Gentlemen, could someone please provide some help :

I have a 1999 ML430 with only 20K miles.

I has on three occasions had the front brakes on both sides start dragging and experienced a loss of power.

After letting it set over night the brakes no longer drag.

It has at times had the BAS/EPS light comes on.

After letting it set over night the light goes out.

The most recent time I took it to the local MB Dealership and they tell me I need a YAW Rate Sensor MB#163-542-16-18.

I found the part at a discount MB dealer for $187.50 and placed the order. Within a day of placing the order MB comes out with a new part#163-542-23-18 and the price goes to $363.00.

In my searching of the various ML forum no one has reported a YAW Rate Sensor problem. I therefore think something else wrong.

I have replace the brake light switch and also had the brake fluid purged and replaced by the local MB dealer.

Does anyone have a suggestion of what may be the problem ?

Can someone post a MB WIS for replacement of the YAW Rate Sensor and or tell me where it is located on the ML.

Thanks, Charlie

That Yaw rate sensor is a VERY low fail part..sold only 1 this year..they do fail


Located on the "tunnel" behind the gear-shifter beneath the window switch assembly.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
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27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Sooooo, what exactly is the purpose of the Yaw Rate Sensor when functioning properly? And why would it apply brakes when malfunctioning?
Just want to know.

__________________
Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport

Yaw(rate) was a boating term for years. For MB's that term emerged in 1996 here is the USA.. means that the car speed isn't equal to the steering wheel angle VS the wheel speed of each wheel.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

M.B. Doc

Thanks for your comments.

Is the YAW Rate sensor replacement a straight plug and play DIY.

In other words disconnect battery, locate sensor, un-plug old and plug in new, and reconnect battery.

Or does it require some re-programming by the MB computer ?



Thanks again Charlie

Just plug & play...no battery dis-connect needed.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator