I have a 99 ram 1500 4x4 with rear abs 360 automatic the brakes seem to work fine under regular stopping but when I have to stop fast and push the pedal hard and fast it is almost like you don't have any brakes I have almost hit the person in front of me a couple of times it has new brake lines hoses rear wheel cyl. pads everything is good anybody have any ideas what would cause this? thanks in advance for any help

 

How does the pedal feel when that happens?

Welcome to DF!

 

when you really have to come down on the pedal to make a fast stop the pedal feels like it is going to the floor and it will just barely stop you I have bled the brakes several times because I thought it had air in them tried sliding the wheels in gravel and in grass and nothing seems to help.

 

also no lights showing

 

Your rear brakes could need adjusting.

 

Disable the rear dump valve, (unplug it.) See if that solves the issue.

 

heyyou tried unplugging the dump valve today had no effect on it still like you don't have any brakes when you stomp on them.thanks.

 

If you stomp on it time after time does it begin to build pressure or continue to go straight to the floor?

 

doesn't build up any I have about 1/2 to 3/4 pedal normal driving but when you have to stop fast and stomp on pedal it goes almost to the floor and will barely stop you scary in traffic.

 

Sounds like a bad seal in the master cylinder to me, google the symptoms of a master cylinder seal leak and see if its similar.