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H2 2004 hummer ...while driving on the freeway the brake lock up on me and I saw a smoke coming out from drive back rear under from tire area. so I try to put it on reverse and then forward ...did not go...waited and pray after 30 minute I try backing up and it move and try going forward it went I didn't reach home so I wait for 1 hour and try it again and I made it home. someone says to let all 4 brakes air out for 1 hour then bleed it good and took it for a drive on freeway and brake lock and h2 didn't want to go I almost got hit from rear and pulled over and called the tow to tow me home. every now and then I can drive around the block but can't go more then 20 mph I try it and it feels like the brake is locking up again....please help...

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Posted on Jan 02, 2017

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SOURCE: rear brakes

take it to a shop and let them scan the computer and see if any codes come up.

Posted on Nov 08, 2008

  • 1392 Answers


Sounds like a problem with the proportioning valve. Try not to push the pedal down to far when bleeding. The valve sounds like it is getting stuck closed, and takes a little bit to release and allow fluid to pass again.

Posted on Jun 10, 2009

  • 10319 Answers

SOURCE: Back Driver side tire locks up when moving

remove the rear wheels and inspect the braking system. something is loose or has been bent to stop you truck

Posted on Feb 06, 2010

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