98 5.2 4x4 About 2 months ago i replaced my front rotors and pads. Everything has been fine, now all of a sudden the break pedal goes right to the floor, it is still stiff before I start it, its still full of fluid, and I did check the rears when I did the fronts and they were fine, im going to double check the rears and fronts right now. Any help on what else may cause this? There is NO pedal at all. thanks

 

hmm. just found some posts under dakota with the same issues pointing towards master cylinder, should i start there? btw i forgot to mention i havent seen any leaks either

"If you don't see any visible leaks then the only likely place is at the master cylinder. Since it is not low on fluid it isn't likely leaking out the back of the master cylinder either so it probably is internal."

 

First check for leaks. Check it over REAL good.

Next I would say it is the Master Cylinder, however please be advised, if you replace it you must bench bleed it first before you install it to help to keep any air from getting into the ABS pump. The only way to get it out is using a DRB-III tool on the ABS Module to electrically open all the valves in the pump. A dealer will have one, and posibly a big local garage. You could try to replace it, bench bleed it, then wheel cylinder bleed it and HOPE any air comes out.

 

thanks hydra, so i need a DRB-III tool to even take it out? or is that used to bleed the system?

 

no you don't need it to remove the master cylinder, he was just saying that using the DRBIII would be the only way to ensure all air is out of the system, by opening all the valves in the ABS pump, and allowing you to bleed the brakes until theres no more air in the system if you replaced the master cylinder. thats why he said to bench bleed the master cylinder, it gives you the best chance at keeping air out of the system, without paying someone to do it by using the DRBIII, if you have access to a DRBIII for free though i'd use it.

 

thanks for clarifying