Hey everyone, I opening someone can help me out here. Just recently did rear brakes and axles bearings and seals. After the job my brakes felt good but almost as soon as you hit the brakes the petal will vibrate or shutter and make a buzzing sound coming from the drivers side of the engine bay, im assuming where the abs unit is. It will vibrate and make the buzzing sound for a second and then once it stops the brakes get a little bit softer but not completely gone. We bled all of the brakes after the job and I don’t have an ABS light popping up on the dash. Any ideas?

 

That's as if the ABS is being activated when it shouldn't be, which I don't pretend to understand. The light is triggered by the system not working, which doesn't seem to be your problem.

I can only suggest, at least as a starting point, disconnecting each rear sensor in turn & seeing what, if any, difference that makes.