I have a 1999 Jimmy that i bought a few weeks back. The brakes go all the way to the floor to stop and even then they are not full brakes. I changed the pads and the master cylinder. I am having the same issue. I did have the brakes bled by a friend but this did no good. They were bled the old school way not sure if you have to bleed a different way but any help. Thanks

Are the rear brakes ok and adjusted properly( drums I assume). Also if the system was run out of brake fluid at one time the abs must be bled, that requires a high line scanner.

The rear brakes are disc, but when i first tried to bleed them the rear brakes didn't even work , there was alot of air in the system but from normal bleeding there is straight fluid coming out and there are no leaks. What is a high line scanner and can i do it myself or should i take it to a shop. Also the rear brakes are working now but the pedal goes all the way to the floor. When the truck is turned off though it will build pressure.

did you bench bleed the master cyl before you put it in
http://autorepair.about.com/od/fixityourself/ss/MC_bench-bleed.htm

did you bench bleed the master cyl before you put it in
http://autorepair.about.com/od/fixityourself/ss/MC_bench-bleed.htm

Good point I always assume everyone knows to do this, the abs must be bled with a scanner that can actuate the abs solenoids to purge trapped air.