Hey guys. First post but thanks for all the knowledge here. I just picked up my S with 230000 miles. It's running like a champ besides the below issue.

My problem is that my rear brakes continue to drag after 6000 miles. There is little to no wear on the new rotors. Basically, the rear brakes aren't working. There is a constant dragging noise as if the piston doesn't fully retract. The rears don't seize or anything like that, it seems as if the piston doesn't move at all.

Here is the break down of things changed.

-rear calipers changed with rebuilt ones
-new pads and rotors
-master cylinder changed
-rear brake lines upgraded to ss
-brakes have been bleed multiple times
-ebrake has been adjusted
-slider pins are greased

The strange part is, when I fully extended the rear piston and pushed it back in my rotors showed some wear. After that, nothing has changed. Is it possible to have 2 bad rebuilt calipers?

Any suggestions would be great.

Thanks guys and gals.

 

Just curious, did you orient the piston X groove with the pad? Doubt it's your problem but, possible to have 3 bad rebuilt ones who knows, I would verify while someone is pressing the pedal what is moving, Possible the pins are shot...we're they replaced too?, verify correct placement and mobility .

 

 

I made sure the pads were aligned with the caliper. The sliding bolts are greased and not sticking.

From what I noticed, the calipers worked after I brought them out and in for a short time. The rotor showed wear after I did this but the effects stopped shortly after. I still have cross hatched marks on my rotor.

I plan to take a look at my rears tomorrow to see if there is anything I missed.

Thanks for the suggestions.