My 300cd has had an issue for a while. I've addressed it again and again but it just doesn't want to be easy. The brakes on my car have been dragging off and on for months. I've replaced the master, all calipers, rotors, all flex hoses, all pads and adjusted the parking brake to a tee (I had to replace the front cable....someone was asking about this earlier...there IS a front cable on w123's haha! They're hard to pin down on the typical online parts databanks). However when I push the brakes in for a hard stop and then hit the throttle, the pistons won't pop back and it drags hard in the front end (from what I can tell). When the wheels are up, all 4 spin freely...but the usually start with the pads at least touching a bit. When the calipers are bottomed out, there is a tonne of room even with fat new pads so I'm thinking they should be pulling back more. I can play with them a bit while I'm on the road and they'll back off enough to make it not much of an issue for daily use but I've been dying to free her up completely. I'm going to rebleed the whole system this afternoon and flush/replace the fluid incase some grit is the culprit. I was thinking it may be a vacuum boost issue though as well. I'm not to familiar how the booster facilitates the release if it does at all. I want to think they should pull off even with the car shut off.
Anyodd, any advice would be muchly appreciated! Cheers!

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'81 300D,'83 300CD-T, '82 300TD

We've got heads on sticks, you've got vantriloquists.