Brake judder only under heavy fast load

[Stevie A]

190E 2.6

I get brake judder which feels like it comes from the front and this is not noticable at speeds about 60mph or below. The judder has happened twice, once when slowing down from 100 at a roundabout and once when doing about 80 down a hill and slowing down.

I suspect maybe a distorted disc after reading Haynes manual. Would worn pads cause this? Any ideas appreciated. I am going to have a proper look at weekend. If distorted disc - is it just a case of spinning hub and looking if it is straight?

 

[psmart]

Have you parked up for a while? A fault with the new brake compound is the have an acidic base and if you park up for a few days/weeks, especially after rain, the pads etch into your discs, causing brake judder. If its this fault, need to skim or replace the discs and possibly pads.

 

[davidash]

Hi, You do not indicate your mileage. It would be useful. Generally, the discs do not last for ever and I would suspect you need to replace them. The agents will tell you the minimum thickness required for the discs. If they have worn too much it is not possible to skim them. If you are able, it is probably worth just changing the discs.

 

[panzermk6]

You need new discs.The harder you break,the more judder you'll get.

 

[hawk20]

Sure it's not the ABS cutting in??????

 

[Blobcat]

Sure it's not the ABS cutting in??????

ABS you will feel as a pulsing through the pedal. Judder you will feel through the steering wheel / seat.
As above I would get the disc's checked/changed

 

[Stevie A]

Cheers for feedback. I'm going to check discs etc at the weekend. I know the discs were replaced before I got the car around end of 2003 as I found a receipt in the car. I think a disc is probably distorted.

 

[turnipsock]

You need new discs.The harder you break,the more judder you'll get.

I'd agree with that. I fitted new pads and noticed that the disks were pretty bad. The brakes now judder evey time I use them. If I replace the disks, I'll have to buy new pads and junk the new pads I have just fitted. I'm going to tough it out till I need new pads again.

The judder is really bad around 120mph.

 

[oigle]

If your shudder has only happened a couple of times as you state, I would discount discs etc. If the discs were distorted/damaged etc, the shudder would occur pretty much every time the brakes were used. I go with the possibility of actuating the ABS - 100 coming to roundabout etc sounds like heavy braking. Shudder from ABS can be confusing to someone unaccustomed to the experience.

 

[clive williams]

I'd agree with that. I fitted new pads and noticed that the disks were pretty bad. The brakes now judder evey time I use them. If I replace the disks, I'll have to buy new pads and junk the new pads I have just fitted. I'm going to tough it out till I need new pads again.

The judder is really bad around 120mph.

Turnipsock,

Fit the new discs and sand down the pads. The pads can be sanded down on a sheet of sandpaper placed flat on a sheet of glass. Take enough material off to get a smooth flat finish of even thickness. Don't obviously go below minimum thickness and check the wear periodically.

The reasoning behind 'new pads on new discs' is usually the old disc face is not flat or is grooved etc and these shapes translate to the pad. If you sand out these shapes then it is as good as a new pad, save for the reduction in thickness.

it'll be worth doing only if there is sufficient meat left in the pad after sanding. Bear also in mind that pads are really quite cheap anyway.

Clive

500E
E320CDIT210

 

[Stevie A]

I'd agree with that. I fitted new pads and noticed that the disks were pretty bad. The brakes now judder evey time I use them. If I replace the disks, I'll have to buy new pads and junk the new pads I have just fitted. I'm going to tough it out till I need new pads again.

The judder is really bad around 120mph.

Glad to see somebody is going faster than me and getting judder.
I will report back when I look at the discs.