Excessive Rolling in park
07-27-2016, 10:33 PM
#1
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2012 C63 AMG DP
Excessive Rolling in park
Ok Guys, I need some help here.
2012 C63 AMG Coupe.
So, the dealership found a leak in my rear axel, and it was completely replaced under warranty.
So, right after I get the car back, I notice that after stopping, the car rolls. Before, after stopping, putting in park, it never seemed to roll. it kind of "bounces" and even though I know its not a lot, its feels like a much older car that's poorly made.
i live in GA and it's mostly flat. I do not believe Ive used my E-brake more than 2 or 3 times on a driveway or whatever.
Dealership says parking post is Fine. E-Break is like new - but this rolling is so Irritating. I hate having passengers because when we stop, its really noticeable and you just don't expect that from this car.
The dealership says its working like all the other ones and its no big deal - and i hold that before they did the replacement, it stopped and Stayed stopped. and now - it doesnt.
Any helpful advice I can either arm myself to confront the shop or deal with reality would be helpful.
its bad enough that I want to get rid of the car because of it... and I Freaking Love this car...
Thanks
2012 C63 AMG Coupe.
So, the dealership found a leak in my rear axel, and it was completely replaced under warranty.
So, right after I get the car back, I notice that after stopping, the car rolls. Before, after stopping, putting in park, it never seemed to roll. it kind of "bounces" and even though I know its not a lot, its feels like a much older car that's poorly made.
i live in GA and it's mostly flat. I do not believe Ive used my E-brake more than 2 or 3 times on a driveway or whatever.
Dealership says parking post is Fine. E-Break is like new - but this rolling is so Irritating. I hate having passengers because when we stop, its really noticeable and you just don't expect that from this car.
The dealership says its working like all the other ones and its no big deal - and i hold that before they did the replacement, it stopped and Stayed stopped. and now - it doesnt.
Any helpful advice I can either arm myself to confront the shop or deal with reality would be helpful.
its bad enough that I want to get rid of the car because of it... and I Freaking Love this car...
Thanks
07-28-2016, 12:31 AM
#2
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You make it sound like if you pull into a parking spot with a car in front of you, put it in park, you'll roll a foot forward and hit the other car...
How far are we talking? Mine will do it from time to time too, it's not a big deal
How far are we talking? Mine will do it from time to time too, it's not a big deal
07-28-2016, 11:53 AM
#3
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Wow. I can see why you selected the user name "Never Settle". I don't recommend marriage lol.
If where you live is mostly flat, you don't even need the damn brake. If you are on a hill, there will sometimes be a small amount of roll, as in inches, for it to engage. Thats how those brakes work. Always have, whether you noticed it or not.
If where you live is mostly flat, you don't even need the damn brake. If you are on a hill, there will sometimes be a small amount of roll, as in inches, for it to engage. Thats how those brakes work. Always have, whether you noticed it or not.
07-28-2016, 08:18 PM
#6
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I park on a slight incline (underground parking garage) and the car rolls back slightly after putting it in park and letting off the brake. only real solution is to use the parking brake. I use it when parking on inclines elsewhere, but at home I cant be bothered i suppose!
07-28-2016, 08:32 PM
#7
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Automatic transmissions have a parking pawl that engages a gear to hold the car when in park. Sometimes the pawl engages into one of the detents on the parking gear, other times it hits the top of the gear tooth. When this happens, there is a small spring that pushes the pawl into the gear, but it can't engage until the car actually rolls a little ways. If you listen carefully you will hear a click as the parking pawl engages the gear.
But you said it rolls excessively. If the car moves more than 6 inches before you hear the click and it stops the car, I'd get the car looked at.
But you said it rolls excessively. If the car moves more than 6 inches before you hear the click and it stops the car, I'd get the car looked at.
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07-29-2016, 09:15 AM
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Jag F-Type V8
Automatic transmissions have a parking pawl that engages a gear to hold the car when in park. Sometimes the pawl engages into one of the detents on the parking gear, other times it hits the top of the gear tooth. When this happens, there is a small spring that pushes the pawl into the gear, but it can't engage until the car actually rolls a little ways. If you listen carefully you will hear a click as the parking pawl engages the gear.
But you said it rolls excessively. If the car moves more than 6 inches before you hear the click and it stops the car, I'd get the car looked at.
But you said it rolls excessively. If the car moves more than 6 inches before you hear the click and it stops the car, I'd get the car looked at.
07-30-2016, 04:46 PM
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07-31-2016, 03:21 PM
#11
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07-31-2016, 07:33 PM
#12
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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Totally agree ^
I'd only use it if parked on a hill, which I haven't been yet and don't forsee it happening.
I'd only use it if parked on a hill, which I haven't been yet and don't forsee it happening.
07-31-2016, 07:37 PM
#13
For me - I use it for the added safety, and - while I'm not sure if it still happens in modern vehicles - I have heard of the parking pawl damage and failure when used solely.
To quote the Wikipedia page on 'Parking Pawl':
Most vehicle manufacturers[3] and auto mechanics[4] do not recommend using the transmission's parking pawl as the sole means of securing a parked vehicle, instead recommending it should only be engaged after first applying the vehicle's parking brake. Constant use of only the parking pawl, especially when parking on a steep incline, means that driveline components, and transmission internals, are kept constantly under stress, and can cause wear and eventual failure of the parking pawl or transmission linkage. The pawl might also fail or break if the vehicle is pushed with sufficient force, if the parking brake is not firmly engaged.
I also grew up driving manual transmissions, so it's a bit of a habit. In my 20+ years of owning my own vehicle, and always using parking brakes I have never had a problem with rear brake warpage.
