trying to get outside to see if there is air in RABS.its 101 here today and that pavement is smoking hot

 

So I bled the rabs and all the breaks again and it is no better.

 

did you test the RABS?


can also pinch the rubber lines with a clamp to isolate an area, just don't squeeze it too hard

 

okay i am totally stumped....bleed the brakes along with RABS 6 times not including les schwab doing a full flush.checked the RABS so many times that the nut is almost stripped.the master cylinder has no rust or leaks and all bleed valves and fittings are tight and not leaking yet my foot still goes to the floor very easily!!where the hell do i go next?i literally am towing a 13k trailer in a few weeks.i also have no dummy light on which is weird ?

 

try pinching the rubber lines to isolate the area?

 

just did that...nothing different.must be the master cylinder...crap

 

If you isolated it then that could be your issue.

 

okay i put in a new master after bench bleeding it to death.installed it and bleed all the lines and RABS in order....twice.still the same...petal to the floor while truck is running but not when off!so i got to ask because i have always had an assistant pump the brakes till hard and then hold,release the bleed valve on the caliper,have me till me they are holding when it hits the floors,tighten bleed valve as their are holding to the floor,tighten valve and then have them pump.i do all this while i have a tube connected to the nipple and the other end in clean brake fluid.i am seeing i **** ton of air coming from the front in the tube,but not on the rear brakes.no matter what i do i cant get it to bleed off!everything is tight and i have absolutely no leaks to be sucking air.

my neighbor advised me to do the same bleed procedure but instead of pumping brakes and holding,bleeding off and then tightening and repeating.he said i should hook up a hose from bleed valve to fresh container of fluid,open bleed valve and just pump until there is basically no air then do the bleed procedure i was doing before.thoghts on this???

 

Check this out:

https://www.ford-trucks.com/forums/1...l#post13491110

I saw this in the Excursion section when I was researching bleeding the brakes on my Ex. Obviously with Photobucket sucking out, the photos are longer up.

Red

 

thats it!!! i am throwing in the towel and taking it into the shop tomorrow.did hours of work to get the air out of this thing to no prevail!

 

Are you losing any fluid at all? Is it possible you have a line leaking?

 

not a freaking drop! Been over this thing 100 times its. completely solid besides losing the brake pressure

 

Thread Continued Here- https://www.ford-trucks.com/forums/1...l#post17313893