STi_JL

i heard of the opposite way of this, lol
that it Gases to 50 km automatically lol
happen to my buddies old C class

ivan318

Hi Enrike,

Just would like to confirm the attached photo is the one you talk about. I had the same problem as you described and my mechanic told me to replace this. Tks.

edearcos

What is that?

edearcos

Have you had any problems with the brakes doing that anymore? I'm having the same problem and no one knows what to do! Also, how do we get Mercedes to do a safety recall on this problem?!!! It's scary!

Enrike

Ivan 318 that is indeed the Yaw Rate Sensor

and so everyone knows, I have not had the problems I had before ever again. Changing the Yaw Rate Sensor fixed the problem...

later

slik560

Thanks for the very timely update. I am trying to purchase my first ML, and I was looking at both a 2001 and a 2003 ML320. Since it seems the yaw sensor problem was a 200-01 issue, it makes the choice a lot easier!!! The o1 is at the MB dealer, so maybe I can work a deal to have them replace the sensor if I buy the car.

d2ml320

I've had the same thing happen to me. Originally replaced the brake light switch and then braking happened again. When I took it into the shop (private) the ODI showed faulty fuel level indicator, faulty map code and O2 sensors. I replaced the first two items and the O2 cleared out. The very next day out of the shop the car stopped dead in its tracks again. The technician did not find any codes what so ever, so I will look into the Yaw sensor mentioned above. If anyone else has experienced this condition or can offer any suggestions please post.
thanks,
d2ml320

Enrike

This is really insane. I've had lots of people contacting me over the past few years since I started this thread, asking me questions about the very same things I experienced. I just hope there isn't people out there who didn't get a chance to post because they got involved on an accident. If anyone out there knows of a way to change the title of the thread so it is easier for people to do a search and find this thread I'd appreciate it. I don't think the title is helping people with "sudden braking" find this very helpful thread... FYI I'm still driving my ML320 and have had no problems ever since I changed the Yaw Rate Sensor.

leealoha

I have owned my 1998 ML320 since new. At 72,371 miles the right front brakes dragged severely to the point the car was pulling right and the pads smoking. Replaced all parts, calipers, rotors, pads on both left and right front. Did everything dealer recommended.

Same problem occurred again yesterday at 81,895 miles. No indicator lights either time. This is dangerous.

Car has been dealer maintained on schedule since new. Please help me figure out problem, as dealer cannot figure it out.

Maj. Dundee

Usually the caliper is at fault, but the brake hose on that side must now be changed.

What happens is the interior wall of the hose swells and the pressure from the master cylinder is enough to push the fluid through, but the retracting caliper does not have enough pressure to force the fluid back up.

Notice that they had some sort of problems with these hoses, probably a manufacturing defect.

Jamie007

Hi...
I drive an ML320, 2000 model. I was doing 80kmh on a main freeway in Melbourne Australia a couple of weeks back, and my front right brakes applied themselves while my foot was on the accelerator.. It pulled me to the right and stopped me within about 30m.. The car behind me swerved and just missed me. I just thank god it was a public holiday so not a lot of traffic.. I also am thankful a truck wasn't behind me..

I read this thread and went out and purchased a 2nd hand Yaw rate sensor for $300 delivered.. It took me 15 minutes to replace.. I also read they need to be calibrated so I took it down to my local Mercedes mechanic and he did it for free... He scanned my car and I was relieved to see the code C1120 N64 (ESP Yaw Rate sensor) Stored..
But I also had a code C1000 N47-5 (ESP,SPS,PML and BAS Control Unit) code Stored.. Its a ESP/BAS module that is black and sits under the washer fluid bottle. Ineed t get the part number (if anyone knows it that would be great) as I want to price a 2nd hand one..
Ive had oil leaks and power steering fluid leaks and the mechanic said I will need to replace that unit because some fluid may have got into it.
Im a bit sceptical as these two codes seem to have come up together.. I asked if the Yaw rate sensor failing could cause a fault code in the BAS module.. He said he doesn't think so.. I would think it absolutely could..
Anyway Im gonna drive it and see how it goes.. I've booked in to have all the leaks fixed and the fan belt replaced..
This problem should be recalled.. Its the most dangerous thing that's ever happened to me on the road and I'm very lucky to still be here... When you have no cars in front of you and your car just pulls up suddenly, the people behind you haven't got a lot of time to react.. Its like driving behind someone and they slam on their brakes for no reason..

I've fixed 3 other problems with my car since I've had it..
When I 1st bought it the BAS/ESP lights would come on and when ever i did a left hand turn at slow speeds, my front wheel would grab as I was turning.. That was a Lateral acceleration sensor.. It sits near the Yaw sensor under the centre console. Takes about 15 mins to replace and is a plug n play...

My car used to not get out of first gear sometimes, or it would stutter up the road.. I'd have to turn the engine off and restart it... That was the mass air flow sensor.. Another easy Plug n play fix..

