Question about 2002 Audi A4

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Rear break abs pulsation after changing the rear breaks

What do you think is the problem?

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  • zina_39120 Dec 14, 2008

    I changed the rear break and the rotor and the bearings. I had to also change a caliper becauce it was frozen the other one was ok a little hard to get back in but it suceeded.I bleed the lines rr,lr,rf,lf in this sequence. The only other thing that i could think that could cause this is the sensor or the ring which had to be taped off the old and tap on the new. There were no problems taping the ring on and off everthing went on stright. oh one other thing there was alittle rust on one of the new rotors .Or maby i got some oil on the rotors ,but i used break cleaner.

  • zina_39120 Dec 14, 2008

    wow, this can happen to bran new rotors? but the pelal is not vibrating though the hole stoping ,just when i come to a compleat absolute stop like the abs is kicking in.Foe example i apply the breaks and the fell great then when I come to a stop sign and i wont to stop sudenly the fell fine right to the very end the pulsintion and the noise of the abs pump comes on.Like the car thinks i am in a looking situation. do you thick the other caliper is looking up?

  • zina_39120 Dec 14, 2008

    ok found he problem it was the abs sensor was pulled half way out after cleaning and placeing it back the car beaks great.I also sprayed the break rotors with break cleaner there was a little grease left on the rotor from my hand I guess i did not clean the enough.I drove the car all day and no problems at all. :)

  • zina_39120 Dec 14, 2008

    I am a tec also , I just could not figure this one out.I knew it was not and out of round rotor because there was no pulsation aas i was slowing ,just when i had a sudden stop,like it was preventing skiding, like it is supossed to do. thanks for your help .



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I think you have a rotor that is out of true. Take them off and get them trued up at your local auto parts store. ABS problems will turn on the warning light so I doubt that would be the problem. If the pedal is nice and hard I would say you bled them right. Good luck.

Posted on Dec 14, 2008

  • Howard Lester Dec 14, 2008

    It can happen with new rotors.It's all about how they are stored. This is how we in the biz confirm if we have a warped rear rotor/drum. Drive the car on a dry road. Put the car in nuetral and SLOWLY apply the parking brake. As the car starts to slow down you will feel the pulse if the rear rotor is warped. If no pulse you have other things going on.

  • Howard Lester Dec 14, 2008

    I am happy it was cheap and you found it.



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