PSA: Vibration Both Under Braking Accelerating in Steering Wheel

nevetstoj · 03-28-2024, 07:09 PM

Hello all,

Just thought I would share a finding in relation to Reluctor rings on the axels and the ABS unit.

Symptoms: Vibration under braking and driving at speed, Random DSC kicking in

So I had previously used a washer and spaced out the wheel speed sensors in the rear when I got the car. Seemed to fix the random traction control intervention.

I had noticed recently that my steering wheel would shake at around 80kph with both brakes applied and just driving in a straight line. No codes at all with my scan tool. Also, the car would have what felt like trouble tracking in a straight line. I had checked the front arms, but everything is fine and there was no play.

I just summed it up to the winter wheels im on having lost a weight. HOWEVER, recently I was reading about the dsc module and the dtc mode (one click) and tested a theory. That being, if I drive around with dtc mode on, would the car overlook spastic variations in speed readings. Thus eliminating the vibration I was feeling both on the brakes and coasting?

YES, yes it did.

So, if anyone else out there has mysterious vibration they can not find after eliminating worn control arms, wheel and tire balance, look at your wheel speed sensors. I guess the car was getting inconsistent readings from the wheel speed sensors and varying the application of brake pressure in attempt to keep the car in a straight line, both on and off the brakes.

Cleaned all the wheel speed sensors and replaced one that had been making contact with the axel.

No more vibrations.

Hope this helps someone!

MAMSport · 04-06-2024, 11:44 PM

Interesting. I'll check out the wheel speed sensors. I get vibration under braking from 40+ mph, felt in the steering wheel.

nevetstoj · 04-08-2024, 04:15 PM

Quote:

Originally Posted by MAMSport

Interesting. I'll check out the wheel speed sensors. I get vibration under braking from 40+ mph, felt in the steering wheel.

Hopefully it works!

MAMSport · 04-23-2024, 09:34 PM

going to have my indy check the suspension pieces out tomorrow. BMW CCA undercarriage tech session local to me. The upgraded parts now have over 80k miles and may be showing some wear?

03-28-2024, 07:09 PM	#1
nevetstoj Private First Class 143 Rep 113 Posts Drives: 2008 128i Join Date: May 2021 Location: Toronto iTrader: (0)	PSA: Vibration Both Under Braking Accelerating in Steering Wheel Hello all, Just thought I would share a finding in relation to Reluctor rings on the axels and the ABS unit. Symptoms: Vibration under braking and driving at speed, Random DSC kicking in So I had previously used a washer and spaced out the wheel speed sensors in the rear when I got the car. Seemed to fix the random traction control intervention. I had noticed recently that my steering wheel would shake at around 80kph with both brakes applied and just driving in a straight line. No codes at all with my scan tool. Also, the car would have what felt like trouble tracking in a straight line. I had checked the front arms, but everything is fine and there was no play. I just summed it up to the winter wheels im on having lost a weight. HOWEVER, recently I was reading about the dsc module and the dtc mode (one click) and tested a theory. That being, if I drive around with dtc mode on, would the car overlook spastic variations in speed readings. Thus eliminating the vibration I was feeling both on the brakes and coasting? YES, yes it did. So, if anyone else out there has mysterious vibration they can not find after eliminating worn control arms, wheel and tire balance, look at your wheel speed sensors. I guess the car was getting inconsistent readings from the wheel speed sensors and varying the application of brake pressure in attempt to keep the car in a straight line, both on and off the brakes. Cleaned all the wheel speed sensors and replaced one that had been making contact with the axel. No more vibrations. Hope this helps someone!
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04-06-2024, 11:44 PM	#2
MAMSport Second Lieutenant 87 Rep 265 Posts Drives: '13 128i M-Sport coupe Join Date: Apr 2016 Location: North Shore of MA iTrader: (1)	Interesting. I'll check out the wheel speed sensors. I get vibration under braking from 40+ mph, felt in the steering wheel. __________________ E9x M3 front & rear suspension arms; BMW Performance brakes upgraded to drilled rotors in rear; BMW performance shifter; BMW Performance Exhaust; Wave Trac LSD with modified 'nannies'; BMW Euro Intake box; BMW Aluminum Strut Tower bar; ECS front and rear sway bars; 3 stage intake with BPC software; BMW style 78, 17 x 8" wheels with Bridgestone RE 980AS 225/45-17 tires; Koni Special Active struts/shocks, E9x M3 RTABs.
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04-23-2024, 09:34 PM	#4
MAMSport Second Lieutenant 87 Rep 265 Posts Drives: '13 128i M-Sport coupe Join Date: Apr 2016 Location: North Shore of MA iTrader: (1)	going to have my indy check the suspension pieces out tomorrow. BMW CCA undercarriage tech session local to me. The upgraded parts now have over 80k miles and may be showing some wear? __________________ E9x M3 front & rear suspension arms; BMW Performance brakes upgraded to drilled rotors in rear; BMW performance shifter; BMW Performance Exhaust; Wave Trac LSD with modified 'nannies'; BMW Euro Intake box; BMW Aluminum Strut Tower bar; ECS front and rear sway bars; 3 stage intake with BPC software; BMW style 78, 17 x 8" wheels with Bridgestone RE 980AS 225/45-17 tires; Koni Special Active struts/shocks, E9x M3 RTABs.
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