The other was a Crank shaft sensor.. My car just stalled at the lights for no reason and wouldn't start.. That part is under the hood and easy to replace once you locate it.. About 10 mins work and another plug n play...

Lets hope the Yaw sensor fixes my problems as I plan on towing a boat in the next few weeks..

Thanks for the informative posts guys.. Its certainly saved me tonnes of money over the years..

DrX

To avoid confusing future readers of this thread, module N47-5 is the ESP/BAS control module, an electronic part inside the engine bay fuse/relay box. The black unit under the washer reservoir is the ABS pump, a hydraulic part.

Code C1000 usually means you need to replace the N47-5, not the part under the washer reservoir.

Welcome to the forum.

Jamie007

Cheers.. But just to clarify what my mercedes mechanic said...
He said that the ESP/BAS pump has a module on the front of it which needs replacing... That is what he said the N47-5 fault was.. He showed me what needs replacing and showed me it was under the water reservoir on the back of the ESP BAS pump..
From what I understood he said the relay "could" be the issue so to be safe he swapped it with my central locking relay to see if it keeps faulting.. But he is convinced i will need to replace the module on the front of the ESP/BAS pump with the code that came up...
Personally I dont think I will have to replace it.. I think that code came up when my Yaw sensor faulted...

DrX

I'd have to say that the explanation your mechanic gave you is incorrect. The electrical unit attached to the front of the ABS pump is commonly called the "solenoid pack" and has its own set of codes (ranging from C1300 to C1319 as shown in the attached pdf).

As none of these codes were set, it is unlikely that the solenoid pack (A7/3) is faulty.

When reading these tables, the right-hand column lists either the test needed or the part that requires replacement.

This linked page explains about the solenoid pack and how you can send it to the USA for repair for a flat fee of $100 + shipping. --> http://www.modulemaster.com/en/servi...des_motors.php

The problem you have described doesn't need a recall. It gave you the ESP/BAS warning light and stored the codes - these should have been properly read and the faults rectified in order to avoid the sudden braking incident you experienced.

Jamie007

Thats great thanks for your explanation... In your opinion, by replacing the Yaw sensor, that should fix the sudden braking problem? And could have that sensor fault also sent a fault code of n47-5 once the brakes had applied and the bas esp lights came on?

Ive located the module.. Its a big silver box behind the fuse box.. What fuses/relays are associated with this box??

The code C1000 doesnt show in that pdf file.. I think it starts at C1010 which describes what to do if the voltage is too high or too low..

Cheers.

DrX

(post deleted - quoted below)

Jamie007

I notice a lot of people refer to the solenoid pack as the BAS ESP module. Even the people who refurbish them call them a module. It makes it very confusing.. One mechanic on another site talks about the traction control unit and then says its under the water reservoir. BUt I take it thats the same unit you say is behind the Fuse box.
You are the only person that has said that the codes I got refer to the unit behind the Fuse/relay box. . So thanks for that. Saved me a lot of time and money buying a new solenoid pack .
Ive purchased the unit you said but wont replace it unless the codes show up again.. I got it for $130
This unit is out of the exact model and year (and even colour) as my car. Are they a plug and play or do they need to be programmed / calibrated?
Thanks in advance..

Maj. Dundee

Just to clarify things.

From 1998-2002, the ESP/Traction Control Module is housed in the fuse/relay box.

From 2003 on, the same module is attached to the ABS Hydraulic unit.

Please UPDATE YOUR PROFILE in USER CP.

DrX

Technically the solenoid pack contains a control module (for the solenoid valves) and the unit is a traction control unit - a hydraulic one. So these terms are correct. It's probably better to specify the MB number to avoid ambiguity.

It's a complicated system, with several control units & modules. If you're interested in details, read this pdf --> http://www.mercedestechstore.com/pdf...2002-25-04.pdf

(Please stop quoting everything I write - it makes the thread twice as long. )

Jamie007

Im tipping my mechanic thought he was looking at a later year car then or just got mixed up.. As when I rang him and said I purchased a module and that it was silver, he said the Module should have a yellow plug and was black.. He had pointed to the module attached to the pump when he showed me what needs replacing and he said I could do it.. It was just a plug and play.... Anyway, Its cleared it up for me so thanks to you both..
If the control module in the solenoid pack faulted, it would show codes from 1300+ from what DrX said.

I wont quote anymore and have updated my details..

Cheers.

Maj. Dundee

What is this reference to "yv"?

Jamie007

You've both...

Maj. Dundee

Do us all a favor and spell things out.

DrX

I don't know why you wouldn't go ahead and replace your faulty N47-5, having already bought it. Do you need another random one-wheel braking episode to convince you it's bad?

It doesn't need programming. (but if I'm wrong, I'll be corrected)

Maj. Dundee

If it's used it's a plug and play. But the codes in the donor module must be read and erased first.