Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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The most common cause in allot of cases with the brakes either not engaging or staying engaged is a fault with the brake master cylinder itself or the anti lock brake hydraulic unit.Both of these can fail/act up and cause issues like this here needing replaced.The brake system will need tested further to locate which is the cause here and from there repaired to correct this fault.
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