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What causes auto braking on left or right turns

(2007 Mercedes-Benz ML350 4MATIC)
in Ponchatoula, LA on January 07, 2019
On my 2007 ML350 4Matic, I have had new rear brakes (fronts fine), new brake sensors on right side, ABS Speed Sensors replaced on front and rear (all four), yet when turning right or left, the brakes engage if I depress the gas pedal, and no brake engagement if I don't apply the gas pedal. This is very difficult in traffic, and needs to be addressed. Yet it drives forward and in gentle curves just fine, although the ESP flashing triangle appears while taking deeper curves. How can I stop this dreaded scraping/braking noise and issue? There are no Dash Light Messages or Trouble Codes showing at all. Please help...
What seems to make the problem better or worse? While making a hard left or right
How long have you had this problem? Since the new ABS Sensors were replaced
Tags: mercedes benz, ml350 4matic
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2 answers & 12 comments
Popular Answer
on January 07, 2019
Indicative of wiring harness or connector failing while front wheels are being turned.

Intermittent failures are common.
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on January 07, 2019

Professional scan test is invaluable!
on January 08, 2019
Thank you so much. What should be done to correct it? Are the wiring harness or connector failures corrected with replaceable parts?
on January 08, 2019

First a scan test must be preformed to locate the exact failure area - left or right.. May include test drive with scanner connected.

Then with vehicle hoisted - a visual inspection - *hands-on* evaluation should confirm failure.

This is not likely a diy repair.

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on January 08, 2019

(Yes - replacement parts available)
on January 08, 2019
Wonderful! Thanks so much! Have a spectacular day!
on January 08, 2019
Thanks again!
on January 09, 2019

Too much conflicting information concerning this issue .. Only recommendation is enlisting assistance from a professional Mercedes Benz technician.
on January 10, 2019
I'm uncertain what seems to be in conflict within my written description of the issue. Thanks for trying to assist. I am grateful.
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on January 07, 2019
Indicative of wiring harness or connector failing while front wheels are being turned.

Intermittent failures are common.
Sign in to reply
on January 07, 2019

Professional scan test is invaluable!
on January 08, 2019
Thank you so much. What should be done to correct it? Are the wiring harness or connector failures corrected with replaceable parts?
on January 08, 2019

First a scan test must be preformed to locate the exact failure area - left or right.. May include test drive with scanner connected.

Then with vehicle hoisted - a visual inspection - *hands-on* evaluation should confirm failure.

This is not likely a diy repair.

▪️ https://repairpal.com/repair-shops ▪️

on January 08, 2019

(Yes - replacement parts available)
on January 08, 2019
Wonderful! Thanks so much! Have a spectacular day!
on January 08, 2019
Thanks again!
on January 09, 2019

Too much conflicting information concerning this issue .. Only recommendation is enlisting assistance from a professional Mercedes Benz technician.
on January 10, 2019
I'm uncertain what seems to be in conflict within my written description of the issue. Thanks for trying to assist. I am grateful.
on January 07, 2019
Your key clues here are ESP flashing light -- this is your traction / stability control system showing a problem. This is directly related to your ABS system. My guess is you have a concern with the ABS sensors, rings, wiring, clearance, or other related issue. Were you having any problems before the repairs were performed? Why did all those parts get replaced?
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on January 08, 2019
Thanks so much DaveJM! Yes, the initial problem was Brake Wear and Brake Wear Sensors. I had the Rear Brakes replaced, but didn't realize that the Brake Wear Sensors had to be replaced at the same time, thus the Trouble Code Light on the Dash kept reading "Brake Wear." Next, The vehicle began automatically braking whenever I attempted to move it above 9 mph, because the ABS Speed Sensors needed to be replaced as well. I had all 4 replaced, in addition to replacing the Brake Wear Sensors (right side only on this vehicle), and all Trouble Codes were cleared by the Mechanic, which remedied the issue driving forward, but then began having this scrubbing/braking when make a left or right turn (only if depressing the gas pedal in the turn. It immediately releases after the turn is complete, and everything moves smoothly. I thought that I could have possibly gotten faulty ABS Speed Sensors, but when placed on the Computer, all 4 Sensors move at the same speed, and seem to be functioning correctly. In addition, the issue DOES NOT occur while driving with the Diagnostic Trouble Code Computer attached, but returns as soon as the Computer is detached. It seems that I am so close, but cannot figure out this mystery. Any ideas or directives will be greatly appreciated.
on January 08, 2019
Addendum:
The automatic braking did not occur immediately after the brakes were replaced. It was about a week or so later. Also, I intended to say the "All 4 wheels move at the same rate of speed, not all 4 sensors, when viewed on the Diagnostic Computer Screen. I'm sorry for not being clear. Thanks again for any directives and assistance in advance.
on January 08, 2019
Sensors for the wear indicators do need to be replaced, along with pads and rotors for best results. Just replace it all. But the ABS sensors should not need to be replaced due to normal maintenance of brake pad replacement, making me wonder about the quality of the parts or the workmanship. And now that you have replacement sensors, you have more variables going on here.

I'd use original equipment Mercedes-Benz pads, rotors, wear sensors and put your old ABS sensors back on and see how it works if it was my car. If all parts are currently original equipment Mercedes-Benz parts, then testing needs to continue. Something isn't checking out with your story verses your concern. Good luck!
on January 10, 2019
Thanks so much for trying to help me. I'm sorry if my written details were not coherent enough to follow. Yet I thank you kindly anyway.

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