brake pedal vibration on w211
12-18-2003, 09:55 PM
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2007 E350 Sport
brake pedal vibration on w211
Every once in a while when I put my foot on the brakes, i feel vibration, as if something inside the system is moving. it seems to come on randomly and during various driving conditions (fast, slow, braking hard, or light, etc.). Initially, i thought it was ABS, or that brake pad drying feature, but it seems to also take place when the road is perfectly dry. Anyone else seen this? I have a service appointment in a couple of weeks, but i'm afraid it won't happen during the test drive. It's an '04 E320 with 400 miles. Thanks in advance.
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12-19-2003, 02:51 PM
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Could be just the SBC pump re-pressurising the system. The new E replaces the old vacuum assistance with an electronically controlled high pressure hydraulic system. I've read somewhere that you can sometimes feel a vibration when the pump is running.
12-20-2003, 03:02 PM
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Does it vibrate when slowing down?
If yes, you may have bad front rotors. A bulletin JUST came out addressing this. Special rotors that have thicker metal [smaller vent between them] to allow more heat transfer.
If yes, you may have bad front rotors. A bulletin JUST came out addressing this. Special rotors that have thicker metal [smaller vent between them] to allow more heat transfer.
12-20-2003, 03:13 PM
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it doesn't feel like that kind of vibration... it's more of a feeling of something getting recharged (like something is getting pumped into the system). i realize i'm not doing a good job explaining this :-)
12-20-2003, 03:15 PM
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Re: brake pedal vibration on w211
Originally posted by indus
Every once in a while when I put my foot on the brakes, i feel vibration, as if something inside the system is moving. it seems to come on randomly and during various driving conditions (fast, slow, braking hard, or light, etc.). Initially, i thought it was ABS, or that brake pad drying feature, but it seems to also take place when the road is perfectly dry. Anyone else seen this? I have a service appointment in a couple of weeks, but i'm afraid it won't happen during the test drive. It's an '04 E320 with 400 miles. Thanks in advance.
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Every once in a while when I put my foot on the brakes, i feel vibration, as if something inside the system is moving. it seems to come on randomly and during various driving conditions (fast, slow, braking hard, or light, etc.). Initially, i thought it was ABS, or that brake pad drying feature, but it seems to also take place when the road is perfectly dry. Anyone else seen this? I have a service appointment in a couple of weeks, but i'm afraid it won't happen during the test drive. It's an '04 E320 with 400 miles. Thanks in advance.
--
Last edited by Dr Chill; 12-20-2003 at 03:18 PM.
12-20-2003, 04:25 PM
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Originally posted by Karl
Does it vibrate when slowing down?
If yes, you may have bad front rotors. A bulletin JUST came out addressing this. Special rotors that have thicker metal [smaller vent between them] to allow more heat transfer.
Does it vibrate when slowing down?
If yes, you may have bad front rotors. A bulletin JUST came out addressing this. Special rotors that have thicker metal [smaller vent between them] to allow more heat transfer.
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12-21-2003, 03:44 PM
#8
There is a bulletin out that deals with this pedal vibration issue. The cause of the vibration is the SBC system building up pressure. The dealer can perform a modification to eliminate the vibration. It doesn't take long. Just ask your service advisor or shop foreman about it.
12-21-2003, 03:54 PM
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Originally posted by Petmerctech
There is a bulletin out that deals with this pedal vibration issue. The cause of the vibration is the SBC system building up pressure. The dealer can perform a modification to eliminate the vibration. It doesn't take long. Just ask your service advisor or shop foreman about it.
There is a bulletin out that deals with this pedal vibration issue. The cause of the vibration is the SBC system building up pressure. The dealer can perform a modification to eliminate the vibration. It doesn't take long. Just ask your service advisor or shop foreman about it.
12-22-2003, 08:55 PM
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Petmerctech, thanks for the info. That's exactly what it feels like - as if there is an air compressor building up pressure. If you could provide the specific bulletin information, it would be awesome. If not - not a big deal.
12-22-2003, 09:39 PM
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The bulletin on the new rotors is P-B-42.10/33 dated Dec 18, 2003. It starts out "If you receive customer reports in the above model vehicles of front wheel brake shudder during braking,..." keep in mind some people don't know the difference between brake shudder and pedal vibration. We deal every day with customers that won't or can't read an owners manual, or think that 'tire pressure control' will maintain the tire pressure [YES, this happens at least once a week!!], or can't understand why the dome light works in the garage but not out in the driveway during the day!
12-22-2003, 09:42 PM
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I tried to attach the bulletin but I could not..... it was rejected because it was over 1 byte. I tried to scan it as low as I can. It is 93KB.
If anyone wants it, I can pmail it. My address is aufever@prodigy.net
If anyone wants it, I can pmail it. My address is aufever@prodigy.net
12-23-2003, 08:28 PM
#14
I reviewed the bulletin today, indus. What the modification consists of is the addition of a pulsation dampener inline with the suction line of the SBC system. It is then wrapped in felt material to prevent any vibration against surrounding components. This involves cutting a length of hose from the suction line to facilitate room for the pulsation dampener. After the modification, the brake system is bled with the SDS. The whole process should take approximately one hour.