To quote the Wikipedia page on 'Parking Pawl':
Most vehicle manufacturers[3] and auto mechanics[4] do not recommend using the transmission's parking pawl as the sole means of securing a parked vehicle, instead recommending it should only be engaged after first applying the vehicle's parking brake. Constant use of only the parking pawl, especially when parking on a steep incline, means that driveline components, and transmission internals, are kept constantly under stress, and can cause wear and eventual failure of the parking pawl or transmission linkage. The pawl might also fail or break if the vehicle is pushed with sufficient force, if the parking brake is not firmly engaged.
I also grew up driving manual transmissions, so it's a bit of a habit. In my 20+ years of owning my own vehicle, and always using parking brakes I have never had a problem with rear brake warpage.
Last edited by looney100; 07-31-2016 at 07:39 PM.
07-31-2016, 07:54 PM
#14
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I was a transmission engineer for a major auto mfr. I know exactly the ins and outs of the parking pawl. Does it work? Yes. Well? Very well. Regardless, I don't rely only on it, I always use the ebrake when parked. Pretty massive thought to trade in a car because you don't want to use the ebrake.
08-01-2016, 12:39 AM
#15
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I hate the taste of crow but it appears that the Mercedes engineers (or the Mercedes lawyers) agree with the belt & suspenders philosophy:
From the 2012 C63 manual:
Unintended vehicle movement can cause
serious personal injury or damage to the
vehicle or the vehicle drivetrain. To reduce
such risks, always do the following before
turning off the engine and leaving the vehicle:
I don 't know if I can teach myself to do this in an automatic. Sigh. Thankfully Houston is pretty flat and hills are pretty rare.
From the 2012 C63 manual:
Unintended vehicle movement can cause
serious personal injury or damage to the
vehicle or the vehicle drivetrain. To reduce
such risks, always do the following before
turning off the engine and leaving the vehicle:
- keep your right foot on the brake pedal.
- engage the parking brake.
- shift the automatic transmission to park position P.
I don 't know if I can teach myself to do this in an automatic. Sigh. Thankfully Houston is pretty flat and hills are pretty rare.
08-03-2016, 10:59 PM
#16
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I think we could find a few things in the manual that we are supposed to do and don't, and aren't supposed to and we still do. Not using the parking brake may be the least egregious of the bunch.
08-05-2016, 10:09 AM
#17
In an environment when there are dozens of posts of people willing to spend insane premiums so that the fuel or lubricant they are buying for their car is 2% better than the cheaper alternative, not making use of free & simple insurance like the use of a parking brake seems silly. The cost/benefit analysis would say that there is virtually no cost to its use, but a potential for a huge safety and durability benefit if you might have been one of the unlucky few to have a failure that results in transmission damage or your vehicle rolling into something.
Last edited by looney100; 08-05-2016 at 10:12 AM.
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BLKROKT (08-05-2016)
08-05-2016, 02:23 PM
#18
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In an environment when there are dozens of posts of people willing to spend insane premiums so that the fuel or lubricant they are buying for their car is 2% better than the cheaper alternative, not making use of free & simple insurance like the use of a parking brake seems silly. The cost/benefit analysis would say that there is virtually no cost to its use, but a potential for a huge safety and durability benefit if you might have been one of the unlucky few to have a failure that results in transmission damage or your vehicle rolling into something.
08-05-2016, 04:51 PM
#19
Super Member
FYI, every Mercedes uses a mechanical drum brake inside the hat of the rear rotor for the parking brake. They do not mechanically activate the rear caliper to use the disc service brake also as the parking brake. This would appear to alleviate any concerns regarding rotor warping caused by brake pad clamping against a hot rotor.
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zcct04 (08-06-2016)
08-05-2016, 09:45 PM
#21
BTW, The newer MBs with the electric parking brakes engage automatically when the engine is shut off.
08-05-2016, 11:31 PM
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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
In an environment when there are dozens of posts of people willing to spend insane premiums so that the fuel or lubricant they are buying for their car is 2% better than the cheaper alternative, not making use of free & simple insurance like the use of a parking brake seems silly. The cost/benefit analysis would say that there is virtually no cost to its use, but a potential for a huge safety and durability benefit if you might have been one of the unlucky few to have a failure that results in transmission damage or your vehicle rolling into something.
08-08-2016, 01:09 PM
#23
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2012 C63 AMG DP
My question was mostly due to the fact that it did not have this behavior before the rear axle swap, and I am trying to trouble shoot what happened.
08-08-2016, 01:11 PM
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2012 C63 AMG DP
Again. Yes. Ive owned many many cars.
This issue is a new development, and I understand that car roll is expected from time to time - but I wouldn't post this unless it was Excessive... as in far greater than the normal amount expected.
This issue is a new development, and I understand that car roll is expected from time to time - but I wouldn't post this unless it was Excessive... as in far greater than the normal amount expected.
08-08-2016, 01:14 PM
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2012 C63 AMG DP
Automatic transmissions have a parking pawl that engages a gear to hold the car when in park. Sometimes the pawl engages into one of the detents on the parking gear, other times it hits the top of the gear tooth. When this happens, there is a small spring that pushes the pawl into the gear, but it can't engage until the car actually rolls a little ways. If you listen carefully you will hear a click as the parking pawl engages the gear.
But you said it rolls excessively. If the car moves more than 6 inches before you hear the click and it stops the car, I'd get the car looked at.
But you said it rolls excessively. If the car moves more than 6 inches before you hear the click and it stops the car, I'd get the car looked at.
My greater concern here is that it did not do it the 6 months before the shop replaced a rear axle and it has done it daily since.
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