HELLO GUYS
UPON HAVING WHAT I SUSPECT WAS A BAD MASTER CYLINDER I WENT TO AUTOZONE AND BOUGHT A NEW ONE.TODAY I TOOK THE TRUCK TO MY, AS OF TODAY,EX MECAHNICTO CHANGE IT.ALL WAS WELL BUT AFTER ABOUT 5 MIN. OF DRIVING THE BRAKE PEDAL STARTED GETTING HARD AND THE TRUCK LOST ALL POWER AND FELT LIKE IT WAS DRAGGING A TRACTOR TRAILER BEHIND IT.I SMELLED SOMETHING LIKE ASBESTOS OR A CLUTCH SMELL AND STOPPED IT INMEDIATELY.I CALLED MY EX MECAHNIC AND TOLD HIM THE SITUATION AND HE TOLD ME TO BRING THE TRUCK THE FOLLOWING WEEK TO INSPECT IT ,SOME NERVE!ANYWAY AFTER SOME WHILETHE TRUCK COOLED OFFAND I STARTED IT AND IT RAN FINE BUT AFTER A FEW MINUTES THE SAME THING HAPPENED.WHAT CAN IT BE ?I NOTICED ALSODURING THIS TIME IT IS HARD TO GET OUT OF PARK AND THE PEDAL IS SUPER HARD.THANKS IN ADVANCE.

 

The rod from the booster to the master cylinder was not adjusted properly cause the brakes to rag and fail.

 

Bingo Mike, a classic "line lock" situation due to the fluid being unable to return to the reservoir as a result of the master cylinder not "returning" properly from its stroke.

 

EXACTLY WHAT YOU GUYS SAID.ACTUALLY AUTOZONE DISPATCHED THE WRONG MASTER CYLINDER.ANYWAY MY OLD ONE HAD A 1 YEAR WARRANTY WITH ATLANTIC BRITISH AND WAS EXCHANGED AT NO COST.TRUCK UP AND RUNNING AGAIN.ONCE MORE THIS FORUM HAS PROVED TO BE PRICELESS!THANKS AS ALWAYS AND HAPPY HOLIDAYS!