12-23-2003, 10:51 PM
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Petmerctech, thank you very much. Do you recommend that I get it done, is it too intrusive a procedure to get rid of a relatively minor annoyance?
12-23-2003, 11:03 PM
#16
Well that is a question that only you can answer. The modification isn't mandatory. It's just a solution to solve complaints from customers concerning the vibration caused by the SBC system pressurizing, which is normal. The modification certainly won't hurt anything. How annoying is it to you? If it were me, I'd have the modification performed. Now as to why MB didn't engineer this vibration out, I'm guessing it's for cost reasons or lack of development time. Also, I feel that the 211 was rushed to the market, with all the bulletins dealing with corrective measures on many issues.
12-24-2003, 01:03 AM
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So far 2 people have pmailed me for a copy of the rotor bulletin.
It surprised me that patrick was not one of them.....
If anyone has a website I could send it to, let me know.
On another subject, I noticed no one has mentioned the seat belt buckle recall that affects 203, 209, 211's. It only involves 9400 204 cars. I have had to fix 4 that we had in stock. Brand new recall, the info will not be officially released until after the 1st of the year.
It surprised me that patrick was not one of them.....
If anyone has a website I could send it to, let me know.
On another subject, I noticed no one has mentioned the seat belt buckle recall that affects 203, 209, 211's. It only involves 9400 204 cars. I have had to fix 4 that we had in stock. Brand new recall, the info will not be officially released until after the 1st of the year.
12-25-2003, 05:51 AM
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Originally posted by Petmerctech
I reviewed the bulletin today, indus. What the modification consists of is the addition of a pulsation dampener inline with the suction line of the SBC system. It is then wrapped in felt material to prevent any vibration against surrounding components. This involves cutting a length of hose from the suction line to facilitate room for the pulsation dampener. After the modification, the brake system is bled with the SDS. The whole process should take approximately one hour.
I reviewed the bulletin today, indus. What the modification consists of is the addition of a pulsation dampener inline with the suction line of the SBC system. It is then wrapped in felt material to prevent any vibration against surrounding components. This involves cutting a length of hose from the suction line to facilitate room for the pulsation dampener. After the modification, the brake system is bled with the SDS. The whole process should take approximately one hour.
12-25-2003, 01:14 PM
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Misunderstanding? No, it is DTB P-B-42.10/33 dated Dec 18, 2003.
It affects models 230.475 up to 04/30/2003 production, 220.170/175 up to 05/31/2003 production [except code 979], 215.375 up to 05/31/2003, and 211.065/070 up to 04/30/2003 [except code 979].
"If you receive customer reports in the above model vehicles of front wheel brake shudder during braking, replace the brake disks with revised parts. Brake disks may only be replaced in pairs.
NOTE: The brake shudder is the result of excessive thermal loads on the brake disk. The revised brake disks have a smaller cooling duct and therefore greater heat storage capacity"
I guess the misunderstanding here is that I thought you guys wanted the latest technical info from MB. But it appears like all you want is fluff BS like what color and options look the best or who gives the best service. I will keep my mouth shut and let you guys go back to discussing which dealer gave you a better wash job or put and extra mile or two on the roadtest.
It affects models 230.475 up to 04/30/2003 production, 220.170/175 up to 05/31/2003 production [except code 979], 215.375 up to 05/31/2003, and 211.065/070 up to 04/30/2003 [except code 979].
"If you receive customer reports in the above model vehicles of front wheel brake shudder during braking, replace the brake disks with revised parts. Brake disks may only be replaced in pairs.
NOTE: The brake shudder is the result of excessive thermal loads on the brake disk. The revised brake disks have a smaller cooling duct and therefore greater heat storage capacity"
I guess the misunderstanding here is that I thought you guys wanted the latest technical info from MB. But it appears like all you want is fluff BS like what color and options look the best or who gives the best service. I will keep my mouth shut and let you guys go back to discussing which dealer gave you a better wash job or put and extra mile or two on the roadtest.
12-25-2003, 02:16 PM
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Originally posted by Karl
Misunderstanding? No, it is DTB P-B-42.10/33 dated Dec 18, 2003.
It affects models 230.475 up to 04/30/2003 production, 220.170/175 up to 05/31/2003 production [except code 979], 215.375 up to 05/31/2003, and 211.065/070 up to 04/30/2003 [except code 979].
"If you receive customer reports in the above model vehicles of front wheel brake shudder during braking, replace the brake disks with revised parts. Brake disks may only be replaced in pairs.
NOTE: The brake shudder is the result of excessive thermal loads on the brake disk. The revised brake disks have a smaller cooling duct and therefore greater heat storage capacity"
I guess the misunderstanding here is that I thought you guys wanted the latest technical info from MB. But it appears like all you want is fluff BS like what color and options look the best or who gives the best service. I will keep my mouth shut and let you guys go back to discussing which dealer gave you a better wash job or put and extra mile or two on the roadtest.
