1999 Jimmy Brakes go to the floor


jimmyhat
10-13-2011, 06:57 AM
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

maxwedge
10-13-2011, 01:12 PM
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.

jimmyhat
10-13-2011, 02:44 PM
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.

FishFind
10-13-2011, 04:19 PM
did you bench bleed the master cyl before you put it in
http://autorepair.about.com/od/fixityourself/ss/MC_bench-bleed.htm

maxwedge
10-13-2011, 07:37 PM
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.

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