Brake Judder SLK55 - Mercedes Benz SLK Forum

Tires, Wheels, Brakes & Suspension Discussion and information regarding tires, wheels, brakes and suspension.

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#1 Old 07-08-2015
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Cool Brake Judder SLK55

Hi all,
I have a slight Brake Judder when braking, it seems to be the Front Brakes.
Would Skimming the Discs help? There is a local Garage that can Skim the Discs on the car. The cost is around £50 - £80.http://www.skimmydiscs.co.uk/
Does anyone know the minimum thickness of the Disc?
Also what are the best Pads for normal driving?
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#2 Old 07-08-2015
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Cool Thickness

Found this in a Post
Measured my Disks and they are very good for thickness at nearly New size.
Very little Lip, I am now wondering if they are new'ish and were never Trued Up?

Front brake disks

New: 32mm
Wear limit: 30mm
wear limit for maintenance service: 30.6mm

Rear brake disks

New: 26 mm
Wear limit: 24mm
Wear limit for maintenance service: 24.6mm

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#3 Old 07-08-2015
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Try warming them up and then a few very hard stops - 70 to 0 .....

Failing that, a skim won't hurt ...

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#4 Old 07-09-2015
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Cheers Sean,
I have tried some heavy stops etc, trying to remove any glaze etc.
No real change. I have booked it in for Friday so will Post the results.

Cheers Russ


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#5 Old 07-09-2015
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If you have it booked in, then yes, wait and see why.
From a textbook angle, judder is due to disc run-out, thickness variation on the disc or caliper piston[s] sticking. Gas build up will also do it, but if you have drilled and vented discs, then unlikely.
Interested to see result.
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#6 Old 07-12-2015
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Cool Skim

Not had them done yet as they need to remove the Calipers,
They could not get the whole machine in.
Going back on Monday 20th for an on-car Skim and MOT.

It was a nice day, so the Dog and I walk to a Pub down by the Canal
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#7 Old 07-20-2015
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Cool Skim

Car has been dropped off this morning for a MOT and Disk Skim

Cheers Russ


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#8 Old 07-20-2015
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Thumbs up Done

No Judder As smooth as a babies bum.....
Passed the MOT and the guy looked all over it as he is interested in the car and says it looks perfect and is as tight as new.
I should have purchased new Pads.....
Can anyone recommend Front Pads for normal road use please?
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Cheers Russ


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#9 Old 07-20-2015
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Quote:
Originally Posted by RacingBlue View Post
No Judder As smooth as a babies bum.....
Great news!

Quote:
Originally Posted by RacingBlue View Post
Can anyone recommend Front Pads for normal road use please?
I'm still on whatever pads were fitted when I bought the car (probably OEM), but I'm sure I've read in several places that EBC red stuff pads are the way to go, especially if you want to reduce the amount of brake dust created:
• https://www.slkworld.com/tires-wheels...rake-pads.html
• https://www.slkworld.com/tires-wheels...-question.html

There are more threads out there too... search is your friend!
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• Recoding: 2 rear fogs; Outside temp in lower MFD; MPH-KM/H selectable speedo (thanks Sean!)
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#10 Old 07-20-2015
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Cheers Dave,
I searched ont Tinternet and EBC Yellow are recommended although they say for Road and Race.
I will look for Red ones.

Cheers Russ


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#11 Old 07-20-2015
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I've stuck with OEM pads .. they work for me, and the dust gets cleaned off when I wash the car!!
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#12 Old 07-20-2015
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Redstuff certainly for cleanliness, but they do require some effort at the pedal. Also you should match them at the back.
Yellowstuff is the one making its mark now - originally brought out for trackday, but getting a big following for daily drive use. I am using them and certainly a lot less effort than the Redstuff I am used to. Dust is ok - much less than OEM.
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#13 Old 07-20-2015
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Thank you,
I have been looking at Bedding in procedure and will try and do it correctly.
I have also contacted EBC for their recommendation.
If nothing comes of that I will put OEM on.
I can only assume that the Brakes where never Bedded in.
The Discs are 30.5mm thick even after the Skim.
I am away for a few days so the car will not be used so i have time to get some new Pads.

Cheers Russ


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#14 Old 07-25-2015
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Cool

This was the recommendation from EBC
EBC Brakes Yellowstuff Car Brake Pads 'Axle Set'

Cheers Russ


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