Brake pedal pulse abs buzz. W211

[atlantimd]

Hi just wondering has anyone come across this issue. The car has new pads rear and front are good and no warped discs. Intermittently while braking the pedal feels like the ABS is activating and the pedal occasionally pulses back against foot pressure.
I car soft data shows wheel sensor data and driver front looks irregular at times.

Front brakes have that creaking sound when parked and pressed also

That’s for any info on this

 

[EmilysDad]

Rusty reluctor rings? But I'm aware that not all Mercs seem to use them for their ABS.

 

[Doug1234]

Metallic pads and ceramic mix , one type front and the other on the rear confusing the ABS due to different pad grip rates.
Have had this on a w210 when I fitted ceramic to the front and had metallic pads on the rear.

 

[atlantimd]

Rusty reluctor rings? But I'm aware that not all Mercs seem to use them for their ABS.

Can these be cleaned pulling of disc and hub or replacement?

 

[atlantimd]

Pads are all the same brand and type

 

[EmilysDad]

Can these be cleaned pulling of disc and hub or replacement?

Reluctor rings, if fitted tend to tust to the point that they either split or such that the ABS sensor has trouble seeing the indivual teeth. Replacement rings are generally available on the Web.

 

[atlantimd]

Eventually months later failed abs ring in Right rear so cheers Emilysdad
Hope this helps others