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This happened to me when I put a new master cylinder in there. The brand I bought had its piston too long which covered the brake return hole in the cylinder so it just kept bringing up the pressure. So I returned it, got a different brand and was good to go.

Since you had this problem with the original and now new cylinder that SHOULDNT be the case. Try unplugging the big vacuum line that goes from the intake manifold to the brake booster and drive around again. If the brakes don't lock up its the booster.
 
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