new front disk brakes lock up.....

BigBlockMopar said

Pushrod between brakepedal and MC is too long. Keeps fluid from going back into the MC.

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X2 Figure out if it's really a pressure problem or not and whether it's the master or valve.

So first lock them up, and determine that you can release pressure and calipers at the valve, then try the same thing but release the line at the master