Join Date: Nov 2003
Location: Houston Texas USA
Piston may be stuck in caliper bore
"Calipers are new. Pedal is still bit spongy, thinking about bleeding them one more time. I did around 20-30 turns CW on outboard adjusters...nada. Left inboard worked, the rest 3 could not move."
Sound like the brake pistons are sticking in their bores, again a common problem. The rebuilt calipers on the market now aren't very good, the pistons are very prone to sticking.
First of all make yourself a little chart of which way to turn, which adjuster, to make the pistons move in and out.
Now take out the brake pads. See if you can get the right inboard piston to move. If you can, move it back and forth (using the adjuster) until it moves easily in both directions. If the piston refuses to move....then you have to remove the caliper, take it apart, pull the pistons from their bores, and grease them with super high temp brake lube. This should have been done by the !!**/^ who rebuilt them the first time.
On the outboard adjuster, it's important to maintain a heavy pressure, pushing in on the adjuster as you turn the Allen key. If you're just lightly turning the Allen key it's easy for the friction drive inside the piston just to spin without moving the actual piston.
On this board you can exploded diagrams and pictures of the diabolical mechanisms inside the caliper pistons, this may give you some insight on why work/ don't work.
Finally to ATE who designed and built these things, Damm you, Damm you to Hell
Hope this helps.