Brian k
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I use the hold function all the time too and have never had brake judder. Maybe I’m just lucky.
Brake Hold Function! Hidden Options!
- Thread starter Gav78
- Start date
Maybe I'm just unlucky.
It's never juddered under firm braking, but light braking from 70-50mph it was awful at times, plus when just creeping along in traffic I could feel the brakes doing a sort of grab and release even with a fixed input on the brake pedal. It doesn't do any of that now.
The Hold function was/is very useful, might try using it again and see if the juddering returns.
TheFoX
Active Member
I never need the HOLD function which makes me even luckier than you. Probably because I live somewhere where there is very little hold up.
bluestreak
Active Member
I had a rental w213 e220 with juddering brakes. Very similar symptoms. To me it felt like a slightly warped disk. I'm not sure if hold function was to blame but holding hot pads against the disk can create a hotspot. I wouldn't stand on the brakes for that very reason.
I tried hold function on my car today and was surprised by how hard you have to mash brake pedal to activate it. It is easily 5x of my normal effort. I only hope this doesn't translate into actual hydraulic pressure... Hold is not for me.
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You are doing it wrong, you just have to tap the brake pedal while stationary and it will hold.
bluestreak
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Why would the HOLD function cause brake judder? What’s the difference between the HOLD function and you holding the brake with your foot? 
grober
MB Master
I think its more to do with the speed you apply the brake pedal rather than the force- a rapid tap does the job rather than a slower application using great force. These new intelligent braking systems can anticipate braking requirements. [BAS] At higher speeds if the system anticipates from pedal movement that a greater braking effort will be required it boosts the brake application force independent of pedal pressure to maximise braking effort. I reckon its the same "pedal speed" facility the system uses on both occasions .thanks, I'll stick L plates and try again tomorrow
Pickup on the discs is possible particularly if non standard MB pads are used but another possible candidate are sticky calipers. IIRC most Mercedes have sliding calipers on all 4 wheels, not sure on the E63? If the caliper movement on its pins were to be stiff through lack of grease this might be enough to give a similar effect?
BAS =brake assist system
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I too don't quite get it and was convinced that the discs were warped. However after reading the thread that I linked above (page 1), and then taking the actions I've described, the brake judder problems have gone away...Why would the HOLD function cause brake judder? What’s the difference between the HOLD function and you holding the brake with your foot?
Clearly it's not an issue for everyone, but did/does apply to our car and from what I can see from threads on this forum, is not an isolated case.
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Good luck.thanks, I'll stick L plates and try again tomorrow
Andyfkettle
Active Member
Used hold function with no issues so far but only tend to use it when brakes are cold either from a long run or just pottering into town.
french
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Ditto...I'm not so keen on the auto braking ,where you actuate it by pulling cruise stalk towards you, feels as the brakes are dragging when thats on.
CaptainChaos
MB Enthusiast
Warped disks can occur on any car. It’s certainly not specific to the Mercedes hold function.
It’s usually caused by keeping the brakes on after heavy braking. For instance coming off a motorway junction and braking hard for the roundabout. It can be eliminated by making sure you leave some extra space after your big stop to roll forward before finally coming to a halt.
If the bulk of your driving is urban, it’s unlikely to cause you a problem.
It’s usually caused by keeping the brakes on after heavy braking. For instance coming off a motorway junction and braking hard for the roundabout. It can be eliminated by making sure you leave some extra space after your big stop to roll forward before finally coming to a halt.
If the bulk of your driving is urban, it’s unlikely to cause you a problem.
Don't think the issues we've experienced with our S205 were down to warped discs. Have had those before and they don't go away with a few firm braking events.
Even though i'd not come across the pad material transfer idea before, that does stack up with our experience in this car. Thanks for the driving tips, I'll have to bear that in mind next time i'm out and about.
CaptainChaos
MB Enthusiast
Yes, it may well be pickup from the pads but it will be caused by the same thing. One big stop and then holding the pads against the disk.
An extreme example is if you go on a track day and they will advise you not to use the handbrake when you come into the pits. The reason is that on a track your rear brakes can get hot - much more than usual road driving - and if you have the type of handbrake which acts directly onto the rear disks, you can stick the pads to the disk...!
An extreme example is if you go on a track day and they will advise you not to use the handbrake when you come into the pits. The reason is that on a track your rear brakes can get hot - much more than usual road driving - and if you have the type of handbrake which acts directly onto the rear disks, you can stick the pads to the disk...!
We are both pretty light on the brakes generally and hadn't really done any big stops in the car when the juddering first appeared, but I take your point. If I could be bothered, I'd change the pads (and maybe discs). As it is the braking is fine now that we stopped using Hold, which might be some sort coincidence though with what I'm not sure.
bluestreak
Active Member
They should have put "hold" function on a button, that's all i'm saying .....
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What, like an electric handbrake??
bluestreak
Active Member
why not? They should copy Audi's. They copied iPod instead with brake pedal action, not good...
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