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02 Chevy tahoe lt 5...
 
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02 Chevy tahoe lt 5.3 v8

  

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After about 20 mins of driving all four brakes lock up along with pedel getting rock hard 


4 Answers
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all of a sudden? gradually over time? Was any work done on it recently?


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Please add more details. How, when?, condition of vehicles etc. Anything relevant.


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If this happened sudden like, check the brake fluid for contamination with oil or some other petroleum based product.


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Only time I had that happed to me was when I installed a master cyl and i did not adjust the pump rod free play.  locked up the hydraulics....probably does not pertain in your case though...


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