abs&e. brake lights comeing on

[#1toycrawler]

Hey guys
New here and having some trouble with my 1993 f350 cc 4x4 td. Have had a problem with the abs and emergency brake light coming on and off for the past couple of weeks. Then a few days ago while towing a 24'little pontoon boat across the desert the rear brakes decided they didn't want to release. I was able to loosen the lines at the master to release the pressure and free them up so I replaced the proportioning valve today in hopes of at least curing the rear brake problem but I've read that the abs and e brake lights may be due to a faulty air pump? Alls the fluid looked like puke so im flushing everything with brake cleaner as I go . Could the problem with the lights allso be due to the proportioning valve being bad? Any thoughts greatly appreciated.

 

[f-two-fiddy]

You should post this in the IDI section. You'll get more visibility.

A lot of times what happens is the rubber brake line from the frame/axle will fail internally. Then the fluid only flows one way.