Chengny. thanks for the response. Did a GEN III swap in my truck so this is new condition basically. I drove the truck for only a short time before starting the swap and the brakes were fine. I had some leaks at new fittings but no leaks now.......finally!! I was thinking that maybe it is the "new" MC that I put in that might have a very small leak around a seal internally. I thought of doing the standard two man bleeding to force the liquid instead of gravity. Thanks again for your thoughts as well as the other members.
So the condition began only after doing the engine change - correct? Any other changes made during the engine swap?
You mention this:
I had some leaks at new fittings but no leaks now.......finally!!
Does that refer to leaks at the brake fittings - ones that only developed after you changed all those brake parts you mentioned? Or does it mean vacuum leaks associated with the new engine?
Also, does the pedal go low with the engine running and the truck is stationary - or does it only happen when the truck is being driven?
Finally, if you started having this issue after the new brake parts were installed - is it possible the calipers are on the wrong sides? Do they look like this (i. e. with the bleeders at the top)?
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They can fit on either side. But if they are reversed the bleeders will be at the bottom of the piston cylinders - and the calipers might not bleed properly. A pocket of air can possibly remain up top.