Had to change out the rear wheel cylinder went ahead and change both. Changed the brakes as well. Flushed all the brakes lines several times over went thru 4 bottles want to get a good flush. Bled them the two person method then the gravity method. Still had spongy pedal. Like I read earlier had same problem as other people. truck turn off brake felt great truck on lose pedal feel. Took to firestone tried to have them bled the brakes. They said master cylinder was leaking possible truck has 116000 miles on it. So they changed out master cylinder sat up there for about 5.5 hours still got spongy pedal play. Any ideas?????

 

have the shop perform an automated system bleed with a full function scan tool.

 

Cool thanks I believe I seen those the fill up the brakeys system from the farthest bleeder back to the master cylinder but what will the scan tool tell me have no engine codes light

 

air may be trapped due to the abs pump. an auto system bleed will cycle the abs pump valves.