Ive replaced


rotors
calipers
hoses
proportioning valve


ive bled it 500 times. front end was redone months ago and everything is tight. ive learned to live with it.

 

How's the front end alignment?

 

Perfect actually. I can drive on straight road and play the piano if i wanted too.

 

mine does this couple times a month...never could figure it out totally.
i have replaced calipers all around (needed too) ...i can drive for weeks and then it will do it once...i let up on pedal then reapply the brake and is fine for another week.
it started last year...i thought maybe some new pads (love them lifetimes) and still no change...about a week later it did it again.
i have had it aligned...shocks are new (with lift kit)

just learned to live with it for now.

i have also been told to check the rubber lines for swelling or weakness....which i prob should do this summer.
i have never changed them soooo that may be my problem right there.

 

Passenger caliper going bad or try bleedling the lines starting from the furthest from the master

 

Center your foot on the pedal.

 

ABS? When you bled it, did you cycle everything with a GM Tech2 (Assuming ABS). I don't know about the ABS systems specifically on the Blazers, but I've seen a couple cases where there has been a restriction in the ABS unit, or it had air in it that would cause similar issues. You could rig up a couple pressure gauges and see what kind of pressure you are getting at the calipers, that would be a big indicator.