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Q: Had brake lines replaced to ABS unit. Now, the brakes on all four wheel lock up on 2004 Chevrolet Suburban 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
error for stability control comes up. Mechanic has bled lines several times but same thing happens once you press brake pedal.
Any ideas for fixing problem?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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It turns out that hydroboost unit had a leak and because rear seal in master was no good, power steering fluid was being pumped into master cylinder. The rubber in master swelled up and lines to calipers open under pressure but collaping and not releasing.
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