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Had brake lines replaced to ABS unit. Now, the brakes on all four wheel lock up

(2004 Chevrolet Suburban 1500)
in Paramus, NJ on November 18, 2013
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?
Displaying 1 answers & 1 comments
Popular Answer
of G. T. Service Center on November 18, 2013
Have the ABS autobleed function done with someone who has a Tech2 scan tool.
on November 22, 2013
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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