision of disk fitted, identifiable by having black rather than silver hubs. Been fine since.

[tvrslag]

When Breaking in my 4.2 R-reg Cerb I get a fairly obvious juddering on the steering wheel. The car breaks fine and in a straight line.

Is this normal or are the disks warped or something?
The car has just had a 12k service and had the disks skimmed could the dealer have done a bad job at skimming???

(BTW - just got the car and the previous owner did the service. I would use a specialist over a dealer)

Thanks for all the help
Nick

Nick, Have had the same problem with my 96 4.2 which I just brought privatly. I also considered warped discs but the Service history showed new discs only 3000 miles previous. I took the car around to a local expert who checked it out, replaced the pads and they traced the main default to a loose suspension bolt on the hub which was allowing the hub assembly to judder under heaving braking. Braking is now vastly improved with only a very fine judder due to slight wheel inbalance.