I replaced all of my brake,..all the lines rotors calipers master cyl. everything whole 9 yrds.. for the moment i have my rear brakes pinched off.. my problem is for some reason i have a spongey pedal and it slowley settles to the floor and the abs brake light will come on for a sec, then instantly shut off again.. from my experience soft pedal means air.. ive ran a good 2 bottles of fluid threw with no progress... and a pedal that slowly falls means a leak... but i have all new everything with no brake residu any were... could this be casue by not haveing rear brakes?? the truck gave me this problem when i first bought it but eventualy settled it self but now its been like this for sometime now.. its actually a little scary to drive.. im allout of ideas could it be a vaccum problem?.. its is a std. master and booster!.. i do not have a hydraboost syst.. any input???... Thanks

 

Did you install the calipers on the right sides so that the bleeders are on top, I know most people know this but there was a guy on here having problems and that was the problem. How do you have the rears blocked off ? is it possible fluid is getting by ? I'm sure I don't need to tell you thart blocking of the rears isn't the safest thing

 

yeah it was last resort i ran out of brake line and so did the parts depot!!.. unbelievable i know!!! but yea bleeders on top, blocked the rear off right at the dist. block on the driverside frame rail rite near the tire simply screwd a plug in...

 

Well if there's air in the line goin to the back that could explain the spongy pedal. Pull the line off at the master cyl and block it there.

 

deff a great idea!.. Its on my to do list for the am. Ill let you know how it turns out... should only be a few more days untill i get some line in. Thanks!!

 

well im still having the same problems front and back brakes are in, Everything is bled out but the pedal is still soft and goes to the floor.only when the truck is on if the truck is off the pedal gets hard as a rock, as soon as you turn the truck on it sinks and goes soft!! idk what it could be everything is new!!.. could the booster be bad? any ideas?!!

 

Sounds like it could be a booster