Misunderstanding? No, it is DTB P-B-42.10/33 dated Dec 18, 2003.
It affects models 230.475 up to 04/30/2003 production, 220.170/175 up to 05/31/2003 production [except code 979], 215.375 up to 05/31/2003, and 211.065/070 up to 04/30/2003 [except code 979].
"If you receive customer reports in the above model vehicles of front wheel brake shudder during braking, replace the brake disks with revised parts. Brake disks may only be replaced in pairs.
NOTE: The brake shudder is the result of excessive thermal loads on the brake disk. The revised brake disks have a smaller cooling duct and therefore greater heat storage capacity"
I guess the misunderstanding here is that I thought you guys wanted the latest technical info from MB. But it appears like all you want is fluff BS like what color and options look the best or who gives the best service. I will keep my mouth shut and let you guys go back to discussing which dealer gave you a better wash job or put and extra mile or two on the roadtest.
I was curious about that bulletin because first it seemed to contain information about problems with the SBC-system that I was not aware of, but it did not.
The misunderstanding is that these two postings were not about one and the same bulletin:
Originally posted by Petmerctech
There is a bulletin out that deals with this pedal vibration issue. The cause of the vibration is the SBC system building up pressure. The dealer can perform a modification to eliminate the vibration. It doesn't take long. Just ask your service advisor or shop foreman about it.
There is a bulletin out that deals with this pedal vibration issue. The cause of the vibration is the SBC system building up pressure. The dealer can perform a modification to eliminate the vibration. It doesn't take long. Just ask your service advisor or shop foreman about it.
Originally posted by Karl Does it vibrate when slowing down?
If yes, you may have bad front rotors. A bulletin JUST came out addressing this. Special rotors that have thicker metal [smaller vent between them] to allow more heat transfer.
If yes, you may have bad front rotors. A bulletin JUST came out addressing this. Special rotors that have thicker metal [smaller vent between them] to allow more heat transfer.
12-25-2003, 08:30 PM
#22
Originally posted by Karl
Misunderstanding? No, it is DTB P-B-42.10/33 dated Dec 18, 2003.
It affects models 230.475 up to 04/30/2003 production, 220.170/175 up to 05/31/2003 production [except code 979], 215.375 up to 05/31/2003, and 211.065/070 up to 04/30/2003 [except code 979].
"If you receive customer reports in the above model vehicles of front wheel brake shudder during braking, replace the brake disks with revised parts. Brake disks may only be replaced in pairs.
NOTE: The brake shudder is the result of excessive thermal loads on the brake disk. The revised brake disks have a smaller cooling duct and therefore greater heat storage capacity"
I guess the misunderstanding here is that I thought you guys wanted the latest technical info from MB. But it appears like all you want is fluff BS like what color and options look the best or who gives the best service. I will keep my mouth shut and let you guys go back to discussing which dealer gave you a better wash job or put and extra mile or two on the roadtest.
Misunderstanding? No, it is DTB P-B-42.10/33 dated Dec 18, 2003.
It affects models 230.475 up to 04/30/2003 production, 220.170/175 up to 05/31/2003 production [except code 979], 215.375 up to 05/31/2003, and 211.065/070 up to 04/30/2003 [except code 979].
"If you receive customer reports in the above model vehicles of front wheel brake shudder during braking, replace the brake disks with revised parts. Brake disks may only be replaced in pairs.
NOTE: The brake shudder is the result of excessive thermal loads on the brake disk. The revised brake disks have a smaller cooling duct and therefore greater heat storage capacity"
I guess the misunderstanding here is that I thought you guys wanted the latest technical info from MB. But it appears like all you want is fluff BS like what color and options look the best or who gives the best service. I will keep my mouth shut and let you guys go back to discussing which dealer gave you a better wash job or put and extra mile or two on the roadtest.
Who ever mentioned anything about "fluff BS stuff like what color, options, look the best or who gives a better car wash blah blah blah blah......
Oh yeah, only you did, but why you did, I have no clue.This whole thread concerns the SBC system pressurizing and causing a vibration through the brake pedal. Indus already stated in his second post that it doesn't feel like a warped rotor vibration but like something is being recharged. You're the one that went off and gave misleading info about warped rotors blah blah blah blah.... so it's you who has a misunderstanding.
Last edited by Petmerctech; 12-25-2003 at 08:34 PM.
12-25-2003, 08:49 PM
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Karl, while there is a lot of "fulff" on these forums, I think this particular forum is for "latest technical info", and I found your information, as well as Petmerctech's, extremely useful, though in my case the problem Petmerctech is describing is the pertinent one. I am not really sure what set you off in this particular case, but I, for one, would like you to continue to offer your technical expertise.
12-26-2003, 04:55 PM
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Patrick - i am not sure what hose modification you are reffering to, but I'm pretty sure what I am experiencing is SBC system pressurizing that Petmerctech was describing. Refer to earlier in the thread for the info.
