2012 Prius - New Calipers, Pads Still Dragging (hot brake discs)

Ok, this is bad. Replaced seized rear calipers with new Raybestos, new discs, new pads, changed the fluid, bled it. The rear still drags. The right rear has a 1/16" (edit: at most, I over reacted with the first value) blue ring at the inner side of the disc from high temperature.

What could be wrong? Bubbles on the line? The parking brake line pulling - is that possible , is it even adjustable ?

 

Thansk ASR, looking for it now.

 

SO - I opened the dashboard at the left of the steeringwheel and adjusted the nuts outwards by maybe 1/8" in total. No change.

I have to grab the right-left rotor with by two bolts with two hands. Rotating front it sticks occasionally and it's hard to rotate. Going backwards, no sticking, and hardly rotates. I know it should rotate, scrape a bit but move freely.

EDIT: rotor spin - mine ain't like that, way harder, need two hands

My mpg went from 5.5l/100km to about 7; at least that is a strong tell tale sign. At times it drops towards a 5.5-6l/100 after 50-70 km if driven in the same day. Gonna go bleed the brakes and see if that helps. Post ideas if anything pops in ur head.

 

I think I got it - but not 100% sure. I bled the rear brakes again and there were a few bubbles coming out. After that it felt as if the wheel was a tad bit looser.

However I noticed something bad: the wheel is free for the most part but it sticks in certain points 1 or 2 spots when moving it "forwards" by hand using a bolt. The backwards rotation seems to has no such sticky points. Could it be warping? The disc is tilted? I'd like to believe it's some old rust underneath making it sit uneven. I think I should take it off and clean the hub better?

EDIT: I forgot one thing. The caliper wasn't moving along the pins - I think it was the bubbles. But I forgot to check it after to see if it's loose after I bled it. I only tried the rear right one. It couldn't be seized, it's new, lubed with silicone grease.

Also, what's the surest way to ensure that there's no bubbles left in the system. When I changed

 

Hey Mendel: yes I greased with AGS sil-glyde, everything is new and I made sure the piston was rotated like that with the cube and whatnot - you guys were diligent about letting me know about that (awesome forum!).

I had one issue during the uninstall - a caliper leaked and at some point the liquid got low in the reservoir and I wasn't sure if I got air in or not. I pumped minutes/hours cycling fluid in closed circuits (without any line being able to suck air in) until I saw no more bubbles and making sure the liquid never went low in the reservoir. I had an assistant pressing the brake and I must have cycled a 1 to 3 quarts in this process, of course reusing fluid - I don't even know, I cycled hoping any stuck bubbles would come out. At times there were very few fine bubbles but I said I'd let the system sit and bleed them in a week or so (that was now). So that's why I narrow it down to bubbles as one of the potential main culprits.

My dad cleaned the rust off the rotor with steel wire brushes and a drill - it looked good. So I'm not sure if that disc would have a chance to sit slanted so not sure about the stickiness that I mention.

Other than that, things look great; I have no further clue of anything being broken. Thanks for the clip - I'll hoist the wheels again and give it a spin tomorrow.

 

They're not re-manufactured according to the website "Unlike traditional calipers, Element3 calipers by Raybestos feature all new components, combining optimal performance with time-saving, trouble-free installation." BUT, I wouldn't rule out the possibility of having a defect caliper.

As for 1, when I took them off and put them back I saw under the rubber boots that the line is dowsed in some grease o some sort. I'll go over the repair instructions but I doubt it.

For 2, when I installed I rotated them and I thought I paid careful attention for one of those Vs to open downwards to hug the pin - gain, I'll take a look just to be sure .

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QUESTION: Could too much of that sil-glyde cause any issues? When I installed I rubbed and pressed and made sure there's no vacuum and whatnot ... but I'm wondering.

 

Unhinging it at the caliper?

 

Btw I've already tried this when bleeding. I think it loosened up the wheel, and after bleeding it stayed like that. But still sticking like I said. I dropped my folks at the train station this morning and the mpg seemed to have improved - but it was freezing (felt like 10F or worse, the car got warm very slowly), I'm not sure how much more fuel I would burn in these situations. Let's see what happens when I unhook the parking line.

Thanks guys . I'll wait a day or two to wait for the weather to get warmer and I'll come back with results.